#linuxcnc | Logs for 2013-11-17

[01:54:27] <_DJ_> moin
[02:21:20] <MacGalempsy> hi dj
[02:28:06] <RyanS> can pretty all 415v 3p motors be fitted with a VFD, or there are some caveats?
[02:28:24] <archivist> yes I told you already :)
[02:28:42] <archivist> some dont have the wiring brought out
[02:44:23] <RyanS> when... I must be getting forgetful in my old age
[03:08:46] <Jymmm> Ok, this has the potential to be scary... http://www.youtube.com/watch?v=LH8G7atCFSQ
[03:08:47] <RyanS> hey archivist, can pretty all 415v 3p motors be fitted with a VFD? :P
[03:08:48] <Tecan> (LH8G7atCFSQ) "How to turn a drill into a monster shotgun!" by "JoergSprave" is "Tech" - Length: 0:04:29
[03:15:26] <Jymmm> How to repurpose old saw blades... http://www.youtube.com/watch?v=-q5URmC5BMk
[03:15:27] <Tecan> (-q5URmC5BMk) "Mini Pumpgun Pistol + Circular Saw Blades - Reloaded!" by "JoergSprave" is "Tech" - Length: 0:06:07
[03:31:35] <RyanS> Look at this, they booted the poor welder outside http://www.army.mod.uk/rolefinder-content/29/equipment.jpg?h=u8RwGifG7NOMRDZ8tQMfxAbR3J4= "weld outside on the ground and watch out for snipers"
[04:20:11] <PasstScho> maybe the welding helmet is bullet proof ;)
[04:39:15] <_DJ_> hi alex
[04:39:44] <sabotender> moo
[04:39:58] <_DJ_> hi mr. moo ;)
[04:53:23] <sabotender> hi _DJ_
[05:34:09] <RyanS> woohoo, local industrial insolvency sale!
[05:34:54] <MacGalempsy> where?
[05:35:28] <RyanS> Melbourne, Australia http://www.graysonline.com/sale/3004295/engineering-and-toolmaking/unreserved-engineering-closure?spr=true
[05:37:13] <RyanS> damn 20 biddrs on RF30
[05:43:20] <RyanS> What an automatic screw machine
[05:54:52] <kengu> it screws you automagically (; huge amout of machinery there but the prices should rise
[05:56:47] <archivist> I bet the screw machines are going to the scrap man
[05:57:22] <archivist> these days screws are rolled thread
[05:59:16] <kengu> is there a "standard wiring protocol" for 7i76 and field io (limits x+, x-, coolant) or something that I should note when assigning those to TB6 pins
[06:00:18] <RyanS> droooool HSS tap&die set, looks completely unused
[06:03:06] <RyanS> Wonder what sort of operation. They were running 22 automatic screw machines
[06:03:38] <archivist> hint screw makers
[06:04:56] <RyanS> I thought they were the forerunner to cnc swiss lathes
[06:05:38] <RyanS> ie they don't make screws
[06:05:59] <Loetmichel> brb, win7 wants update-reboot ;-)
[06:07:49] <RyanS> I can see the logic in including the die grinder :P http://www.graysonline.com/lot/0131-3004295/engineering-and-toolmaking/quantity-of-4-dial-indicators
[06:08:20] <archivist> often writes of wikipedia like to adjust history, they were invented for screws, the swiss auto for long shafts, the cam auto for general automated lathe
[06:09:06] <RyanS> ok
[06:09:34] <archivist> eg a wood screw was made on a screw machine
[06:10:28] <archivist> that dti lot is just ok for the price for two comparator stands
[06:11:10] <archivist> one at the rear looks like a go/no go setup
[06:12:34] <RyanS> , although prob. not necessary for hobby engineering
[06:13:17] <archivist> exactly, if too accurate like http://www.collection.archivist.info/archive/DJCPD/PD/2013/2013_10_13_comparator/IMG_1675.JPG you will never use it
[06:13:39] <archivist> I only play with mine comparing standards
[06:15:51] <RyanS> ooo 18k RPM bench drill
[06:17:34] <Loetmichel> RyanS: so what? had one here that made 30krpm... for drilling PCBs ;-)
[06:21:27] <RyanS> but but, but
[06:23:56] <archivist> I had a bent spindle on my fleabay high speed drill http://www.collection.archivist.info/archive/DJCPD/PD/2012/2012_07_09_Pollard_9FX_drill/IMG_1207.JPG
[06:24:40] <archivist> I just reground the chuck taper to make it right
[07:13:57] <MacGarage> morning
[08:54:34] <JT_Shop> morning
[08:54:55] <Tom_itx> nice sunny one
[09:43:35] <MacGalempsy> it is nice out today. we left the screen door open all night
[09:47:43] <Jymmm> http://www.youtube.com/watch?v=_xCbal2YyaE
[11:42:37] <IchGuckLive> hi all
[11:44:00] <hiroshima5> hi
[11:45:37] <IchGuckLive> hiroshima5: did jesus returned mail
[11:46:13] <hiroshima5> i didn't write him
[11:46:30] <IchGuckLive> so did you some redesign
[11:46:30] <hiroshima5> i'm been doing other things
[11:46:44] <hiroshima5> i change all the profiles
[11:46:56] <hiroshima5> i check them with cype
[11:47:05] <hiroshima5> and with 40x40mm 2mm thick
[11:47:08] <hiroshima5> is enough
[11:47:44] <IchGuckLive> good for your pocket
[11:47:51] <IchGuckLive> wallet also
[11:48:11] <hiroshima5> i've changed hiwin profile
[11:48:15] <IchGuckLive> so now the big dropdown of the servos towards steppers and you are in
[11:48:16] <hiroshima5> for supported shaft
[11:48:59] <hiroshima5> maybe the thesis director has other servos
[11:49:07] <hiroshima5> with analogic drives
[11:49:20] <hiroshima5> what can be controlled by a mesa fpga
[11:49:28] <IchGuckLive> oh you woudt also go for servos on this system
[11:49:54] <IchGuckLive> Why its 5m/min system so its not nessesary to spend that kind of money
[11:50:11] <hiroshima5> if he has them already bought and unused
[11:50:25] <IchGuckLive> ok
[11:50:32] <hiroshima5> its more earned money than wasted
[11:50:37] <hiroshima5> but i think like you
[11:50:38] <IchGuckLive> i woudt sell it and build a better one
[11:50:55] <hiroshima5> you know how public universities manage the money
[11:50:58] <hiroshima5> at least on spain
[11:51:08] <IchGuckLive> i know
[11:51:16] <IchGuckLive> its a hell of a miss
[11:51:34] <hiroshima5> i only want an easy combination
[11:51:36] <IchGuckLive> and then it is in the corner somwhere odding for years
[11:51:38] <hiroshima5> of motor and drives
[12:42:31] <t12> ~.
[12:42:38] <t12> er
[12:43:25] <sono> it's alive!
[12:46:00] <terabyte-> congratulations
[15:36:57] <Jymmm> JT_Shop: Home made rocket fuel... http://www.youtube.com/watch?v=yUYxk-y-tU8
[15:40:57] <Tom_itx> guys around here make their own
[15:41:04] <Tom_itx> solid
[15:41:14] <Jymmm> JT_Shop: DIY Slow burning fuse http://www.youtube.com/watch?v=w-H02hwvVgI
[15:41:25] <Tom_itx> you sure love youtube
[15:42:18] <Tom_itx> last 5 posts were youtube links
[15:42:29] <Jymmm> You learn new stuff very quickly and can rewind
[15:42:58] <Tom_itx> i blew my limit on bits this month
[15:43:02] <Tom_itx> over 500G
[15:43:19] <Jymmm> cellphone?
[15:43:23] <Tom_itx> isp
[15:43:50] <Jymmm> ouch, limited only by BPS here
[15:44:21] <Tom_itx> sent me a couple nasty emails but that's about it
[15:44:39] <Jymmm> iirc I have 18/2
[15:45:00] <Tom_itx> 25/5 maybe
[15:45:26] <Tom_itx> i've never really looked
[16:27:02] <_DJ_> gn8
[18:08:47] <FreezingCold> Why isn't LinuxCNC just a Debian or Ubuntu package...?
[18:09:04] <Jymmm> Needs a RTOS Kernel
[18:09:35] <FreezingCold> er, linux-rt?
[18:10:26] <FreezingCold> Pretty sure literally every distro supports that
[18:16:10] <cradek> currently our released versions use rtai, which we have been using for years and is harder realtime than linux-rt. There is ongoing work to open up to more realtime platforms in the future, but for controlling machinery today, rtai is what you want. And linuxcnc is distributed as a debian package - if you want sim mode (no hardware control) no special kernel is needed and you can just install it.
[18:16:42] <MacGalempsy> evening
[18:44:34] <andypugh> goodnight chaps
[19:02:27] <PetefromTn> Good evening folks...
[19:27:48] <Jymmm> Who needs VFD's when you have THE SCARIAC!!! http://www.youtube.com/watch?v=P9UjxG8sN1c
[19:27:49] <Tecan> (P9UjxG8sN1c) "The Scariac (Poor Mans Variable Power Controller)" by "Grant Thompson - "The King of Random"" is "Tech" - Length: 0:08:46
[19:37:16] <PetefromTn> LOL I've seen similar videos before. its interesting that much is clear dunno if I would want to try it tho.
[21:20:30] <Felix29> does anybody here have experience with dc motor rpm feedback loops? (cnc spindle motor)
[21:24:46] <pcw_home> Typically a PI velocity loop is used (and things are a lot easier with 4 quadrant motor control)
[21:25:29] <Felix29> yeah, unfortunately I already have a DC motor
[21:25:43] <Felix29> So it's PI and not PD?
[21:26:08] <Felix29> I was thinking about that. But is this better done in analog or a microcontroller?
[21:28:37] <pcw_home> Yes PI (motor type does not matter too much)
[21:30:11] <pcw_home> LInuxCNC can run th PI loop
[21:31:49] <pcw_home> typically spindle response times are pretty slow so PID done in a 1 KHz servo thread is plenty fast enough
[21:32:46] <Felix29> Well, that sounds promising. Now I just need to get an encoder hooked up :)
[22:31:26] <somenewguy> does anyone have any idea how difficult it would be for an idiot like myself to setup some kind of routine/script/mcode or whatever to test my home locations?
[22:31:45] <somenewguy> The gist of it is I want to with a single button push "home" my axis, but not re-set my location
[22:32:01] <somenewguy> I just want it to touch off the home switches and report what location they trigger at
[22:32:10] <somenewguy> so if everything is peachy-keen, they should report 0 0 0
[22:32:54] <somenewguy> obviously this must be doable, but I don't konw if it is a half an hour worth of work, or two or three days worth of work
[22:41:34] <Tom_itx> axis has a home button already
[22:41:58] <Tom_itx> uses the homing order you set up in the ini
[22:44:11] <Tom_itx> HOME_SEQUENCE = 0
[22:44:15] <Tom_itx> would home first
[22:48:41] <somenewguy> ok but I don't want it to home
[22:48:49] <somenewguy> this owuld be a purely "inspection" kind of operation
[22:49:28] <somenewguy> I do not want it to change any values or settings
[22:49:44] <somenewguy> I just want a quick and painless way to see what location the home switch triggers at
[22:50:12] <somenewguy> and it sounds simple enough to be a good first program to cut my teeth on
[22:51:05] <somenewguy> the overall goal is to be able to emperically test the repeatability of home switches with minimal effort, as well as simplify testing for lost steps
[22:56:23] <somenewguy> does that make sense? What would you even call the thing I want to write?
[22:56:39] <somenewguy> a script? a custom mcode?