#emc | Logs for 2011-04-09

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[00:27:22] <Valen> I got the 5i23 (i think?) the PCI one anyway
[00:27:24] <Valen> works well
[00:28:13] <Valen> "one of these days" I'll get the xbox controller hooked up for jogging
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[00:32:32] <atom1> would that be the same as the 7i43 only pci?
[00:33:01] <atom1> it would be nice to figure out their numbering system
[00:36:26] <Valen> i dunno which one it was exactly the one that was the mid range one ~$220
[00:36:44] <Valen> I figured PCI is probably going to have less latency than running through the parallel port
[00:50:06] <bzzzz> do it on a micro, problem solved
[00:51:14] <bill2or3> replaced, anyway.
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[00:57:18] <brendanjerwin> Hi folks. I'm wrestling with the hal tonight. I'm trying to create a MCode script that will set a signal that I also set via a pyvcp widget. Is it possible for a signal to be written to from multiple places?
[00:57:55] <brendanjerwin> The error I get says it "already has writer(s)" so it seems that it might be.
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[01:15:01] <brendanjerwin> Put another way: I'm trying to control a value both from a control panel (pyvcp) and an MCode. When the MCode runs, I'd like my control panel to update to the new value. Possible?
[01:16:56] <bzzzz> semi-rhetorical question to emc devs: is there any interest in writing a fixed-point version of stepgen?
[01:17:40] <bzzzz> would there be*
[01:20:17] <SWPadnos> the part of stepgen that does the actual step generation is fixed-point
[01:20:31] <SWPadnos> IIRC, make_pulses doesn't require floating point at all
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[01:37:30] <bzzzz> SWPadnos: hm, i meant update_{freq and pos}
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[01:38:20] <SWPadnos> no, I imagine there isn't a lot of impetus to change those parts
[01:38:46] <cradek> to what end?
[01:38:48] <SWPadnos> since most every likely target CPU has floating point hardware available
[01:40:04] <bzzzz> anyway, i was reading through stepgen.c and saw jmk's todo/fixme note, so i thought i'd volunteer
[01:40:15] <bzzzz> in update-freq, that is
[01:40:30] <SWPadnos> well, if you like, go for it :)
[01:41:16] <bzzzz> cool. the bottleneck's likely in make_pulses, since it gets hit most often, but maybe i can squeeze a bit more juice out
[01:41:19] <SWPadnos> but realize that there is no overhead to using floating point in those functions. There will already be something in that thread, like the motion controller, that uses FP, so the registers will be available
[01:41:25] <SWPadnos> no, you won't :)
[01:41:30] <SWPadnos> not on i386 anyway
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[01:42:13] <SWPadnos> modern CPUs only take 1-3 cycles to do floating point multiplies (basically the same as integer), and division is a maximum of 39 cycles, IIRC
[01:42:21] <bzzzz> hm, i should probably mention that i've been talking from arm land
[01:42:28] <SWPadnos> and those are the 1-3 GHz cycles
[01:42:47] <SWPadnos> well, if you have an ARM version of EMC running, then by all means donate that first :)
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[01:45:28] <bzzzz> :>
[01:45:51] <bzzzz> still porting the motion control stuff first
[01:46:17] <SWPadnos> got RTAI yet?
[01:46:25] <bzzzz> i figure i'd leave the everything higher than g-code interp on the pc
[01:46:26] <SWPadnos> or another realtime layer
[01:46:40] <bzzzz> bare metal actually
[01:47:22] <bzzzz> i'm still in fast-dash-to-testing mode
[01:48:30] <SWPadnos> heh. what interface do you have to the controlling PC?
[01:50:52] <Jymmm> telepathy
[01:52:24] <SWPadnos> oh. I should have known
[02:17:06] <brendanjerwin> Is it possible to get a total time remaining display for a program?
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[03:43:15] <elmo40> brendanjerwin: does this help? http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?SimpleCycleTimer
[03:43:54] <elmo40> I guess that only does cycle time. not time remaining.
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[03:45:42] <elmo40> Axis does display a guesstimation on how long the cycle will take.
[03:46:25] <elmo40> but how do you know how much time is remaining if you are there and change feeds to check things?
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[09:13:07] <bzzzz> SWPadnos: parport
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[14:00:46] <L84Supper> bzzzz: what ARM are you using? I'm working with Cortex-a8 and higher for EMC with VFP, RTAI is not a problem
[14:03:06] <L84Supper> many have PCIe. SDIO looks fast enough for servo control. I'll get around to it in a few weeks.
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[15:08:43] <brendanjerwin> Is there a code to toggle machine power? I'd like my machine to power down after it's done with a job.
[15:09:45] <atom1> user definable M code on a ss relay?
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[15:20:26] <brendanjerwin> atom1: I was hoping to tie into the same signal/pin that Axis does with F2
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[15:43:29] <skunkworks> http://www.cnczone.com/forums/benchtop_machines/125999-grizzly_x3_rigid_tapping_1000rpm.html
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[15:47:41] <archivist> ah gearing spindle to axis is outside mach3
[15:48:07] <skunkworks> yes
[15:48:44] <psha> brendanjerwin: axis have very limited set of exported pins
[15:49:10] <psha> but there are many exported by halui
[15:49:20] <psha> check it
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[15:52:31] <anonimasu> can you move the stepgen pins around? somehow
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[15:58:58] <anonimasu> I have a problem I have a 7i47 board connected and I cant get output on the stepgen pins
[15:59:02] <anonimasu> (with this install)
[15:59:06] <anonimasu> with my old one all works
[16:00:12] <pcw_home> if you re-compile the firmware source you can
[16:00:13] <pcw_home> you need a config that has a name that ends in 7I47
[16:00:29] <anonimasu> pcw_home: you gave me a firmware a long time ago
[16:00:48] <anonimasu> that was working fine, but i upgraded to a new computer and it just dosent work
[16:00:54] <anonimasu> with the new firmware
[16:01:38] <anonimasu> I have a 7i47 on p3 and a 7i37com p4
[16:01:45] <anonimasu> and I get output for only one axis to move
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[16:01:54] <anonimasu> when I swap back to my old computer all axes work
[16:02:01] <pcw_home> well you should be able to use the old firmware (assuming the hardware is the same)
[16:02:26] <anonimasu> will it behave like this one that I can restart emc and not power off and on my boards?
[16:02:34] <anonimasu> like I had with my old one
[16:02:45] <anonimasu> I cant even get any output on any pins from stepgen with this one
[16:04:03] <pcw_home> did you check that the firmware pinouts are the same?
[16:04:19] <anonimasu> no, I expected to re-wire my setup so that it will work with current
[16:04:50] <anonimasu> only my y axis works nothing else :/
[16:04:59] <pcw_home> Well the configuration has to match the daughtercard so you need a 7I47 step config
[16:05:15] <anonimasu> mhm, where can I find one of thoose?
[16:05:54] <anonimasu> is that the pin file we are talking about?
[16:06:06] <anonimasu> sorry if im confused about this
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[16:06:16] <anonimasu> I kindof expected the stepgens to just be in the same place :)
[16:06:34] <pcw_home> There are standard ones for the PCI cards but i think it needs to be built for the 7I43
[16:06:58] <anonimasu> can I do that myself?
[16:07:13] <pcw_home> The 7I47 has some input pins and some output pins so a config needs to match
[16:07:29] <anonimasu> or should I just grab the old stuff from my old computer
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[16:08:00] <pcw_home> you can get the pinout by enabling the debug option
[16:08:20] <anonimasu> I am moving and measuring the pins with a scope and I cant seem to get anything
[16:10:12] <pcw_home> I would use the old config for now, and I can make a new one on Monday
[16:10:14] <pcw_home> What is the name of the new bitfile you are using?
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[16:12:13] <anonimasu> svst4_4s.bit
[16:16:54] <atom1> pcw_home, what's the matching PCI board for the 7i43, the 5i23?
[16:17:23] <anonimasu> atom1: btw, the reason for the daughtercards is becasue it makes wiring easy
[16:17:42] <atom1> anonimasu, are they just breakout boards?
[16:17:52] <anonimasu> no
[16:17:57] <anonimasu> one is optoisolated and one is step/dir
[16:18:05] <anonimasu> and on the lathe I have a servo driver board
[16:18:09] <atom1> which is step dir?
[16:18:38] <anonimasu> the 7i47 im using
[16:18:51] <atom1> ok so it works along side the 7i43?
[16:19:09] <anonimasu> pcw_home: the firmware im using is hostmot2-firmware-bin-7i43-4.0.5
[16:20:11] <anonimasu> err svst2_4_7i47s
[16:25:02] <anonimasu> why is there no included bitfile for this?
[16:25:18] <anonimasu> or maybe im doing something else wrong
[16:25:59] <pcw_home> so the new bitfile you are using is svst2_4_7I47s?
[16:26:15] <anonimasu> there us none like that included with the emc install
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[16:28:50] <tom3p> is there a map of sys vars? (like what is, say... #5161?, what is free? what is used?, what ranges are for what purpose? )
[16:28:55] <pcw_home> atom1 theres not much similarity in the 7I43 and 5I23
[16:28:57] <pcw_home> The problem is that there millions of possible configurations
[16:28:58] <pcw_home> you should be able to use the older bitfile untill I build a new one
[16:29:08] <anonimasu> no problem with that copying it now
[16:29:43] <atom1> pcw_home, what i am wondering is if there are corresponding pci boards that match the parport ones' functionality
[16:29:59] <pcw_home> And you can make your own configs but you need the (free) xilinx tools
[16:30:24] <atom1> what chip does it get loaded into?
[16:30:32] <pcw_home> functionality?
[16:30:48] <atom1> let me rephrase
[16:31:11] <atom1> are there pci boards with the same layout as the parport ones?
[16:31:27] <atom1> excepting the interface
[16:32:28] <pcw_home> Well lthey all have the same base layput, the rest is just determined by the bitfile (and number of I/O pins)
[16:33:16] <pcw_home> s/layput/layout/
[16:33:16] <atom1> i presume the bitfile gets loaded into flash
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[16:33:30] <atom1> and if you need major changes you would upload new firmware to the fpga
[16:33:46] <pcw_home> normally not, it gets loaded directly into the FPGA
[16:34:04] <atom1> what config stuff is stored in flash then?
[16:34:06] <atom1> or any?
[16:35:04] <pcw_home> nothing (the pci cards except the 3X20 and 5I25 have no flash at all)
[16:39:04] <pcw_home> The 7I43 has flash but EMC does not use it, always loading the firmware everytime it starts
[16:40:19] <atom1> i just get conflicting, confusing replies on what boards i need. steppers with a possible jog wheel, limit switches and coolant, spindle control
[16:40:35] <atom1> i see the 7i43 as a base for it
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[16:51:18] <pcw_home> for a minimal system with 7I43 you can use the FPGA outputs directly
[16:51:20] <pcw_home> for a little more rugged system, you could use a 7I42TA breakout (which still uses the FPGA I/O directly but the I/O has some protection)
[16:51:22] <pcw_home> for more delux I/O you could use a 7I47S and a 7I37COM, this will give you 4 buffered 5V step+dir outputs, and isolated analog voltage for a spindle control
[16:51:23] <pcw_home> a opto isloated dir and enable for the spindle and 8 isolated 1A 5-48V outputs and 16 isolated 5-24V inputs
[16:54:38] <atom1> 7i42TA same as the 7i42 with screw terminals?
[16:57:10] <atom1> thanks
[17:05:33] <pcw_home> yes
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[17:07:29] <pcw_home> bbl time to talk to the sheep...
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[17:24:14] <Jymmm> Um, I don't think I want to know.
[17:25:52] <Jymmm> If we start to hear Barry White (RIP) playing in the background at pcw_home, RUN!
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[17:35:32] <pcw_home> seen on classiscopm list: http://blog.jitbit.com/2011/04/chinese-magic-drive.html
[17:35:39] <pcw_home> comp
[17:37:12] <Jymmm> pcw_home: http://dc222.4shared.com/img/447681706/7a5dbd61/dlink__2Fdownload_2FlenexhwV_3Ftsid_3D20101227-84190-a76bd700/preview.mp3
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[18:16:26] <Jymmm> Is there any drawing programs that would allow me to "deform" a circle while maintaining the original circumference?
[18:17:06] <Jymmm> By deform, I mean circle to ellipse
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[18:18:10] <SWPadnos> I don't think I've ever seen anything like that
[18:18:20] <Jymmm> =(
[18:18:37] <SWPadnos> you're saying you want to take the circumference of a circle, and keep that same distance while flattening it to an oval?
[18:18:47] <Jymmm> correct
[18:19:03] <SWPadnos> I think that may not be an easy problem
[18:19:27] <Jymmm> SWPadnos: have sheet material of a fixed size, and need to see what ovals I can come up with.
[18:19:46] <SWPadnos> why does the perimeter need to be the same?
[18:19:53] <Jymmm> SWPadnos: have sheet material of a fixed size, and need to see what ovals I can come up with.
[18:20:06] <SWPadnos> that doesn't explain it, or I wouldn't have asked the question
[18:20:34] <Jymmm> take a sheet of paper and curl it into a circle. Now into an oval
[18:20:57] <SWPadnos> ok, that helps :)
[18:21:20] <Jymmm> or wrap a piece of paper around a 4" pipe
[18:21:37] <SWPadnos> ok, it looks like the formula is actually not that bad: http://www.csgnetwork.com/circumellipse.html
[18:22:00] <archivist> some high end cad has sheet metal and bending
[18:22:10] <Jymmm> SWPadnos: Ha.... http://en.wikipedia.org/wiki/Circumference#Circumference_of_an_ellipse
[18:22:29] <SWPadnos> yeah. the one I linked to is an approximation
[18:25:31] <Jymmm> Yeah, I was thinking sheet metal might, just don't have any
[18:27:27] <Jymmm> any other suggestions?
[18:28:50] <archivist> use a bit of paper the right size or to scale
[18:29:05] <archivist> or string
[18:29:43] <Jymmm> The issue is I need to draw this up on the computer, so I can cut on the laser
[18:30:54] <Jymmm> I guess I need some "rubber band" effect in a drawing program.
[18:31:20] <archivist> just put the formula in excel (or any cad that can use formulas as constraints) to get possible sizes
[18:31:42] <Jymmm> have you seen the formula?
[18:32:01] <Jymmm> http://en.wikipedia.org/wiki/Circumference#Circumference_of_an_ellipse
[18:33:45] <archivist> you only need an approximation
[18:36:42] <tom3p> tilt the workpiece, the circle becomes an oval, tilt it a lot, it becomes a line
[18:36:49] <tom3p> maybe thats of use
[18:37:06] <Jymmm> tom3p: Tried it already =)
[18:37:58] <tom3p> the circle is special form of an ellipse ( ellipse is the general case , circle is where the 2 radii are equal )
[18:39:50] <Jymmm> SW doesn't have it either =(
[18:47:05] <tom3p> ? same circumference? hmm, http://www.easysurf.cc/circle.htm << is a web calculator, plug away with the vars keeping the answer the same ;)
[18:47:34] <tom3p> scroll down to "Calculate Circumference of an Ellipse"
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[18:49:54] <Connor> anyone know who made this pendant? http://www.youtube.com/watch?v=C1B_YsfI89s&feature=related I can't find any info on it except the video and the username fupeama
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[18:51:31] <archivist> Connor, you can send the user a message
[18:53:03] <archivist> I get questions about my vids sometimes
[19:00:33] <DaViruz> ooh pendat with dro, that is kind of nice
[19:21:59] <atom1> Jymmm, take a circle and sit on it
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[19:31:54] <atom1> http://mathforum.org/dr.math/faq/formulas/faq.ellipse.html
[19:33:24] <atom1> solve for one given radius and the circumference
[19:34:03] <atom1> probably works only for 'true' elipses
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[20:28:33] <mozmck> Connor: http://www.franksworkshop.com.au/CNC/LathePendant/LathePendant.htm
[20:28:49] <mozmck> There's another one.
[20:29:32] <Connor> Interesting..
[20:29:53] <Connor> I like the looks of that one.
[20:32:02] <Connor> I got a 20x4 lcd and a 128x64 LCD I was thinking of using one for my pendant.. I don't have the case yet..
[20:32:41] <Connor> He's using encoders instead of a membrane push button setup..
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[21:26:58] <Jymmm> Anyone know anything about calcium magnesium hydroxide by chance?
[21:28:14] <Jymmm> Specifically in it's use as a total ground killer
[21:28:35] <TekniQue> I only know agent orange
[21:28:48] <Jymmm> I'm talking weeds and plants
[21:29:51] <TekniQue> agent orange is a herbicide
[21:30:15] <Jymmm> but is it less than $5/50 lbs ?
[21:31:16] <TekniQue> I wouldn't use it even if it was free of charge
[21:31:43] <TekniQue> it's probably illegal too
[21:32:11] <Jymmm> then it's of no use to me
[21:32:17] <Connor> Agent Orange / Paraquat is..
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[21:48:12] <Gensor> hello
[21:48:26] <micges> hi
[21:49:22] <Gensor> the last time I used IRC was 15+ years ago
[21:49:48] <Gensor> looking for mesa servo advise
[21:50:38] <alex_joni> ask away, answers will overwhelm you :)
[21:51:22] <Gensor> http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/catid,30/id,8690/lang,english/
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[21:55:44] <Gensor> Hello,
[21:55:44] <Gensor> I am curious what the cost and mesa card differences would be between the following:
[21:55:44] <Gensor> 1) Bridgeport series 1 or 2 850-1350 oz-in steppers upgraded to AC? DC? brush(less?) servos and Mesa cards. Please provide the best off-the-shelf solution, and an ebay equivalent for the servo/encoder. Suggested powersupply solution/volts/amps?
[21:55:44] <Gensor> 2) Bridgeport series 1 or 2 DC brush servo system upgraded to Mesa cards
[21:55:44] <Gensor> 3) Bridgeport series 1 or 2 AC servo system upgraded to Mesa cards
[21:55:44] <Gensor> Keywords: Bridgeport Boss, Bridgeport Interact
[21:55:44] <Gensor> Old Mesa Card for Reference and is a good example of end product I am trying to achieve, joysticks included in I/O:
[21:55:45] <Gensor> machineability.com/Bridgeport_series_II.html
[21:55:45] <Gensor> Please help connect the dots. Thanks!
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[22:02:35] <Gensor> yawn...
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[22:14:16] <Gensor> wow... no bots here serving out files etc
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[22:20:43] <Gensor> So..... when during the week is this chat room the fullest?
[22:21:46] <mozmck> hmm, I think it varies a bit. evenings can be busy, and weekdays.
[22:26:16] <Gensor> what brand of driver boards are your preference when 700oz-in is your minimum requirement for torque?
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[22:27:16] <JT-Shop> not enough information
[22:28:05] <Gensor> JT..... good answer :), more specifically what are you using just out of curiosity sake
[22:28:35] <JT-Shop> for my plasma I use Gecko 203v stepper drives
[22:28:53] <Gensor> have you used anything else?
[22:29:00] <JT-Shop> for my CHNC I use Semiens drives for my servos
[22:29:37] <Gensor> are you happy with the semiens
[22:29:44] <JT-Shop> I could not find a better drive to fit my needs at the time
[22:29:55] <JT-Shop> yea, they came on the lathe
[22:30:17] <Gensor> are you happy with emc capability on your lathe
[22:30:31] <JT-Shop> so are you talking about steppers or servos or just gathering info?
[22:30:58] <JT-Shop> EMC is 1000% better than any other control I've seen or tried
[22:31:08] <JT-Shop> or own
[22:31:58] <Gensor> I would prefer to find a bad controller bridgeport boss or interact with dc servos given what I have researched so for, but have an opportunity to pick up a stepper for cheap
[22:32:01] <Jymmm> ticker tape FTW!
[22:32:24] <JT-Shop> knee mill is what your after?
[22:32:44] <Gensor> nc cnc for upgrade, yes
[22:32:49] <JT-Shop> Jymmm: my ass is tired
[22:33:26] * Jymmm hands JT-Shop a four post stool UPSIDEDOWN to rest his ass on
[22:33:36] * JT-Shop wishes his VMC and Series 1 was all ready converted to EMC
[22:33:49] <JT-Shop> I'd fall through LOL
[22:33:58] <Jymmm> JT-Shop: how long tdo you think it'll take to do the conversion?
[22:34:27] <JT-Shop> 200 miles with a 60 mph cross wind all friken day
[22:34:29] <Gensor> me.... 6months as a hobby project
[22:34:36] <JT-Shop> on which one Jymmm ?
[22:34:44] <Jymmm> JT-Shop: the cnc center
[22:35:15] <JT-Shop> that one would take a few days just to figure out what does what
[22:35:28] <Jymmm> two years?
[22:35:38] <JT-Shop> right now the tool change and threading is handled by hardwired boards lol
[22:35:49] <Jymmm> Um, ouch
[22:36:00] <JT-Shop> I plan on doing the BP as soon as I get it moved to my new shop
[22:36:36] <Gensor> so... who are the gurus on mesa servo?
[22:36:37] <Jymmm> JT-Shop: In the meantime make my laser robot, I'll paypal you the $20
[22:36:44] <JT-Shop> with the new tool change once the wires are sorted out the conversion should go smooth on the VMC
[22:37:06] <JT-Shop> Peter :)
[22:37:31] <Gensor> when is the best time to get ahold of peter on here
[22:37:32] <JT-Shop> I use 5i20, 7i37TA's and a 7i33TA for my lathe
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[22:38:08] <JT-Shop> he is on the left coast...
[22:38:31] <JT-Shop> you have a tricky application for mesa servo?
[22:39:03] <Gensor> can mesa support ac servo?
[22:39:30] <JT-Shop> a velocity drive?
[22:39:42] <JT-Shop> I would just say yes
[22:40:00] <Gensor> is that a guess, or an affirmative
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[22:40:13] <JT-Shop> robh__: just put some AC drives and motors on one of his lathes
[22:40:32] <JT-Shop> if it is an industry standard drive YES
[22:40:50] <JT-Shop> if it takes a usb cable and is a smart drive NO and NO
[22:42:15] <Gensor> excellent, I am finally gaining some traction here. Thanks!
[22:43:03] <Gensor> so..... DC or AC servo is supported by mesa. do you have a cheap source for servos?
[22:43:29] <JT-Shop> robh__: got his from China on fleabay
[22:43:39] <JT-Shop> he might chime in and say where
[22:43:59] <JT-Shop> If you purchase drives get AC
[22:43:59] <Jymmm> "the right coast"
[22:44:05] <JT-Shop> LOL
[22:44:47] <Gensor> jymmm, what mesa cards did you use for ac servo
[22:44:49] <JT-Shop> it doesn't matter what the drive is you only send usually +-10v as a velocity to the drive and read the position from the encoders
[22:44:59] <Jymmm> Gensor: none
[22:46:05] <Gensor> any other words of wisdom?
[22:46:05] <JT-Shop> the drive takes care of the motor
[22:46:38] <JT-Shop> yes, glass scales can/will/are a pia... much easier if you have encoder feedback from each axis
[22:47:16] <JT-Shop> resolver feedback usually requires a conversion board to get encoder like signals
[22:50:25] <Gensor> I believe there are three mesa pci cards, other than input/output are there any advantages of one over the other?
[22:52:07] <Gensor> i meant to say "other than input/output count "
[22:53:53] <atom1> the 7i43 can be configured for servo as well as stepper right?
[22:54:07] <atom1> with the proper daughter cards
[22:54:25] <JT-Shop> the 5i20 is usually the one you use unless you need the one with more I/O for some reason
[22:54:41] <atom1> will the 5i20 work on steppers?
[22:54:53] <JT-Shop> yes, I use one on my plasma
[22:55:02] <atom1> that's pci right?
[22:55:06] <JT-Shop> with the Gecko203v drives
[22:55:07] <atom1> all the 5xx boards seem to be
[22:55:09] <JT-Shop> yep
[22:55:30] <atom1> what's the 5i20 with more io called?
[22:56:00] <atom1> i'll look in a bit.. gotta run to target for a sec
[22:56:46] <atom1> i just wanna be able to use it on steppers initially and if i upgrade to servo, still be able to use the boards
[22:56:57] <JT-Shop> it's one of the other one 22 or 23 I forget
[22:57:03] <atom1> with possible daughter card swap
[22:57:06] <atom1> ok
[22:57:18] <JT-Shop> I run my geckos right off the 5i20
[22:57:40] <atom1> no buffer board?
[22:58:19] <JT-Shop> nope
[22:58:24] <atom1> what sort of feedrates can i expect from the steppers with the mesa boards?
[22:58:34] <Gensor> heheeh
[22:58:45] <JT-Shop> the mesa boards are faster than any stepper you have
[22:58:49] <Gensor> need more information
[22:58:55] <JT-Shop> stepper drive
[22:59:02] <atom1> generally speaking
[22:59:03] <JT-Shop> Gensor: is catching on :)
[22:59:17] <Gensor> how much mass are you trying to move
[22:59:23] <JT-Shop> on my plasma I go 450IPM :)
[22:59:29] <atom1> a dump truck
[22:59:29] <atom1> that's pretty good
[22:59:54] <atom1> i have some 20yr old hardware on these (not emc) and i get about 35ipm 20tpi screw
[23:00:05] <Gensor> a printer stepper motor will move a train if geared properly, but will be slow
[23:00:06] <JT-Shop> I can go faster but have no need to get there before I leave as the table is only 36" x 52"
[23:00:30] <JT-Shop> atom1: on a knee mill kind of machine?
[23:00:47] <Gensor> how big are your steppers
[23:00:48] <atom1> just a little sherline but plans on upgrading one day
[23:00:55] <atom1> 282in oz
[23:01:07] <Gensor> similar to a bridgeport series 1
[23:01:10] <atom1> i replaced some 135 in oz recently
[23:01:18] <atom1> that alone helped alot
[23:01:29] <atom1> i don't do much with it but i like to play
[23:01:39] <atom1> used to program the big ones and like to keep in touch
[23:01:40] <JT-Shop> holding torque is not how fast you can go
[23:01:52] <atom1> i know
[23:01:52] <JT-Shop> voltage is king for speed on steppers
[23:02:04] <atom1> that's why i'm going with a 50v supply
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[23:02:09] <JT-Shop> I'm running 65v or so on my plasma
[23:02:11] <atom1> working on that right now
[23:02:18] <atom1> surplus stuff locally
[23:02:27] <JT-Shop> did you use the wiki page to calculate best voltage?
[23:02:29] <atom1> i may use 2 transformers
[23:02:43] <atom1> no
[23:02:50] <JT-Shop> know where it is?
[23:02:52] <atom1> no
[23:02:54] <atom1> :D
[23:02:57] <Gensor> I think you will be fine with a sherline type if you do not push it
[23:03:23] <atom1> i'll be back in an hour or so. gotta go make the mrs happy at target first
[23:03:24] <JT-Shop> here is one page http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Stepper_Formulas
[23:04:06] <atom1> http://www.kelinginc.net/KL23H276-30-8B.pdf
[23:04:10] <atom1> those are the steppers
[23:04:23] <atom1> bak in a bit
[23:04:47] <Gensor> read up on your torq curve
[23:06:00] <Gensor> jt: thanks for the info on ac dc servo
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[23:36:26] <JT-Shop> np
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