#linuxcnc | Logs for 2012-03-30

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[00:00:09] <Valen> a battery pack designed as the primary motive power in a car/whatever is often called a traction battery
[00:00:32] <Jymmm> silly aussie!
[00:01:06] <Jymmm> 90Ah eeesh
[00:01:08] <Valen> its from old stuff, like a traction engine
[00:01:12] <Valen> http://www.evworks.com.au/index.php?product=BAT-LFP200AHA is a bigger one
[00:01:23] <Valen> but most people seem to use 90 or 160's
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[00:01:36] <Valen> they have a 2000Ah one for subs, but not through this reseller
[00:01:37] <Jymmm> That be a fun flashlight
[00:02:31] <Jymmm> no weight listed =(
[00:02:49] <Valen> they feel like a block of plastic
[00:02:58] <Valen> lighter perhaps
[00:03:11] <Jymmm> ah
[00:03:20] <Valen> weight is listed on the 90ah
[00:03:22] <Valen> 3.3kg
[00:03:30] <Valen> 7.9 for the 200
[00:03:40] <Jymmm> I guess I'll stick with my 18650's for now.
[00:03:50] <Valen> touch more spendy
[00:04:26] <Jymmm> Yeah, but more things are using them, I can find battery holders for them, etc.
[00:04:59] <Valen> you generally build a frame for these batteries, they come with screw terminals that take M8 bolts as i recall
[00:05:14] <Valen> thats one cell keep in mind
[00:05:17] <Valen> 3.6V 200Ah
[00:05:18] <Jymmm> Valen: I got one of these for $10USD and it has an 18650 in it =)
[00:05:24] <Jymmm> http://www.amazon.com/Sony-CP-ELS-Portable-Charger-Battery/dp/B005XJWS30
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[00:09:20] <SolarNRG> Why do some stepper motors have 6 wires and some have 8 wires, what is the difference?
[00:09:43] <djdelorie> "the wiring" duh :-)
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[00:10:11] <djdelorie> there are four coils in a stepper, eight wires. Sometimes, wires are combined internally to save on external wiring
[00:13:05] <SolarNRG> So on my little stepper motor, red and green go to +5v, the other 4 must be fired in sequence
[00:13:29] <djdelorie> assuming red and green are the commons, probably
[00:13:37] <SolarNRG> With my BIG stepper motors, does this mean 4 of them go to +24v and still four are fired in sequence?
[00:14:02] <djdelorie> if they're split out you have more options. You *could* connect them that way, or use an H-bridge
[00:14:26] <SolarNRG> I'm guessing because you're using higher voltages and currents an H bridge might be sensible
[00:14:49] <SolarNRG> But I discussed this idea and an H bridge made from TIP BJTs would be slow compared to a gecko drive
[00:14:55] <djdelorie> an H bridge lets you use all the coils all the time, doubling the torque generated
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[00:17:51] <SolarNRG> Thanks for your advice
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[00:26:13] <Jymmm> H Bridge? Are you serious? I'd use a 90 degree phase offset I bridge instead
[00:28:52] <djdelorie> it's a stepper, you should use an S-bridge ;-)
[00:29:36] <djdelorie> Or, to make a long story short, you could use an A-bridge
[00:30:04] <Jymmm> For stepper, you really ned an L bridge
[00:32:22] <Jymmm> as in london
[00:33:13] <djdelorie> avoid those, they keep falling down
[00:33:48] <Jymmm> Ah, yes, good point!
[00:36:48] <SolarNRG> Could I make my own "gecko" drive
[00:36:58] <SolarNRG> dj, ur pretty good with pcbs
[00:37:10] <djdelorie> you could, but what's the point?
[00:37:23] <SolarNRG> cheaper
[00:37:31] <djdelorie> unlikely
[00:37:32] <SolarNRG> I don't want a chinese board
[00:37:41] <SolarNRG> everyone tells me they smoke, not much else
[00:39:59] <Valen> cheaper until you blow stuff up and take your time into account
[00:40:48] <SolarNRG> Can you make your CNC machine do the mario theme?
[00:40:56] <SolarNRG> http://www.youtube.com/watch?v=Kh2AWswAMvw like this
[00:41:10] <djdelorie> probably, the PWM for the motors is well past human audio range
[00:41:59] <SolarNRG> How can you turn a midi into stepper motor music?
[00:43:52] <Tom_itx> http://www.synthgear.com/2009/strange-weird/midi-stepper-motor-music/
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[01:14:22] <Jordan__> would it be stupid for the motor to move?
[01:14:39] <Jordan__> instead of using a belt system?
[01:14:55] <Jordan__> so the motor moves itself along the track
[01:45:07] <Jordan__> anyone got anything against acetal gears?
[01:46:35] <Jymmm> Other than a pipe cutter, is ther eany other cutting tool like a can opener?
[01:46:39] <Jymmm> any
[01:49:59] <Tom_itx> jaws of life
[01:50:21] <Tom_itx> tin snips
[01:50:23] <Jymmm> More hand tool
[01:50:33] <Jymmm> needs to be rotary
[01:50:40] <Jymmm> like a can opener
[01:50:55] <Tom_itx> paper cutter
[01:51:30] <Jymmm> What I need is a hand can opener that will leave a about 1/4" lip inside the lid.
[01:51:37] <Jymmm> err the can that is
[01:51:53] <Tom_itx> i think you can buy them
[01:52:03] <Jymmm> I have to find them first
[01:52:09] <djdelorie> nibbler?
[01:52:25] <Jymmm> djdelorie: too fugly of a finished cut
[01:52:42] <djdelorie> you want to get the food out, leave a pretty edge, and not be standard?
[01:53:00] <Jymmm> I never said anythign about food =)
[01:53:12] <djdelorie> mount the can in a lathe ?
[01:53:32] <Jymmm> it'll crush it, and no lathe
[01:53:55] <djdelorie> is there food in the can?
[01:54:06] <Jymmm> no, empty.
[01:54:15] <djdelorie> *can* you put something in the can?
[01:54:26] <Jymmm> sorta
[01:54:28] <djdelorie> I'm thinking, fill it with fluid, freeze it, and use a forstner bit
[01:54:44] <djdelorie> you need something behind the metal to push against
[01:54:47] <Jymmm> Ew, I just tried a step bit, not a pretty sight
[01:54:55] <djdelorie> a wheel cutter might work
[01:54:58] <Jymmm> swarf everywhere too
[01:55:06] <Jymmm> wheel cutter?
[01:55:13] <Jymmm> like a can opener?
[01:55:50] <djdelorie> http://www.rockler.com/product.cfm?page=11196
[01:56:09] <Jymmm> oh gawd no
[01:56:18] <Jymmm> I dont want Any swarf
[01:56:29] <Jymmm> I have one of those btw
[01:57:23] <djdelorie> cnc laser ? ;-)
[01:57:38] <Jymmm> I have one of those too, but it dont cut metal
[01:58:57] <Jymmm> this is a comercial can opener http://www.costco.com/Browse/Product.aspx?Prodid=11490617&whse=bd_827&Ne=2286%204000000&eCat=bd_827|11113&N=4007132&Mo=298&No=9&Nr=P_CatalogName:BD_827&Ns=P_Price|1||P_SignDesc1&lang=en-US&Sp=C&topnav=bd
[01:59:04] <Jymmm> bbiab
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[02:18:30] <Jordan__> is there not supposed to be any pressure on the rack and pinion gears? are they supposed to kind of float together
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[02:52:29] <mozmck> Jordan__: some of the ones I've seen use a spring to keep the pinion pulled tight against the rack.
[02:53:31] <mozmck> I guess it also would allow for a less than perfectly straight rack over a long distance.
[02:55:06] <Thetawaves> is there a way to set maximum duty cycle on a pwm output?
[02:55:56] <Thetawaves> i want to use a 170v power supply to run a 100v motor, this should be possible with proper filtering and not more than 58% duty cycle
[02:57:39] <Thetawaves> any comments as to if this is even a good idea
[02:58:43] <Thetawaves> could there be glitches where the pin may accidentally be held high?
[02:58:56] <pcw_> asplode!
[02:59:21] * Thetawaves would like to run 100v motor without spending 500$ on a 100v power supply
[02:59:54] <djdelorie> Thetawaves: the motor will still see 170v part of the time, if the insulation isn't rated for that, it might short
[03:00:07] <Thetawaves> not if you filter properly
[03:00:46] <Thetawaves> a pi filter should do a pretty darn good job at eliminating the transients
[03:01:01] <pcw_> Brush motor?
[03:01:10] <Thetawaves> i understand your concern and will make sure when it is built
[03:01:12] <Thetawaves> yeah
[03:01:27] <Valen> generally it'll be ok, though you may see more arcing
[03:01:57] <Valen> might put an additional inductor in the line and a condensor cap
[03:02:23] <Thetawaves> before the filter?
[03:02:32] <Thetawaves> a pi filter is a series of capacitors and inductors
[03:02:49] <Valen> to make the filter
[03:03:00] <Thetawaves> ahhh yeah, thats the plan
[03:03:28] <Valen> put an inductor in the line, the motor itself is an inductor
[03:03:41] <pcw_> you dont want a PI filter (capacitor input)
[03:04:10] <Valen> putting a cap across the terminals of a motor can help reducing arcing
[03:04:15] <Thetawaves> pcw_, you advise against first leg in the pi filter?
[03:04:45] <pcw_> Yes you cant drive a capacitor with a PWM source
[03:04:57] <Thetawaves> huh?
[03:06:19] <Thetawaves> the simplest filter is a resistor + capacitor
[03:06:35] <Thetawaves> that is the usual way to smooth a pwm signal
[03:07:18] <Thetawaves> that is the younger sister of LC based filters though
[03:07:43] <pcw_> The current in the capacitor will by C dv/dt and dv/dt is very high for the square wave edges
[03:07:48] <Valen> Thetawaves: if your feeding a motor PWM you need to look at whats actually going on and what cares about the voltage
[03:08:38] <Valen> the windings in the motor are the most sensitive, however the voltage across them is going to be nice and smoothed do to the motor itself being a huge inductor
[03:08:51] <pcw_> inductor input will work but I suspect you are better just lowering your power supply voltage
[03:09:05] <Valen> the brushes may see full line voltage, this can cause excessive arcing
[03:09:19] <Thetawaves> pcw_ how do you lower your power supply voltage?
[03:09:23] <pcw_> (the current is smoothed, not the voltage)
[03:09:37] <Valen> putting a small cap across the motor can help to quench the arc
[03:09:47] <Thetawaves> Valen, if you produce a filtered signal, there will be no 170v transients reaching the motor
[03:10:04] <Thetawaves> in essence we are saying exactly the same thing
[03:10:22] <Valen> I'm saying I'd run it without any filtering and a small cap across the motor
[03:10:40] <Thetawaves> NOW YOU"RE TALKING SCARY
[03:11:20] <Thetawaves> i think these motors burn through brushes fast as it is
[03:11:22] <Valen> I often run low voltage motors at 4x their "rated" voltage ;->
[03:11:26] <pcw_> how big a motor?
[03:11:31] <Thetawaves> 300w
[03:12:08] <pcw_> 170V is rectified/filtered line voltage?
[03:12:18] <Thetawaves> will the additional arcing cause the brushes to deteriorate?
[03:12:23] <Thetawaves> faster*
[03:12:29] <pcw_> yes
[03:12:29] <Thetawaves> pcw_, yeah
[03:12:39] <Valen> yeah arcing is bad mmkay
[03:12:44] <Thetawaves> then i would much rather design the system to work at lower voltages**
[03:13:17] <Valen> I say try it and see what it looks like
[03:13:18] <pcw_> also the ripple current will be higher at a given PWM frequency
[03:13:36] <pcw_> what is the PWM frequency?
[03:13:48] <Valen> arcing is a product of voltage, current and RPM (not the simple product though)
[03:14:07] <Thetawaves> what frequency can i produce on the parallel port?
[03:14:18] <Valen> ok, thats not going to work then lol
[03:14:42] <Thetawaves> think i can produce 5khz?
[03:14:43] <Valen> 300W motor 3Khz or so would be the minimum PWM frequency I'd use
[03:15:16] <Valen> note thats PWM frequency, at low duty cycles the effective "frequency" can be much higher
[03:15:36] <Thetawaves> the entire goal of this little thought exercise is to get away from writing code on one of the avr to produce fast pwm
[03:15:47] <Valen> use a hardware PWM port
[03:16:30] <Valen> 3Khz at 256 levels of PWM means a minimum pulse is equivalent to 768khz
[03:16:31] <pcw_> also you will only have about 10 steps of PWM from aparallel port (3+ bits)
[03:17:06] <Thetawaves> alright, my hopes are crushed
[03:17:26] <pcw_> thats a little beyond what software pulsing (from a PC) can do
[03:17:50] <pcw_> use an arduino
[03:17:53] <Thetawaves> do you get more resolution if you reduce the frequency?
[03:18:00] <pcw_> yes
[03:18:42] <Valen> pcw_ you should be telling him to use mesa boards ;-> they will do PWM at stupid fast speeds
[03:18:54] <pcw_> but the ripple current will get out of hand
[03:19:23] <Thetawaves> mesa won't work because my atom computer's pci slot is already occupied
[03:19:41] <Valen> if its not occupied with mesa it could be put to better use ;-P
[03:19:42] <Thetawaves> ...or i could replace it
[03:20:07] <jdhnc> I have a mesa 7i43 on my Atom parallel port
[03:22:47] <pcw_> or if you are just poking about, run the motor from a safe voltage and use software PWM and see how you do
[03:23:19] <Valen> whats the motor for?
[03:23:22] <Thetawaves> spindle
[03:25:14] <Thetawaves> simplest sounds like using an avr to convert the low speed pwm from the computer into higher speed to run the igbt
[03:26:48] <pcw_> if its a spindle why not just use the AVR to control it and send serial/modbus/analog/ whatever from LinuxCNC to set the speed
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[03:32:31] <Thetawaves> serial would be the easiest
[03:33:40] <Valen> I'd also look at using one of those hobby brushless motors
[03:33:44] <Valen> and controllers
[03:34:16] <Thetawaves> back to using parallel port, no serial port
[03:35:32] <Valen> many of the itx boards have a serial port, its just on a header
[03:35:43] <Valen> also for that application usb > serial would do
[03:35:58] <Thetawaves> ahh yeah, i'll open it up and take a look
[03:35:59] <Valen> (heck use a usb AVR + lufa and you don't even need another item)
[03:36:15] <Valen> just usb > avr > pwm out
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[03:36:35] <pcw_> someone on th mailing list (maybe Kirk Wallace?) had a bit banged SPI comp for the parallel port as well
[03:36:42] <Thetawaves> i actually have most of the parts to do that
[03:36:57] <Thetawaves> would have to make a pcb for the smd avr chip though
[03:36:59] <Valen> (don't use v-usb ;->)
[03:37:24] <Thetawaves> it has been on my to-do list to make a usb avr work
[03:37:27] <Valen> ahh well i better head out and do some work
[03:37:36] <Thetawaves> thanks
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[04:32:43] <ssi> http://a1.sphotos.ak.fbcdn.net/hphotos-ak-ash3/553744_819270538822_71107655_35511698_1208677495_n.jpg
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[05:05:31] <cradek> ssi: nice knurl!
[05:05:36] <ssi> thx :D
[05:05:49] <cradek> what is it?
[05:05:56] <ssi> hnc drill bushing blank
[05:06:31] <cradek> oh 5/8 to random drill size?
[05:06:34] <ssi> yeah
[05:07:03] <ssi> working on a program to churn them out
[05:07:16] <cradek> what a pain! I have a jacobs chuck mounted.
[05:07:26] <cradek> I have a few of their drill holders too, but they're so finicky.
[05:07:37] <ssi> I'm gonna mount a jacobs chuck also, but I don't have one on there yet
[05:08:43] <ssi> I'm a bit worried about the overall length of a jacobs chuck plus a typical drill bit
[05:08:52] <ssi> especially getting up in the 3/8" to 1/2" range
[05:09:10] <cradek> yeah I always use ... uh whatever the short ones are called
[05:09:14] <cradek> screw machine drills
[05:09:17] <ssi> ahh
[05:09:37] <cradek> for me they're usually better for everything
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[05:22:37] <Jymmm> WOOHOO! tinder tubes done and work nicely =)
[05:28:41] <cradek> what's a tinder tube?
[05:36:20] <Jymmm> cradek: Watch this real qick, then I'll tell you 012-03-28 10:29:21 Jymmm: TML: FWIW, this works GREAT!!! http://www.youtube.com/watch?v=-6FNCS7de_A
[05:36:25] <Jymmm> bah
[05:36:29] <Jymmm> just the video
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[05:39:56] <Jymmm> cradek: see it?
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[06:32:23] <DJ9DJ> moin
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[06:53:23] <Loetmichel> mornin'
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[09:59:30] <mazafaka> evenin'
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[11:55:08] <asdfasd> I have a lathe with spindle controlled by step/dir signals, is it possible to configure emc2 to use it as rotary axis and same time as spindle and control the RPM witn step/dir?
[11:56:39] <cpresser> asdfasd: that would give you two conflicting inputs?
[11:57:17] <asdfasd> inputs?
[11:57:25] <cpresser> but you might use two different 'configurations' for your machine, one 'spinde' and one 'axis'
[11:57:42] <asdfasd> no I need both together
[11:57:59] <cpresser> waht if you set "G0 X10 A20 S1600" (speed 1600, move to 20degrees). how is that going to work??
[11:58:04] <asdfasd> then with G code I will choose which one to control
[11:58:24] <asdfasd> Im not going to use that kind of G code
[11:58:36] <asdfasd> only M3 s1000
[11:58:43] <asdfasd> or only G0 A100
[11:59:05] <cpresser> how does the software know which command to follow?
[12:00:14] <cpresser> you could wire this up in hal with a mux to switch between the two options. but personally i think this is bullshit. two conflicting input options are not a good idea
[12:01:19] <asdfasd> it is not such bullshit, currently working with mach3, spindle and axis A configured on same outputs, I write the G code manually to avoid all conflicts
[12:01:30] <frysteev_> anyone have a machine with mulriple spindles i wonder?
[12:02:01] <asdfasd> so working good, but I like emc2, it is making more smooth movements
[12:02:11] <cpresser> thats why i wrote 'personal opinion' :)
[12:03:03] <asdfasd> ok, can you help me, how to do that, I dont really understand hal
[12:03:17] <asdfasd> I tried to read something but it is new for me
[12:03:26] <cpresser> you need to solve problems like 'reindexing the axis after it has been used as spindle', its not an easy task
[12:03:50] <asdfasd> I dont use houming on A axis
[12:05:01] <cpresser> take a look at the "mux2" module. it has two input signals and one output (plus a signal to control which input is used)
[12:05:57] <asdfasd> first of all I didnt found how to control step/dir spindle
[12:06:23] <cpresser> pwmgen? http://www.linuxcnc.org/docs/2.5/html/hal/rtcomps.html#sec:PWMgen
[12:06:23] <asdfasd> there is only outputs for spindle on/off CW and CCW
[12:06:52] <cpresser> am.. meant stepgen. sorry
[12:07:45] <cpresser> you can use the halui- and motion pins for that
[12:08:55] <cpresser> the pins "motion.spindle-speed-out" tells you how the programmed rpm
[12:09:38] <cpresser> "halui.spindle.runs-forward" tells the direction
[12:09:52] <cpresser> take those pins and hook em up to a stepgen
[12:10:01] <asdfasd> wow
[12:10:13] <cpresser> http://linuxcnc.org/docs/html/man/man9/stepgen.9.html
[12:10:53] <cpresser> stepgen has a velocity mode suitable for this usecase
[12:11:59] <asdfasd> ok, I understand now, still not clear, but now I have what to read, thank you very much
[12:12:24] <asdfasd> it looks like linux is always complicated :)
[12:12:51] <cpresser> its powerfull^^
[12:12:57] <asdfasd> much powerfull
[12:14:57] <asdfasd> recently I had a chat with cradec, for few settings, before I use mach3 on my mill, but I wanted to increase the feedrate, and I changed to emc2, much better movements
[12:15:33] <asdfasd> with same G code almost twice increased feedrate
[12:16:01] <asdfasd> now I think to change to emc2 on my lathe too....
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[12:35:18] <asdfasd> I think I found something
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[12:35:33] <asdfasd> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?KX3
[12:36:01] <asdfasd> the last example says ..... to add a 5th stepper generator controlling the spindle.
[12:37:12] <asdfasd> after changing that in my hall file should I be able to control the spindle RPM with step/dir?
[12:38:57] <asdfasd> is that the only I have to do?
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[13:11:19] <Tecan> anyone here laser ?
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[13:14:41] <frysteev_> i have lasers im working on getting operational..
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[13:17:29] <JT-Shop> you start raising the bar yet?
[13:17:46] <Valen> frysteev_: they had better be friikin lasers
[13:19:36] <Tecan> frysteev where does the wire go after it comes from the red wire to the tube ?
[13:20:30] * Tecan pokes frysteev_
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[13:26:28] <frysteev_> yo
[13:26:38] <frysteev_> to the exciter,
[13:26:58] <frysteev_> its going to be high voltage RF i believe,
[13:26:59] <Tecan> http://i.imgur.com/Hdpo1.png
[13:27:05] <Tecan> this is what im working with
[13:27:18] <Tecan> i know where to put the red wire
[13:27:28] <Tecan> but after that ide assume the ground
[13:27:34] <frysteev_> building one from scratch?
[13:27:37] <Tecan> ya
[13:27:49] <frysteev_> so you have the tube?
[13:27:53] <Tecan> ya
[13:28:03] <frysteev_> but no circuitry to drive it?
[13:28:17] <Tecan> i have a motor driver and pwm for the laser
[13:28:36] <frysteev_> the pwm would go to the laser driver,
[13:28:38] <Tecan> i just need to connect the end of the tube to something
[13:28:55] <frysteev_> the laser driver is what you need, to take the pwm and excite the tube
[13:29:07] <Tecan> yeah thats the power supply
[13:29:08] <frysteev_> not a homebrew item
[13:29:47] <Tecan> i bought the laser power supply, im trying to connect the tube
[13:30:03] <Tecan> where does the wire from the end of the tube go ?
[13:30:36] <frysteev_> im assuming this is an elcheapo china laser?
[13:30:41] <Tecan> mhm
[13:30:45] <frysteev_> (i have a 40 watt elcehapo one at home)
[13:31:00] <Tecan> i shoulda bought 80w for metal
[13:31:03] <frysteev_> i found it was cheaper to buy the whole thing, then buy the parts seperatly
[13:31:21] <Tecan> thats good an all im ready to go i just need to put this last wire somewhere
[13:31:31] <frysteev_> i will take a look at mine late and grab some pics for ya
[13:31:35] <Tecan> thanks
[13:32:15] <frysteev_> you have pics?
[13:32:48] <Tecan> my camera sucks, might try with the phone
[13:33:02] <Tecan> http://i.imgur.com/Hdpo1.png << this is the power supply though
[13:33:24] <Tecan> aha the laser tube circuit loop
[13:33:30] <Tecan> thats where the last wire goes
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[14:42:33] <ssi> HI
[14:42:41] <frysteev_> ola
[14:42:46] <frysteev_> are you here yet?
[14:42:50] <ssi> kentucky
[14:42:59] <ssi> I told you it was slow
[14:44:02] <ssi> you laserin yet?
[14:46:11] <frysteev_> hoisting it up tongiht hopefully
[14:46:16] <ssi> sweet
[14:46:17] <ssi> any new pics?
[14:46:56] <frysteev_> nope
[14:47:00] <frysteev_> ill be taking some tho
[14:47:11] <ssi> good
[14:47:18] <ssi> I wrote a program to cut drill bushings
[14:47:22] <ssi> it's working pretty well :D
[14:49:54] <frysteev_> for the lathe?
[14:50:29] <frysteev_> web gui done now too?
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[15:22:50] <ssi> yea for the lathe, and no, no web gui :)
[15:23:42] <ssi> and btw, this lathe can part like nobodys business
[15:23:43] <ssi> amazing
[15:24:01] <ssi> parting cold roll at like 8ipm
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[15:30:10] <Tecan> frysteev_ can i just tie the 5v to the signal to get the laser to fire ?
[15:30:44] <Tecan> its pwm so i'll be getting 100% power
[15:33:52] <frysteev_> um. not neccasarily
[15:34:12] <Tecan> im trying to test fire it and i put 5v to the in and 5v to the signal and nothing happened
[15:34:19] <frysteev_> if you were to do that i would only do it momentarily for quick tests
[15:34:52] <frysteev_> you have an arduino or soemthing that you can drive a pwm signal with?
[15:34:58] <Tecan> ya
[15:35:19] <Tecan> i duno what im doing though
[15:35:37] <Tecan> its asking for 2.2w to 5 w to fire the laser
[15:35:54] <Tecan> or pwm
[15:36:23] <frysteev_> my cheapo has a rest fire button right on it
[15:36:37] <Tecan> oh wait maybe mine does too
[15:36:41] <Tecan> theres a test thingi
[15:36:43] <Tecan> brb
[15:37:32] <frysteev_> http://megacyclelabs.com/?p=44
[15:37:40] <frysteev_> theres some pics of my cheapo
[15:37:55] <Tecan> sweet tits
[15:37:56] <Tecan> it worked
[15:38:02] <Tecan> burnt a hole in my dvd case
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[15:47:08] <Tecan> frysteev_ can you turn the laser really low to set the focal point ?
[15:47:17] <Tecan> so i dont set everything on fire
[15:49:29] <frysteev_> well on mine, you set the power control with the stupid pot, then there is a signal to turn the laser on or off, not pwm
[15:50:52] <Tecan> ew, so grey scale pictures are done with motion speed and hand controll ?
[15:51:07] <Tecan> that sounds tricky
[15:51:27] <Tecan> when you crank the pot way down can it hardly burn anything ?
[15:52:29] <frysteev_> there is a reason that project is sitting on a shelf atm,
[15:59:16] <Tecan> http://www.youtube.com/watch?v=Jm_6U-MWmXk << Vexare - Firing My Lazer
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[16:45:31] <cpresser> Tecan: most laser gray scale pictures are dithered (like in newspapers) and engraved with constant power
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[16:53:51] <IchGuckLive> hi all around the globe
[17:08:05] <Tecan> so what advantage would having control over it be ?
[17:08:21] <pcw_> IchGuckLive: was that you doing the giant foam statue?
[17:08:47] <IchGuckLive> yes
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[17:09:26] <IchGuckLive> therfor i made also the axis hack for xyuv foam view
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[17:26:31] <SolarNRG> Hi guys
[17:28:36] <DJ9DJ> Hi guy :)
[17:29:36] <ssi> SolarNRG: melted anything yet?!?!
[17:29:50] <SolarNRG> I want my arduino to drive a stepper motor with my PC 12v power supply, my stepper motor is a 439oz/inch or 3.1NM stepper it has 8 wires. What is the cheapest way to make the motors turn back and forth circuitwise?
[17:30:38] <ssi> SolarNRG: H bridge
[17:30:57] <ssi> but if you're not well versed in circuits, you're likely better off buying a commercial driver
[17:31:57] <SolarNRG> I built a BJT H bridge but it has two NPN 4Amp BJTs and two PNP 4 amp BJTs, I'm guessing this won't work and I need 4 BJTs all the same for steppers, am I righT?
[17:32:06] <SolarNRG> The H bridge I made was for a windscreen wiper motor
[17:32:19] <frysteev_> SolarNRG: you can buy 3 or 4 axis stepper controls cheap online
[17:32:38] <frysteev_> i got a funch of 4 axis ones, 2.4A per motor for like $60
[17:32:48] <SolarNRG> I'm thinking now of using my steppers to drive my solar dish instead of a CNC machine for now
[17:32:53] <SolarNRG> I only need a 2 axis one for this
[17:33:07] <SolarNRG> I can get more steppers if needbe, I think a CNC machine may be a few months away
[17:33:17] <frysteev_> http://www.cncgeeker.com/index.php?main_page=product_info&cPath=1&products_id=41&zenid=91d309d9fb0ddafddf82a4b6b40ccb0f
[17:33:36] <frysteev_> i have a few of those too, which i got cheaper buy buying like 5 of them
[17:34:38] <frysteev_> http://www.aliexpress.com/product-gs/357533544-5-axis-cnc-controller-TB6560-3-5A-stepper-controller-handle-controller-wholesalers.html
[17:34:47] <SolarNRG> Its not as nice as a gecko drive
[17:34:54] <Jymmm> Who needs a plasma cutter http://www.youtube.com/watch?v=kDxJVKymqY4
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[17:40:34] <mrsun> did he say lead ?
[17:40:42] <mrsun> or whatever its called in english
[17:40:44] <frysteev_> Jymmm: yours?
[17:40:49] <mrsun> vaporized i dont think its very healty
[17:41:00] <Jymmm> frysteev_: nah
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[17:44:34] <djdelorie> maybe it's a pencil lead, which is mostly carbon
[17:45:53] <djdelorie> SolarNRG: the easiest way is to wire the stepper as bifilar, and use four NPN (or better N-MOSFETS) driven by logic
[17:47:45] <frysteev_> the EASIEST way to drive a stepper is turning it by hand :P
[17:51:20] <SolarNRG> DJ, have you got a circuit partslist/schematic to make said ultra cheap-crap but operational device?
[17:52:30] <mrsun> http://www.youtube.com/watch?v=PMXEfDoH1ho&feature=g-vrec&context=G2e1cc6dRVAAAAAAAABg lets destroy a milling machine ? :P
[17:52:38] <mrsun> look at the column guideways ...
[17:56:26] <TekniQue> yeah that's not good for your guideways
[17:56:36] <TekniQue> the abrasive dust
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[18:05:22] <djdelorie> http://www.delorie.com/tmp/bifilar.pdf
[18:07:40] <mrsun> driving them non bipolar leaves you with alot less holding torque etc
[18:08:08] <mrsun> my motors are rated 1.85Nm at bipolar and 1.24 or something unipolar
[18:08:10] <mrsun> sucks =)
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[18:31:25] <skunkworks> does anyone have any links on how to setup a pci parallel port to epp?
[18:31:29] <skunkworks> on ubuntu
[18:31:35] <skunkworks> I am coming up blank
[18:32:27] <awallin> bios?
[18:32:34] <cradek> the drivers should do it for you
[18:32:41] <cradek> are you having trouble?
[18:32:42] <skunkworks> I don't think pci ones show up in the bios
[18:32:47] <cradek> no, they don't
[18:33:17] <skunkworks> No - but this is the 2nd or 3rd time I have read of people having problems with the g540 and pci printer port cards.
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[18:34:26] <cradek> it doesn't use EPP does it?
[18:34:56] <skunkworks> seems the g540 needs epp because it must change the pin configuration.. (thinking a push pull instead of open drain with pull up)
[18:34:57] <cradek> thought it was just dumb step/dir
[18:35:28] <cradek> ok you're above my pay grade now, no clue what it wants
[18:35:45] <skunkworks> yes - it is. It isn't using EPP per say - but it seems to change how the pins act... From what I have read. And in the g540 manual - it specifically says to use epp mode
[18:36:04] <cradek> I just found that too
[18:36:28] <cradek> no idea why it would need that
[18:37:13] <skunkworks> pcw theorizes that maybe it changes the pin config from maybe open drain with pullup to push pull or such.
[18:37:22] <cradek> sounds flaky
[18:37:42] <cradek> not pcw
[18:37:44] <skunkworks> I wish I had one here. It seems people get stuck and then give up.
[18:37:47] <cradek> that requirement (if real)
[18:37:54] <skunkworks> right
[18:38:22] <skunkworks> http://linuxcnc.org/index.php/english/component/kunena/?func=view&catid=38&id=14788&limit=6
[18:38:24] <skunkworks> one example.
[18:38:31] <cradek> hal_parport surely doesn't try to force the port into epp mode
[18:38:43] <skunkworks> Everything seems to work except the charge pump
[18:39:00] <cradek> what do you mean?
[18:39:07] <skunkworks> someone on the yahoo list had the same issue.
[18:39:39] <skunkworks> The step/dir pins and such work - it is the charge pump input that doesn't seem to work without being set to epp
[18:39:58] <skunkworks> *parallel port set to epp.
[18:40:07] <SolarNRG> Would an L298 chip drive these from an arduino? http://i.imgur.com/aJvY1.jpg
[18:42:13] <skunkworks> cradek: could the hal_parport have an option to try to set the parallel port to epp?
[18:42:39] <cradek> anything is possible
[18:42:42] <skunkworks> heh
[18:43:13] <jackc> haha
[18:43:43] <jackc> SolarNRG: likely, perhaps not at full current
[18:44:13] <SolarNRG> Is there a bigger badder brother of the L298?
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[18:45:02] <skunkworks> You would think someone made a utility to do that...
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[18:45:50] <jackc> SolarNRG: youd thinks someone made stepper drivers or something... :-p
[18:45:53] <jackc> *think
[18:45:57] <archivist> SolarNRG, use a bipolar driver for those motors, more torque, better top speed
[18:46:18] <jackc> im a big fan of the gecko drivers
[18:46:36] <PCW> skunkworks: I think Kirk Wallace from the list has such a parallel port util
[18:46:39] <SolarNRG> I can't afford a gecko :(
[18:46:52] <SolarNRG> I'm looking for a big L298 to make a very basic CNC machine with
[18:46:54] <skunkworks> PCW: ohh. I will check the wiki
[18:46:54] <archivist> http://www.arceurotrade.co.uk/Catalogue/Stepper-Motors/Stepper-Drivers
[18:46:55] <jackc> SolarNRG: ah. if you were really motivated, you could build drivers from parts
[18:47:03] <SolarNRG> I'm game for that
[18:47:05] <jackc> SolarNRG: i THINK actually, you can rock L298s in parrallel?
[18:47:12] <jackc> can someone back me up on that?
[18:47:17] <SolarNRG> ??
[18:47:20] <jackc> SolarNRG: were you planning to use the L297 also for stepping?
[18:47:30] <SolarNRG> Yeah
[18:47:42] <cradek> looks like you'd change the hal_parport_get call and add a write to set 0x80 in ECR
[18:47:49] <SolarNRG> I just want to plug this into my arduino and power supply so at least I can get the motors turning
[18:47:53] <cradek> if you had one, you could try that.
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[18:48:22] <archivist> SolarNRG, no need for arduino, drive from the parallel port
[18:48:23] <jackc> SolarNRG: one L297 and 298 pair will do that
[18:49:18] <skunkworks> PCW: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Startech
[18:49:19] <frysteev_> i wanna make a really clunky stepper driver with relays :P
[18:49:35] <SolarNRG> I can't afford a desktop with a parallel port either
[18:49:39] <SolarNRG> But I have a usb port and an arduino
[18:50:01] <Jymmm> SolarNRG: desktop with paraports you can get for free
[18:50:06] <jackc> SolarNRG: cant use cnc over usb since its polling based
[18:50:10] <jackc> BUT you can get them moving, sure
[18:50:15] <SolarNRG> That's fine for now
[18:50:16] <frysteev_> SolarNRG: grab an old laptop with a parrell port
[18:50:42] <SolarNRG> But what if I want to make my stepper motors rotate a skydish instead of a CNC machine for this?
[18:50:52] <SolarNRG> From a car battery
[18:51:10] <SolarNRG> Do you think 2 L298s in parallel would do this?
[18:51:22] <SolarNRG> 1 stepper makes it move left right
[18:51:23] <SolarNRG> one up down
[18:51:44] <SolarNRG> Like this: http://www.youtube.com/watch?v=sDnCqVxtr3k
[18:51:49] <SolarNRG> This is my solar project
[18:52:28] <SolarNRG> But I want to give it some more powerful steppers and I need drivers that won't cook my arduino
[18:55:15] <Jymmm> SolarNRG: $7 http://www.suntekstore.com/goods.php?id=14002580&utm_source=gbus
[18:55:37] <frysteev_> make some servos
[18:55:57] <frysteev_> we turned a $50 2000lbs winch into a servo
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[18:57:49] <SolarNRG> Jymm that looks very good, are you sure it will work with an arduino a car battery and my big steppers?
[18:58:18] <Jymmm> SolarNRG: I'm not sure of anything, just first hit on google for "stepper driver".
[18:59:57] <Jymmm> The manual has the schematic though.
[19:02:49] <Jymmm> shit, even has FREE SHIPING to the US/UK
[19:03:20] <frysteev_> us/uk same thing
[19:03:35] <Jymmm> Yeah, it's just a lil pond in between
[19:03:52] <SolarNRG> And those little things I screw my wires straight into right?
[19:03:58] <SolarNRG> What do I screw into VCC?
[19:04:07] <Jymmm> But is that uni or bi polar?
[19:04:15] <SolarNRG> I have 8 wire unipolars
[19:04:26] <SolarNRG> Here are my steppers http://i.imgur.com/aJvY1.jpg
[19:06:41] <SolarNRG> Can I plug my car battery + and - into VCC and GND respectively with your suntekstore stepper driver?
[19:06:58] <Jymmm> SolarNRG: I'm not sure of anything, just first hit on google for "stepper driver".
[19:07:39] <SolarNRG> It says max power consumption 20W, is that enough for these big steppers?
[19:07:53] <SolarNRG> I'm scared I might buy it and it draws too much power
[19:08:09] <ssi> frysteev_: how fast is your winch servo?
[19:09:23] <mrsun> SolarNRG, voltage/current rating ?
[19:09:29] <Jymmm> Awwww, isn't that cute... it has a PWR switch right on the PCB
[19:09:35] <mrsun> oh a stepper driver :P
[19:09:52] <SolarNRG> I honestly don't know
[19:09:59] <mrsun> SolarNRG, motor current rating and driver current rating ? :)
[19:10:07] <SolarNRG> All I know is the steppers are big, heavy, have 8 wires and are rated to 439 oz/inch
[19:10:09] <SolarNRG> or 3.1NM
[19:10:10] <frysteev_> ssi: we still used it as a winch sortof, was like 60-100 rpm
[19:10:20] <mrsun> as long as the driver can output the current, depending on type
[19:10:27] <ssi> frysteev_: I want to build a cable robot like a skycam
[19:10:45] <frysteev_> but those winch motors draw 50A no load and 100A full load
[19:10:48] <ssi> frysteev_: and I was thinking about maybe building a GODDAMN BIG ONE that could act as a 3D crane up to 500lb
[19:10:56] <Jymmm> ssi: talk to alex_joni then
[19:11:00] <mrsun> if its a chopper you can have any voltage to the rated voltage for the driver realy (according to geckodrive you should calculate maximum stepper voltage as sqrt(mH) * 31 or something like that)
[19:11:01] <ssi> Jymmm: oh yea?
[19:11:14] <ssi> I'm still trying to figure out wtf you call that kinematic
[19:11:19] <mrsun> if its a simple full step driver with no chopping you need to know the rated voltage of the motors
[19:11:21] <Jymmm> ssi: talk to alex_joni then
[19:11:25] <mrsun> else you will burn them =)
[19:11:35] <ssi> alex_joni: talk to me then!
[19:11:49] <Jymmm> alex_joni: dont talk to ssi
[19:11:53] <ssi> having something like that in my hangar that can position a 500lb load anywhere in the space would be awesome
[19:12:01] <ssi> great for things like hanging engines :)
[19:12:02] <SolarNRG> What are most stepper motor's rated voltages typically
[19:12:15] <Jymmm> ssi: 500lbs? WTF
[19:12:28] <ssi> Jymmm: what?
[19:12:45] * Jymmm just shakes his head.
[19:12:49] <ssi> I'd probably do a little one first that can follow me around with a work light and a fan
[19:12:53] <ssi> that'd be pretty good too :)
[19:13:21] <ssi> three or four 2000lb winches oughta be able to support 500lb
[19:13:28] <ssi> might be balls slow, but I bet it'd work
[19:13:31] <frysteev_> ssi: i build a small cablecar once,
[19:13:40] <Tecan> how do i use a usb to db25 printer adapter ?
[19:13:41] <Jymmm> ssi: and you are going to get elecricity to the payload how?
[19:13:52] <ssi> Jymmm: what makes you think the payload needs electricity?
[19:13:54] <Tecan> i cant find the base address
[19:14:00] <Jymmm> ssi: light, fan
[19:14:00] <Tom_itx> Tecan, you don't
[19:14:12] <Tecan> my port is fried though and i need to
[19:14:18] <ssi> hell those could be battery powered
[19:14:32] <Jymmm> Tecan: You use a PCI paraport card
[19:14:41] <ssi> or one of the cables could carry power
[19:14:45] <ssi> there's lots of ways to skin that particular cat
[19:14:55] <frysteev_> ssi: i build a small cablecar, with two aircraft cables, and drove 12V down the lines
[19:15:01] <ssi> frysteev_: yep
[19:15:03] <Jymmm> ssi: Uh huh, you keep thinking that!
[19:15:14] <ssi> Jymmm: so I have a question for YOU
[19:15:20] <Jymmm> ssi: No
[19:15:24] <frysteev_> this was inside, and for fun, wouldnt use it in a shop
[19:15:26] <ssi> Jymmm: do you ever actually contribute anything here, or do you only serve to shit on everyone else's ideas
[19:15:28] <Tom_itx> drumroll
[19:15:38] <Tom_itx> he shits alot
[19:15:53] * frysteev_ gets some ice for ssi's face
[19:16:01] <Jymmm> ssi: Oh, have you actually come up with an idea yet?
[19:16:10] <Tom_itx> ssi, ask him about his laser table
[19:16:25] <SolarNRG> Are any of you familliar with the K179
[19:17:13] <ssi> I'm not concerned about his laser table
[19:17:16] <ssi> just his attitude problem
[19:18:28] <Tom_itx> i'm not too concerned about either one
[19:18:28] <Jymmm> ssi: Maybe you were embelishng a bit (I would hope so), but to lift, carry, and move a 500lbs load on wire skycam overhead, would be HUGE! And the safety factor alone if a cable broke came loose etc would surely bug a big undertaking. Unless you just dont give a fsck.
[19:19:29] <mrsun> filesystem check ?
[19:19:37] <Jymmm> ssi: So, to me that is just talking out your a55, not "an idea" at this point. Yes, maybe I am full of shit here, but I call em as I see em. and I haven't seen anything practical so far.
[19:19:39] <mrsun> thats nice to give away :P
[19:20:09] <ssi> Jymmm: I'm aware of the difficulty of the problem, and even of the safety aspects of it. And I certainly wasn't suggesting that I'm going to offer such a thing up for sale
[19:20:23] <ssi> 15:15 < Jymmm> ssi: Uh huh, you keep thinking that!
[19:20:34] <ssi> re powering a fucking 1lb light over a cable
[19:20:41] <ssi> gosh, that must be an IMPOSSIBLE Task
[19:20:45] <Jymmm> ssi: a 500 lb pendulum
[19:22:13] <mrsun> SolarNRG, stepper voltages vary alot =)
[19:22:19] <mrsun> so does the current rating
[19:22:25] <mrsun> no info from where you bought them ?
[19:22:36] <mrsun> also differnt current for bipolar series/parallel connected
[19:26:35] <Jymmm> SolarNRG: If your motors are 400 oz/in, I seriously doubt that lil driver would even come close. My 260 oz draws 3a alone and that driver maxes at 2a and I'd suspect that includes BEMF as well.
[19:27:08] <SolarNRG> I was guestimating about 4 amps
[19:27:17] <Jymmm> SolarNRG: dont guess, do the math.
[19:27:26] <mrsun> my 1.85 draws 4A in bipolar connection
[19:27:27] <Jymmm> read the spec sheets, etc.
[19:27:33] <mrsun> bipolar parallel
[19:27:38] <mrsun> 1.85Nm
[19:27:49] <SolarNRG> This was a fleabay jobby, no ddatasheet
[19:27:55] <SolarNRG> Right mrsun, these are 3.1Nm
[19:28:02] <SolarNRG> They are unipolar
[19:28:03] <Jymmm> SolarNRG: Find it online then
[19:28:34] <mrsun> SolarNRG, you need to check, but from what ive seen the amps doesnt go very high over the holding torques in higher torques, the voltage goes up more =)
[19:29:26] <SolarNRG> 13.-4.5 amps
[19:29:28] <Jymmm> Hey guys... http://www.suntekstore.com/goods-14002019-lm8uu_8mm_linear_ball_bearing_bush_bushing_.html
[19:29:36] <SolarNRG> 24-50v
[19:29:43] <mrsun> SolarNRG, huh ?
[19:30:03] <SolarNRG> NEMA 23 439oz/inch stepper does 1.3amps to 4.5 amps and 24 to 50 volts
[19:30:18] <mrsun> 1.3 to 4.5 ? :P
[19:30:29] <mrsun> thats not e very good spec
[19:30:41] <Jymmm> mrsun: ya think? lol
[19:30:46] <mrsun> thats like saying the atlantic is somewhere betwene the north and south pole
[19:30:55] <Jymmm> mrsun: It might of well said 1 to 1000v =)
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[19:34:39] <Jymmm> Interesting, they have end blocks too http://www.suntekstore.com/goods-14003980-4pcs_20mm_aluminium_shaft_support_pillow_block.html
[19:35:52] <Jymmm> wasn't somone looking for Solenoids?
[19:39:27] <Jymmm> ssi: Here ya go when you get your power situated http://www.suntekstore.com/goods-14002878-22lbs_dc_24v_holding_electromagnet_lift_solenoid_%28zye1-p3022%29.html
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[19:40:58] <Jymmm> $4 USD SHAFT COUPLERS http://www.suntekstore.com/goods-14000192-one_aluminum_flexible_coupler_for_stepper_motor_1in_x_075in.html
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[19:42:33] <SolarNRG> Can I make stepper motors work on less than their rated voltage?
[19:42:40] <SolarNRG> Or will they not work properly?
[19:43:01] <cradek> usually you want to run a stepper with about 10x its rated voltage
[19:43:13] <mrsun> SolarNRG, you will lose power
[19:43:34] <mrsun> cradek, if you have a chopping driver yes =)
[19:43:40] <Jymmm> mrsun: I thought speed at lower voltage? torque at lower current
[19:43:42] <mrsun> make sure he has that before you recomend 10x rated voltage :P
[19:44:04] <mrsun> Jymmm, if its a constant voltage driver you will lose current with lower voltage
[19:44:11] <mrsun> anything under rated voltage you will lose current
[19:44:38] <Jymmm> mrsun: Right, but lower voltage == lower speed
[19:44:44] <mrsun> Jymmm, yes
[19:44:49] <Jymmm> lower current == lower torque
[19:44:51] <mrsun> as it cant load the magnetic fields as fast
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[19:45:30] <Jymmm> anyone need er16 collets?
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[19:46:22] <mrsun> sigh
[19:46:30] <mrsun> i dont get people
[19:46:43] <Jymmm> WOW, that's cheap... http://www.suntekstore.com/goods-14002020-dual_digital_pid_temperature_control_controller.html
[19:46:51] <Jymmm> mrsun: ?
[19:47:00] <mrsun> you try and help them, and they dont even answer back with good answers, atleast give links to the products you have bought if you dont get what the peopkle trying to help is saying =)
[19:47:38] <Tecan> awe sweet i can use the prolific 2305 chip with usb2lpt
[19:47:50] <Tecan> they have a eeprom writer for it
[19:48:40] <Tecan> to see if it works in linux after will be another thing
[19:49:17] <Jymmm> mrsun: I think SolarNRG is really enthusiastic, but technically and (seriously) financially challeneged,so he's just trying to get by on doing anything with pennies. Then we show him the stuff to use and it's all $$$ and instead of responding, he just remains silent.
[19:49:53] <mrsun> Jymmm, yes but he had motors and drivers? :)
[19:50:25] <mrsun> almost always you can make do ... like limiting the current, losing torque, like i did in the beginning before i could afford big drivers =)
[19:50:29] <Jymmm> mrsun: Sure, but he didn't even know what motors he had, so they might have been $2 off ebay with free shipping or whatever.
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[19:51:11] <mrsun> Jymmm, yeah sure ... i wonder if you can calculate the voltage for them somehow, using a motor tester or something =)
[19:51:27] <mrsun> or hell, just try, start with 2V or so and see how strong they are/hot they get
[19:51:29] <mrsun> =)
[19:51:32] <Jymmm> mrsun: or just find the dtasheet online
[19:51:57] <mrsun> Jymmm, very true, but if its totaly unknown .. but he did know the holding torque so i guess its not totaly unknown :P
[19:52:14] <Jymmm> mrsun: =)
[19:52:29] <mrsun> hope he comes back, i dont like it when people get scared to ask :(
[19:53:03] <mrsun> trying to be as little elitistic as i can ... =)
[19:53:11] <Jymmm> mrsun: he will eventually, his ISP might have jsut went poof too
[19:53:38] <Jymmm> mrsun: nah, go ahead be the motor-nazi you want to be!
[19:54:13] <mrsun> Jymmm, haha im not a natzi, but realy need specs to be able to help people ... took me a long time to start to understand all this even when i had the specs for the motors =)
[19:54:25] <mrsun> and alot of people here has been patient with me also =)
[19:54:44] <Jymmm> mrsun: Mybad, I meant to call you a driver-nazi, not motor-nazi!
[19:54:50] <mrsun> haha :P
[19:55:04] <mrsun> Jymmm, imo just buy the biggest freakin drivers you can get your hands on and never ahve a problem anymore :P
[19:55:11] <mrsun> just set the current and drive! =)
[19:55:28] <Jymmm> mrsun: 440 3ph and some REALLY fast relays?
[19:55:49] <Jymmm> HAWT FSCKING DAMN!!!!! http://www.suntekstore.com/goods-14002287-lm2577s_dc-dc_adjustable_step-up_power_supply_module.html
[19:55:51] <mrsun> or like the motors where im "working" atm .. 200kw etc =)
[19:55:59] <mrsun> and some very beefy relays ;P
[19:56:25] <Jymmm> DAMN DAMN DAMN no manual
[19:56:59] <Jymmm> Ok, how shitty can a step-up really be?
[19:57:19] <mrsun> depends on the girls doing the stepup ;)
[19:57:20] <Jymmm> Yeah yeah, EMI shielding and heatsink needed, but still
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[19:58:15] <Jymmm> mrsun: I was being serious actually. Been looking for years
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[20:00:12] <Jymmm> mrsun: My netbook will run on 12V, but will not charge unless is see's 15.1VDC. So, step-up from 13.8VDC (car) to 15.1VDC at less than 2A works for me
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[20:00:48] <Jymmm> hi JT-5i25
[20:01:19] <Jymmm> JT-5i25: I found you a new welder
[20:01:40] <Jymmm> JT-5i25: well, plasma cutter the is
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[20:10:18] <raynerd> Can someone on here talk to me about BOBs. I`m using a cheapo TB6560 and I`m going to move over to M452 drivers but I`ll need a BOB and I`ve read as much as I can, but I don`t get what I`m paying for! They seem to be from 10 to £80 - I don`t know how a relay would be used, as some of them advertise. Some of them say they have charge pump... is this useful and necessary?
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[20:19:33] <awallin> raynerd: optical isolation is useful, if you run high voltages on the motor side..
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[20:33:33] <Jymmm> CHEAP 3 axis stepper driver and breakout board all in one WITH paraport cable... http://www.suntekstore.com/goods-14002539-3_axis_stepper_motor_driver_controller_board.html
[20:34:43] <Jymmm> 5 AXIS driver for $17USD http://www.suntekstore.com/goods-14002537-5_axis_interface_board_for_stepper_motor_driver_cnc_mill_w_cable.html
[20:35:19] <Jymmm> mybad, 5 axis breakout
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[20:38:58] <JT-Shop> this is going to suck if it keeps resetting my connection
[20:39:14] <Jymmm> JT-Shop: dsl?
[20:39:22] <JT-Shop> satellite
[20:39:37] <Jymmm> JT-Shop: is that new, or you've had it for a few months?
[20:39:47] <JT-Shop> about an hour now
[20:40:01] <Jymmm> JT-Shop: Oh, they JUST installed it today?
[20:40:09] <JT-Shop> yea
[20:40:31] <Jymmm> JT-Shop: what speeds?
[20:40:54] <JT-Shop> 9 down and 2 up
[20:41:06] <Jymmm> JT-Shop: satellite or microwave?
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[20:41:16] <Jymmm> a square antenna?
[20:41:18] <JT-Shop> satellite
[20:41:26] <JT-Shop> wildblue
[20:41:40] <Jymmm> is the antenna square or oval?
[20:41:44] <JT-Shop> ain't no microwave out here
[20:41:51] <JT-Shop> oval
[20:41:52] <JT-Shop> why
[20:41:54] <Jymmm> k
[20:42:07] <JT-Shop> why
[20:42:11] <Jymmm> just gives me an idea
[20:42:14] <Jymmm> of what you have
[20:42:24] <JT-Shop> wildblue satellite
[20:42:59] <JT-Shop> seems like every few minutes it resets the IRC connection...
[20:43:39] <Jymmm> you might increase the ping time or keep alive
[20:44:01] <JT-Shop> in chatzilla?
[20:44:19] <Jymmm> in whatever, it's probably seeing you as idle and disconnects.
[20:46:03] <Jymmm> JT-Shop: maybe stream some music and see if that makes a difference
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[20:48:32] <Jymmm> JT-Shop: maybe stream some music and see if that makes a difference
[20:48:57] <JT-Shop> I don't know how
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[20:49:20] <Jymmm> JT-Shop: http://www.pandora.com/
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[20:56:58] <DJ9DJ> gn8
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[20:58:56] <JT-Shop> nope...
[20:59:04] * JT-Shop heads out for a while
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[21:05:25] <TRWags> Hi, some body knows if its posible to force the state of an inpunt in classicladder, for debuging?
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[21:58:23] <Tecan> is 5000 pretty standard for driver timing
[21:59:01] <Tecan> whats the 20000 for ?
[21:59:40] <Tecan> i upped the amps and volts to the driver board now im able to get like 2.4 out of them
[21:59:50] <Tecan> anything more and the steppers slip
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[22:43:10] <Tecan> wholy jesus
[22:43:19] <Tecan> my mechantronics driver kicks ass
[22:43:23] <Tecan> aliencnc sux
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[23:00:58] <ssi> what's the right way to scale a spindle encoder
[23:01:05] <ssi> such that 1 unit of position == 1 revolution?
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