#emc | Logs for 2011-05-26

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[00:03:32] <Tom_itx> hal configuration
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[00:05:33] <FinboySlick> Aw darn! Now the spindle is on all the time again but I can step the motors.
[00:06:35] <FinboySlick> I'll get there evenutally!
[00:07:39] <elmo40> was just given a proximity sensor :) http://qurl.org/D91
[00:08:55] <elmo40> 2mm range, not bad
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[00:16:16] <Gensor> JT: What do you recommend for a home/limit sensor that is resistant to fluids etc
[00:17:18] <Gensor> PCW: Any luck on your circuit?
[00:18:20] <PCW> I haven't had time, I'll try an put something together tomorrow
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[00:20:34] <Tom_itx> factor, i found his parport stuff
[00:20:51] <Tom_itx> http://eds.dyndns.org/~ircjunk/tutorials/prog/parport2/parport_launch_msvc.html
[00:21:02] <Tom_itx> the other file was for linux use
[00:21:24] <Tom_itx> maybe that was what you needed
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[00:30:13] <tom3p> Gensor look at http://www.automationdirect.com search for 'limit switch' and get ideas of whats available in mechanical switches,
[00:30:14] <tom3p> else look at thier prox's for solid state solutions
[00:32:02] <Gensor> Tom3P: Thanks!
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[01:46:03] <Tom_itx> i must be missing a step
[01:46:38] <Tom_itx> i mapped motion.spindle-on to a gpio pin and i can see it in hal but not at the pin
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[02:39:40] <skunkworks> I forget - do you have to tell the pin that it is an output?
[02:41:52] <Tom_itx> yeah i figured it out
[02:42:15] <Tom_itx> i think it's inverted from what i need as well
[02:42:50] <Tom_itx> .is_output , .is_opendrain and .invert_output are parameters for gpio
[02:44:13] <Tom_itx> or i could just use the differential pin on the 7i47 board
[02:44:38] <Tom_itx> it has both TX0 and /TX0 available
[02:48:48] <Tom_itx> odd the signal is active low
[02:49:21] <Tom_itx> long as we know, we can play by the rules...
[02:50:40] <Tom_itx> now to add a button on the pendant for spindle with an led by it
[02:50:59] <Tom_itx> push on, push off
[02:51:28] <Tom_itx> maybe. that could be hazardous
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[03:01:39] <factor> <Tom_itx>Thanks looking , ihad already wrote a mina loop its working fine.
[03:01:50] <factor> main^
[03:02:02] <factor> soldering iron and glue gun on my desk hard to type
[03:02:22] <factor> making a db breakout board currently
[03:16:36] <Tom_itx> that's the norm for me
[03:18:25] <Tom_itx> http://tom-itx.dyndns.org:81/~webpage/scope/scope2.jpg
[03:18:35] <factor> got the PIC debouncing signal working pretty stable.
[03:18:36] <Tom_itx> add another kbd and monitor off to the left
[03:18:45] <Tom_itx> and tv behind it
[03:19:02] <factor> finsihed with the input partss , dunno if I need to use ack and busy , may add them later
[03:19:04] <Tom_itx> and a few more papers, a couple mesa boards and you see wht i'm up to
[03:19:51] <factor> nifty
[03:19:56] <Tom_itx> max makes a cute little debounce chip
[03:20:05] <Tom_itx> 6818 iirc
[03:20:13] <factor> i have a small cutting mat
[03:20:16] <Tom_itx> max6818 (i'm guessing)
[03:20:42] <factor> pic prog is working fine , I have the debounce and stepper controls working
[03:20:58] <factor> forward backward x y right now plus speed hi and low control
[03:21:10] <Tom_itx> http://www.maxim-ic.com/datasheet/index.mvp/id/1896/t/al
[03:21:16] <Tom_itx> if you need a whole port debounced
[03:21:27] <factor> want to get x and y down first then work on z and spendle axis
[03:22:04] <Tom_itx> we generally read a pin a few times as a debounce
[03:22:15] <Tom_itx> ~20-30 ms typically
[03:22:28] <factor> i have code to detect rise and fall set and reset
[03:22:49] <factor> works good ,so now i moved on to the spp
[03:23:03] <Tom_itx> there's several ways to approach it
[03:23:16] <factor> i think i go it doen to 2ms the main loo overhead about 10ms
[03:23:25] <factor> loop^
[03:23:46] <factor> 3.6o per step 4 steps per cycle.
[03:24:04] <factor> so no less than 4 steps to make sure you move for or rev
[03:24:33] <factor> will put a page up when I get the spp working
[03:26:57] <factor> use a single npn transitor and resistors to amp signal and for isolation
[03:27:01] <factor> per input
[03:27:27] <factor> and so I can put a led on the line without interfering with the signal to the hcip.
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[03:27:50] <factor> need to make sure the hi and lo are well within bounds but seems stable
[03:28:01] <Tom_itx> you like pics ehh?
[03:28:37] <factor> it what i have worked with for years, so comfy with them.
[03:28:58] <factor> and I have a usb pikkit2 programmer.
[03:29:10] <Tom_itx> i got an epic
[03:29:14] <Tom_itx> collecting dust
[03:29:27] <Tom_itx> and ccs c for midrange
[03:29:38] <Tom_itx> (old)
[03:29:45] <Tom_itx> i switched to avrs
[03:30:14] <factor> yes I would like to have avr as well. just dont have the funds to switch to it right now
[03:30:24] <factor> avr work better under linux than pic.
[03:30:43] <factor> pic i am stuck to 16f and 18f chipsets.
[03:31:02] <factor> some say you can use wine , but wine does not use the usb vry well
[03:31:16] <factor> i could compile on wine but the dos files to unix is a pain.
[03:31:30] <factor> gpasm and pk2cmd will work fine for me right now
[03:31:59] <factor> compile and chip programing
[03:32:27] <Tom_itx> i used picbasic for a while
[03:32:31] <Tom_itx> then ccs c
[03:32:55] <factor> I use asm for 16f and c for 18f chipsets
[03:32:55] <Tom_itx> mess with motorola stuff for a bit
[03:33:05] <Tom_itx> 6811 68332
[03:33:09] <Tom_itx> now avrs
[03:33:42] <Tom_itx> oh and a slight sprinkling of fpga for fun
[03:33:44] <Tom_itx> very slight
[03:39:24] <factor> http://paste.pocoo.org/show/395291/ My pic 16f628 program for debounce and single axis bipolar stepper
[03:43:34] <factor> heh 16f684 pic I mean
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[06:56:19] <mrsunshine_> the lathe seems nice but the spindle bearing seems to be worn to crap :P
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[07:00:33] <mrsunshine_> but then im no expert, its not moving back up or down, but if i take the chuck and pull it towards me it moves significantly
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[08:43:17] <Loetmichel> moin
[08:43:53] <Loetmichel> s/moin/mornin'
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[08:47:06] <Loetmichel> *puah* 2,5hours @ work... moved as little as possible... no dry thread left on my body. I WANT AN A/C!
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[12:18:17] <Paragon-WS> Hello Everyone!
[12:18:19] <Paragon-WS> I have a friend that has asked me to mill some carbon fibre for his RC car chassis, but on preliminary googling it appears that this is hazardous. What are your thoughts regarding this?
[12:18:55] <jthornton> flood coolant or water jet
[12:19:20] <Tom_itx> did you get flooded?
[12:19:43] <Tom_itx> it's 50ish here that's about it
[12:20:00] <jthornton> I'm above the high water mark, if I flood there are a whole lot of folks in deep shit
[12:20:25] <Tom_itx> good call
[12:20:56] <jthornton> no real tornado's showed up despite the guy from the weather channel arriving to film one
[12:21:18] <Tom_itx> maybe you should have showed him some home movies
[12:21:26] <Paragon-WS> The little denford starmill does not have this facility, I was thinking of using a spray bottle with water would this suffice and maybe wear a respirator?
[12:21:54] <Paragon-WS> I guess it's a case of minimising dust exposure...
[12:22:16] * jthornton heads upstairs to get ready for work
[12:22:47] <Tom_itx> wear a mask
[12:23:11] <Paragon-WS> Thanks Guys...
[12:27:29] <Tom_itx> or a hazmat suit.. depending on how paranoid you are
[12:31:57] <anonimasu> Paragon-WS: just avoid breathing it in
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[13:20:06] <Valen> use a sucker and make sure it doesn't pass the air through the motor
[13:20:13] <Valen> carbon makes for sparks Paragon-WS
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[13:24:33] <skunkworks> http://www.machsupport.com/forum/index.php/topic,18538.0.html
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[13:25:30] <Valen> I spose EMC/axis is multithreaded by design
[13:26:13] <Valen> though it does raise a question
[13:26:27] <Valen> if you have a stupidly large gcode file and do a rotation or some such
[13:26:43] <Valen> can it cause axis to become non responsive to an estop command? (F1)
[13:26:45] * skunkworks hugs emc again
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[13:28:56] <mhaberler> Valen: no, because axis is not involved in an Estop reaction
[13:29:09] <Valen> it is if you do it by pressing F1
[13:29:18] <mhaberler> task reacts, axis follows - eventually
[13:29:32] <mhaberler> oh, I see
[13:30:18] <Valen> our "estop" button kills power to the servo drives so it doesn't bother us too much but if the action comes from outside of HAL then there may be an issue
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[14:01:47] <KimK> skunkworks: Thanks, Sam. Do you have a copy of this "standard roadrunner file"? (gcode, I presume?)
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[14:02:51] <skunkworks> KimK: I do not. Seen it quite a few times though.
[14:02:52] <skunkworks> KimK: Hi
[14:03:59] <skunkworks> it just mills out a roadrunner shape
[14:04:05] <skunkworks> pretty basic
[14:04:29] <KimK> skunkworks: OK, thanks, thought I'd ask. It's probably available in the same zip file with "trucker mudflap girl".
[14:05:19] <skunkworks> heh
[14:06:19] <skunkworks> wow - everyone is on vacation this week - how am I supposed to get any work done?
[14:06:29] <skunkworks> :)
[14:06:58] <JT-Work> I'm working today but taking the next 4 days off :)
[14:07:00] <KimK> You have to do it all. That's why they timed their vacations that way.
[14:07:51] <KimK> Got something special planned, JT?
[14:07:52] <JT-Work> we are riding the bikes to Memphis this weekend with 2 other couples... :)
[14:08:06] <JT-Work> staying at the Peabody, sounds like fun
[14:08:29] <KimK> OK, enjoy, post pictures later
[14:08:37] <skunkworks> we are driving to montana over the weekend to see the wifes dad...
[14:09:35] <KimK> Pictures from you too, then. Taking the kids?
[14:09:58] <skunkworks> no kids yet
[14:10:18] <KimK> Ah, who am I thinking of? Well, nevermind.
[14:10:23] <skunkworks> heh
[14:10:52] <KimK> No "Are we there yet?" then.
[14:10:56] <JT-Work> ain't thinking of me either... I have grandkids :)
[14:15:14] <KimK> In looking at the 2011 CNC Workshop postings, I see that Ray Henry is scheduled, great! "...EMC Lecture and Demo (1 hour each day) -Ray Henry". Also Ben Fleming, the "DIY EDM" expert and author who I believe was at the 2008 EMC fest in Galesburg.
[14:15:45] <skunkworks> I have not talked to ray in ages.
[14:16:04] <FinboySlick> DIY EDM... Now that sounds very cool.
[14:16:29] <skunkworks> KimK: are you going to the workshop?
[14:17:08] <KimK> FinboySlick: Yes, I think so too, I'm very interested in EDM. Both wire and sinker.
[14:17:57] <KimK> skunkworks: Low on cash, Magic 8-Ball says: "Ask again later."
[14:18:22] <skunkworks> we are not going either. Hoping for a late in the year wichita fest... :)
[14:19:13] <KimK> Yes, that's kind of what I had in mind too, although I would like to see Ray and Ben.
[14:20:27] <skunkworks> we have taked about hosting a small emc fest... but we still have a lot of cleaning up to do.
[14:21:28] <KimK> Great, keep me posted.
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[15:11:56] <Tom_itx> Connor1
[15:12:03] <Connor1> Yea
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[15:12:11] <Tom_itx> could i pester you for the pn on those rotary switches?
[15:12:22] <Connor> yea. one sec.
[15:12:37] <Tom_itx> finally remembered what i wanted :)
[15:12:46] <Connor> http://www.mouser.com/ProductDetail/Alpha-Taiwan/SR2612F-0112-21R0B-D8-N/?qs=yA6kp8fx8Y7S2TB5GvzfgQ%3D%3D
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[15:16:22] <Connor> That work for you ?
[15:31:31] <Tom_itx> i'll have to find another one since i'm ordering from digikey
[15:31:44] <Tom_itx> mouser doesn't stock some other stuff i need
[15:33:24] <Connor> Oh. Sorry.
[15:38:47] <Connor> I found one on digikey a while back that was similar.. more $$.. let me find it again
[15:39:00] <Tom_itx> mouser may have what i need
[15:39:05] <Tom_itx> i'm checking
[15:44:43] <Connor> okay. Digijey has this one from C&K CKC7001-ND, CKC7002-ND, CKN6042-ND, CKN10200-ND, CKN9451-ND
[15:44:56] <Connor> you need to look at the datasheet to the main diff.
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[16:26:58] <syyl> finaly got my mesa 5i20 \o/
[16:28:37] <Loetmichel> re @ home
[16:34:59] <skunkworks> syyl: doesn't it smell good?
[16:35:08] <syyl> yeah :D
[16:35:09] * skunkworks likes the smell of new electronics
[16:35:47] <Tom_itx> darn junkies
[16:36:09] <skunkworks> I can quit any time!
[16:36:15] <syyl> my mill was down for almost two weaks, while waiting for the mesa card
[16:36:17] <Tom_itx> uh huh
[16:36:23] <syyl> i want to make chips :D
[16:36:38] <Loetmichel> skunkworks: you think?
[16:36:40] <Loetmichel> ;-)
[16:36:44] <anonimasu> mine has been down for 2 and stuff is piling -_-
[16:37:38] <Loetmichel> mine is ready to run but i am to damn lazy to peel the old Workpiece off and do something new....
[16:47:06] <ssi> I should bust into my g0704 tonight
[16:47:17] <ssi> it's so hard to find the motivation to start something that big :(
[16:51:48] <Connor> If you don't have the motivation, just ship it to me.. I'm still waiting for mine.
[16:52:03] <syyl> :D
[16:52:19] <syyl> so
[16:52:29] <syyl> lets see if i can get the mesa up and running
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[17:03:30] <Tom_itx> anonimasu thanx for the files
[17:03:43] <JT-Shop> I have an aux board on my mill with a couple of these http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=497-2357-5-ND
[17:03:52] <JT-Shop> and a few inline resistors
[17:04:11] <JT-Shop> my spindle safe light is connected to it but does not work
[17:04:18] <JT-Shop> is it some kind of switch?
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[17:06:51] <Tom_itx> transistor array
[17:07:04] <JT-Shop> some jackleg connected the light circuit to a N/C contact on the push button instead of the light
[17:09:27] <Tom_itx> maybe he thought that meant 'numeric control'
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[17:12:12] <JT-Shop> I'm thinking that not much thinking was going on at the time he put it in...
[17:13:07] <Tom_itx> spindle-on sorted out
[17:13:12] <JT-Shop> I might just change them to see if I get some voltage at the light to finger out what voltage it might be
[17:13:17] <JT-Shop> cool
[17:14:23] <Tom_itx> wondering if a push on, push off on the pendant for spindle control is a bad idea
[17:15:19] <IchGuckLive> ej folks today one of y students did a endlos while loop how can i stop this from loding ?
[17:19:56] <JT-Shop> smack his hand with a ruler
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[17:20:34] <JT-Shop> Tom_itx: for jogging the spindle?
[17:24:12] <Tom_itx> for manual control mainly
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[17:24:37] <Tom_itx> like if i'm making a jig or something and need to drill some dowel pin holes or something
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[17:28:24] <willburrrr2003> Finished getting my home and limit switches on the Z axis of my lathe, works great !! I will get the sitches mounted on my X axis tonight. Each day my macine gets a little better, and easier to use :D
[17:29:11] <willburrrr2003> Once I get the home and limit on my x, then I will get my homing sequence set up.
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[17:30:04] <willburrrr2003> If I have relative coordinates set, how will that affect my homing?
[17:33:52] <JT-Shop> not at all homing is done in machine coordinates
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[17:37:34] <willburrrr2003> so If I home my z axis, with relative coordinates set, then it would go to my home switch and back off to the relative z0.0 instead of machine z0.0?
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[17:38:00] <ssi> anyone have any idea what it costs to hire a rigger to move a smallish lathe
[17:38:03] <ssi> I think it's a 14x36
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[17:38:30] <FinboySlick> ssi: beer.
[17:38:40] <ssi> got a phone number? :D
[17:39:16] <FinboySlick> ssi: Hah, I weigh about 120 pounds.
[17:39:27] <FinboySlick> Your lathe is probably more than twice my weight.
[17:39:42] <willburrrr2003> just trying to geta feel for the sequencing of the homing, I can see the need to home to a relativecoordinate when working a part.
[17:40:09] <ssi> I think it's probably more than ten times your weight
[17:40:10] <ssi> maybe twenty
[17:40:23] <ssi> http://atlanta.craigslist.org/atl/tls/2372551903.html
[17:41:20] <FinboySlick> ssi: You'll need lots of beer, and you want to only give it after it's been moved. Takes more brain than strength to move these kinds of things.
[17:41:44] <FinboySlick> It's a beauty though.
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[17:44:48] <JT-Shop> willburrrr2003: you set an offset to your tools and part not home to them
[17:49:04] <willburrrr2003> JT-Shop, I understand that I set my offsets to mytools and part, but if I home the axis while I have a relative coordinate system active the machine touches its home switch but goes from there all the way to the relative coordinate z0.0 insted of the machine z0.0 as I was expecting it to. I was just wondering if I didnt set up my homing correctly. Once I cleared the relative offsets, it homed to machine z0.0 just fine.
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[17:51:07] <JT-Shop> a G54 type of offset?
[17:51:55] <JT-Shop> or a g92?
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[17:53:12] <JT-Shop> http://www.linuxcnc.org/docview/html/gcode_main.html#sub:G92,-G92.1,-G92.2,
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[17:53:26] <willburrrr2003> Not sure, it was the default offset whe I clicked the touchoff button. It then asked me what the axis position was currently for the axis. I only realized the night before last, that there were more options under the touchoff button.
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[17:54:57] <JT-Shop> the top one is (what ever axis is selected) G54 offset and should not have any effect on homing AFAIK
[17:55:35] <JT-Shop> I home my lathe with G54 offsets on Z all the time and it always goes to the machine origin
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[17:56:00] <willburrrr2003> Ok, thats what I was wanting to know...I will check it over gain tonight and see what I did wrong
[17:56:38] <JT-Shop> click on Show Machine Position to see
[17:56:57] <willburrrr2003> Ok, will do
[17:57:33] <JT-Shop> you must have been looking at Show Relative Position which shows the position with the offset even if your at the machine origin
[17:58:50] <willburrrr2003> I was looking at relative position, true ...but the machine went to relative z0.0 instead of actual z0.0....
[18:01:55] <willburrrr2003> I will talk with myfriend that was helping me, and see if he remembers the sequence of events...maybe I am not remembering things correctly. It's possible the stop at the relative z0.0 was on a g1 move and not the home sequence, was pretty late and still learning lots....
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[18:04:50] <JT-Shop> yea, it had to be something else
[18:06:41] <willburrrr2003> JT-Shop, The more I think about it...the more I think your right ... on a side note, do you have a routine for NGCGUI to do multiple passes for a taper cut? Like if I want to cut a taper into virgin roundstock...
[18:07:30] <JT-Shop> no, but it would be a simple combination of OD and taper ones... I need one too
[18:08:11] <JT-Shop> I need to figure out an easier way to define the taper and have a lead in built in as well
[18:09:28] <willburrrr2003> what language are the NGCGUI subroutines written in? I may hve to start giving a shot at writing one
[18:11:53] <JT-Shop> g code
[18:12:15] <JT-Shop> http://www.linuxcnc.org/docview/html/gcode_main.html#r3_1
[18:12:34] <JT-Shop> only the header comments are special for ngcgui
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[18:14:19] <willburrrr2003> sweet, thanks for the link JT
[18:17:52] <JT-Shop> np
[18:26:06] <JT-Shop> willburrrr2003: I have recently added peck drilling to my drill sub :)
[18:26:43] <ssi> JT-Shop: you should publish your sub collection all in one place :D
[18:28:52] <JT-Shop> I'm putting them on my web site as time allows
[18:29:43] <JT-Shop> it would be neat to have some graphics for each one showing what the settings that are not obvious are
[18:33:01] <JT-Shop> willburrrr2003: to start just make a simple one with one or two parameters then work on a sub with a loop
[18:34:11] <ssi> I have a program written that completely machines the shank end of a TTS holder now using subs
[18:34:14] <ssi> and it works pretty well
[18:34:31] <ssi> I'm making them out of 1018 crs
[18:35:05] <ssi> while it's machining down the shank diameter, it cuts really really nicely and leaves a great finish
[18:35:09] <ssi> and then on the finish pass, it's ugly
[18:35:10] <ssi> hooray!
[18:40:28] <JT-Shop> too light of a cut?
[18:40:41] <JT-Shop> wrong insert?
[18:40:46] <JT-Shop> wrong speed?
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[18:41:48] <cradek> carbide doesn't do finish passes. cut your final pass just as deep as the rest that are giving good finish. sometimes you have to be very brave.
[18:42:23] <cradek> with sharp HSS you can cut a finish pass of .001 or less. carbide can't do that. you can't use the same techniques.
[18:45:08] <JT-Shop> :)
[18:46:13] <anonimasu> or get a carbide finishing bit
[18:46:46] <anonimasu> ssi: sounds like your cut is too small from what you describe
[18:47:23] <archivist> there are ground finish carbide tips that are sharper too
[18:47:44] <anonimasu> yep
[18:47:46] <JT-Shop> I use them for aluminum
[18:47:50] <JT-Shop> very nice
[18:47:58] <anonimasu> if you have a small lathe it might make sense to only use thoose
[18:48:17] <mrsunshine_> ough, the lathe almost dropped on my foot
[18:48:27] <anonimasu> I flipped mine :)
[18:48:36] <mrsunshine_> lifted it the same way the guy i bought it from did, and blam, the foot of it came down .. weights about 100kg
[18:48:39] <archivist> almost is no problem!
[18:48:43] <mrsunshine_> and the lathe went berserk :P
[18:48:49] <anonimasu> my controller caught it safely..
[18:48:54] <anonimasu> :D
[18:49:32] <mrsunshine_> now the problem is lifting the lathe from the floor to its bench
[18:49:40] <mrsunshine_> gonna need 2 strong men more then me to lift it :/
[18:49:42] <mrsunshine_> heavy thing
[18:50:01] <mrsunshine_> and then dismantle it to get to the spindle bearings to replace them ...
[18:50:17] <archivist> jack and pack to lift
[18:50:54] <mrsunshine_> jack and pack ?
[18:51:33] <archivist> one never lifts by more than a few inches that way
[18:51:35] <mrsunshine_> 3 men will be able to lift it, we can do it by two but its kinda off balance when the motor is way off to the side
[18:51:49] <mrsunshine_> archivist, i dont get it ... thats why i asked "jack and pack?" ...
[18:51:52] <mrsunshine_> what do you mean by it ?
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[18:52:41] <archivist> cant think of a one liner to explain in irc, that better than jack and pack
[18:53:04] <mrsunshine_> well jack it up, put stuff under it, jack it up more ?
[18:53:10] <archivist> yes
[18:53:54] <archivist> pallets or similar possibly
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[18:54:36] <archivist> depends on space and availability
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[18:56:17] <cradek> can you pull it up a ramp?
[18:56:46] <archivist> builders planks and stacks of pallets
[18:57:42] <JT-Shop> here is how you move a 6000 lb. VMC that way http://gnipsel.com/shop/unload-308/unload-308.xhtml
[18:57:49] <mrsunshine_> cradek, nop, no space for that =)
[19:01:17] <archivist> I tend to do all my moving on my own because I want to do it slowly and carefully, I use a lever to jack a lot of the time
[19:01:57] <JT-Shop> I'm the same as archivist
[19:02:29] <JT-Shop> the picture sequence in the link took 2 1/4 days
[19:02:52] <archivist> a lever and brick/lump can be left as a brake when on rollers
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[19:04:38] <JT-Shop> http://gnipsel.com/shop/unload-308/unload-308-09.xhtml
[19:07:27] <archivist> using the digger as a brake is cheating !
[19:07:43] <JT-Shop> LOL and a solid bit to pull from
[19:08:04] <JT-Shop> I thought you might like that one
[19:08:31] <cradek> rent a forklift, you cheapskate
[19:09:06] <archivist> nah, forking dangerous to use a forking fork lift
[19:09:41] <JT-Shop> forklifts don't work well on gravel
[19:09:49] <cradek> ah, very true
[19:09:59] <cradek> or dirt
[19:10:03] <archivist> metal slides on metal so easily
[19:10:35] <Jymmm> JT-Shop: Nor bombs... http://media.photobucket.com/image/recent/deparnell/forklift-bomb-thumb.gif
[19:12:13] <JT-Shop> bet he don't work there anymore
[19:12:29] <JT-Shop> and that had to hurt
[19:12:30] <Jymmm> lol
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[19:14:28] <willburrrr2003> JT-Shop, peck drilling would be nice to have :) I will start simple, and get more advancd as I get better doing it. I have concept in mind for my multi-pass taper subroutine and will give a shot at making it work.
[19:14:41] <JT-Shop> cool
[19:15:06] <JT-Shop> just cut some air first :)
[19:15:11] <willburrrr2003> Jt-Shop, I also love your Idea of a graphic showing what the setting do :D
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[19:17:52] <bzzzz> is it christmas yet
[19:20:16] <JT-Shop> http://s47.photobucket.com/albums/f163/johnplctech/Hardinge/?action=view&current=hardinge03.jpg
[19:20:34] <andypugh> It's after the Rapture, didn't you hear? No more Christmasses. It seems that none of my neighbours were taken up, thiugh.
[19:20:36] <JT-Shop> we just pulled the CHNC off the trailer into the garage then wheeled it over
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[19:26:22] <archivist> because of the leg spacing I needed a plank roller plank sandwich to get the southbend in the garage many years ago
[19:27:08] <JT-Shop> you can move almost anything that way :)
[19:27:42] <syyl> my mesa card works :D
[19:27:50] <syyl> was almost TO easy to setup
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[19:30:46] <JT-Shop> that's a good sign
[19:33:08] <Tom_itx> just tell me you can't do it and i'll show you how :)
[19:33:26] <Tom_itx> JT n sons movers.
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[19:34:32] * JT-Shop has no sons only daughters
[19:34:52] <JT-Shop> yep don't tell me I can't do something...
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[20:07:02] <grommit> Is cradek around at the moment?
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[20:19:08] <skunkworks> andypugh: what cabling did you end up finding for you resolvers?
[20:23:05] <andypugh> Some random individually shielded twisted-pair from eBay. This one, it appears: http://uk.farnell.com/alpha-wire/6010c-100/cable-22awg-scrn-3pair-30-5m/dp/1235617
[20:25:31] <skunkworks> THanks!
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[20:30:41] <JT-Shop> andypugh: did you mean to say you can add buttons on the right with pyvvp?
[20:31:12] <andypugh> Yes. Did I get my left and right confused again?
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[20:32:03] <andypugh> He's offline, hopefully I got away with it :-)
[20:33:02] <JT-Shop> :)
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[20:43:56] <grommit> Can anyone tell me what the relationship is between stepgen.N.steplen, stepgen.N.stepspace, stepgen.N.dirsetup and stepgen.N.dirhold is?
[20:44:40] <grommit> I am reading the man page here: http://www.linuxcnc.org/docs/2.4/html/man/man9/stepgen.9.html
[20:44:50] <grommit> And it seems to be flat out wrong
[20:45:28] <grommit> I have a scope on my step output and changing stepgen.N.steplen and stepgen.N.stepspace has no effect.
[20:45:35] <andypugh> grommit: http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/catid,32/id,10041/lang,english/
[20:46:45] <JT-Shop> http://www.linuxcnc.org/docview/html/hal_rtcomps.html#sec:Stepgen
[20:47:19] <alex_joni> http://juve.ro/blog/photography/01306440801
[20:47:19] <JT-Shop> The parameters are in nanoseconds, but will be rounded up to an integer multiple of the thread period for the threaed that calls make_pulses()
[20:47:50] <grommit> It just does not operate that way.
[20:47:57] <JT-Shop> alex_joni: neat!
[20:47:58] <grommit> I have type=0 set.
[20:48:20] <grommit> Changing steplen and stepspace has no effect.
[20:48:35] <JT-Shop> The parameters are in nanoseconds, but will be rounded up to an integer multiple of the thread period for the threaed that calls make_pulses()
[20:48:43] <grommit> looking at some other's config (here in my shop) they have steplen set to 1 and stepspace set to 0
[20:48:52] <grommit> (for type 0)
[20:50:46] <JT-Shop> alex_joni: where do the steps go?
[20:56:55] <tom3p> alex_joni, quote from Douglas Adam's Long Dark Teatime of the Soul "Tell you what, tell him to stuff it. Go to Tenerife." There was an idea. Tenerife.
[21:01:12] <andypugh> alex_joni: I know it well. I get paid to drive up and down that mountain :-)
[21:08:11] <JT-Shop> that's got to be fun
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[21:37:09] <alex_joni> andypugh: lucky you ;)
[21:37:25] <alex_joni> tom3p: sounds about right
[21:37:35] <alex_joni> JT-Shop: just some observation point
[21:39:20] <alex_joni> steplen = 1 means you'll get 1 nsec rounded up to one period.. so one period long
[21:39:42] <alex_joni> stepspace = 0, means your'll get a step every pulse (but you need to use reset)
[21:39:53] <alex_joni> that is also called double stepping
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[22:21:58] <grommit> Is the IRC no longer archived? I see the last date in the archives is 2/11/2011...
[22:22:21] <Tom_itx> yup
[22:22:43] <Tom_itx> there are 2 logger bots if you see
[22:22:54] <andypugh> logger[psha]:
[22:34:08] <JT-Shop> any ideas on how to write a G72 lathe roughing cycle based on a profile
[22:34:42] <andypugh> As an ngcgui?
[22:34:49] <JT-Shop> yea for now3
[22:34:52] <JT-Shop> now
[22:35:12] <andypugh> Seems like an interesting puzzle...
[22:35:42] <JT-Shop> right now I'm using a G92 but that does foul up CSS
[22:37:16] <andypugh> So, you feed it a profile as a series of G1/G2/G3 moves and a starting diameter, and it roughs it out, leaving a bit for a continuous finishing cut?
[22:37:36] <JT-Shop> yea
[22:38:17] <JT-Shop> right now I'm just stepping over the profile with G92 but even if your 1/2" off center and the final spot is center you get max rpm
[22:38:31] <JT-Shop> if that makes any sense
[22:39:08] <andypugh> I guess you would initially offset the profile by the allowance, then start roughing, stopping when the controlled point intersects the profile (ie, when (x,z) satisfies the equation of one of the curves)
[22:39:38] <JT-Shop> that sounds right
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[22:40:24] <JT-Shop> http://www.jssmdx.com/Reference/GCodeLathe.htm
[22:40:31] <andypugh> Then you need to se if that line "reappears" anywhere, then try to get to there allowing for tool back angle..
[22:41:18] <JT-Shop> I think there is 3 different one, some smarter that others as far as the profile goes
[22:41:26] <andypugh> Actually, you find all intersections of the roughing pass with the offset profile, start a cut at every even intersection and stop at every odd one.
[22:45:17] <JT-Shop> I can't seem to picture that in my head :/
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[22:50:22] <JT-Shop> http://imagebin.org/155335
[22:52:58] <andypugh> With that profile, the "even" intersections are all number 0, (the start point). The ends are all intersection 1. I was thinking of the general case with re-entrant curves.
[22:54:21] <JT-Shop> I guess a smart one would follow the profile once it reaches the rough depth to the last intersection
[22:55:04] <andypugh> It would probably follow the offset curve, yes, so that the finishing pass cuts a constant depth.
[22:56:28] <andypugh> What might work would be to use the interpreter to run a dummy run of the profile, and note all the (X,Z) for X=cut multiple.
[22:57:05] <JT-Shop> http://imagebin.org/155337
[22:57:08] <andypugh> What language do you use for ngcgui?
[22:57:21] <JT-Shop> g-code
[22:57:59] <andypugh> I doubt you can do it then.
[22:58:30] <JT-Shop> need some kind of python plug in?
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[22:59:16] <JT-Shop> or just write one for EMC :)
[22:59:19] <andypugh> You need some way to interpret the profile G-codes and store the start and end points, I think.
[22:59:36] <JT-Shop> yea, that makes sense
[23:00:01] <andypugh> I think programming it in C or Python would be a whole heap easier than writing it in G-code. G-code is a terrible programming language.
[23:01:24] <JT-Shop> ngcgui is in tcl, which I know less than nothing about :/
[23:02:25] <andypugh> I think I would do it something like this:
[23:02:44] <andypugh> First work out the X increments.
[23:03:26] <JT-Shop> from start X, end X and depth of cut?
[23:03:44] <andypugh> Then follow the profile, segment-by segment, making a list of each Z where X = one of the increments.
[23:05:07] <andypugh> If you get to the end of the profile with an even number of Zs, add the end Z
[23:05:25] <andypugh> (I forgot, the first Z is Z0)
[23:06:39] <andypugh> You might want to make an entry cut at G1 speed at the tool back-angle at the start of each cut.
[23:07:14] <andypugh> Darn! I don't _need_ another project.
[23:07:45] <JT-Shop> if you use G41/42 can't you just ignore the tool geometry?
[23:09:05] <andypugh> Does that work for lathes?
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[23:10:31] <JT-Shop> yes
[23:10:36] <andypugh> It only takes into account tool diameter, I thought. No protection against back-gouging on plunge cuts.
[23:11:01] <JT-Shop> the tool orientation is taken into account on the lathe
[23:11:35] <JT-Shop> http://www.linuxcnc.org/docview/html/lathe_lathe-user.html#r1_2
[23:11:43] <andypugh> Or are you just assuming that the tool chosen can follow the whole profile?
[23:11:59] <JT-Shop> you can see the difference on position 2 and 6 which are common
[23:12:27] <andypugh> Yes, but does G41 use those?
[23:12:28] <JT-Shop> yea, the machinist has to use a bit of his noodle
[23:12:32] <JT-Shop> yes
[23:12:39] <JT-Shop> I've proved it
[23:12:51] <JT-Shop> quite amazing the developers
[23:14:30] <JT-Shop> you can see the center one for mills the control point is in the center of the radius where the lathe ones is on the edge
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[23:14:55] <andypugh> But what does it do? I can imagine it might keep the tool truly tangent to a G2 move. But that isn't really what I was talking about.
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[23:15:47] <JT-Shop> say you use position 2 the offset is applied to the top and left, where as position 6 the offset it applied to the top only
[23:16:39] <andypugh> I was talking in terms of extrapolating the tool flanks to infinity, and not allowing them to touch the profile.
[23:17:06] <JT-Shop> hmmm I see
[23:17:37] <andypugh> Then you could run the same code with a Pos2 and a Pos1 tool, and automagically machine the full profile.
[23:17:45] <JT-Shop> that does complicate it somewhat to try and do that as you have to know both orientation and front and back angle
[23:18:02] <andypugh> The data is in the tool table.
[23:18:03] <JT-Shop> that would be neat
[23:18:32] <JT-Shop> but the front angle and back angle are interchangeable
[23:18:48] <JT-Shop> ie, you can use either one for front or back
[23:19:12] <andypugh> Separate entries in the tool table.
[23:19:13] <JT-Shop> no matter what my graphic says
[23:19:49] <andypugh> Anyway, time to sleep.
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[23:20:02] <JT-Shop> ok, thanks for thinking about it
[23:20:41] <JT-Shop> goodnight
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[23:32:00] <PCW> Gensor: http://freeby.mesanet.com/ps.pdf
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