#emc-devel | Logs for 2009-09-23

[07:48:02] <micges_work> cool
[12:09:29] <jepler__> jepler__ is now known as jepler
[20:58:02] <alex_joni> hi seb
[20:58:19] <seb_kuzminsky> hello
[20:59:07] <alex_joni> long time no see(talk)
[21:00:09] <cradek> seb_kuzminsky: my mill now has two 5i20 in it - 4 encoders on one, 1 encoder on the other, and hm2 works right
[21:01:24] <seb_kuzminsky> oh good :-)
[21:01:39] <cradek> I was pleased
[21:02:04] <cradek> but I had to read the man page to see how to install the second firmware!!1!
[21:02:04] <cradek> haha
[21:02:09] <cradek> ... it was even right
[21:02:39] <cradek> that sure is flexible now.
[21:03:00] <seb_kuzminsky> it aint pretty but it works ;-)
[21:03:15] <seb_kuzminsky> but why not run all 5 encoders on one 5i20?
[21:04:24] <alex_joni> probably needs the extra IO anyways
[21:04:28] <cradek> 4 of them are on a 7i33, the other is a jogwheel and it was just more convenient physically to wire it to the second card which controls all the other front-panel stuff
[21:04:53] <cradek> yeah the second card is just a bunch of IO other than that jogwheel
[21:05:25] <cradek> also, I learned that opto22 inputs are WAY too slow for a jogwheel
[21:06:43] <seb_kuzminsky> makes sense
[21:06:52] <seb_kuzminsky> (the wiring consideration, i mean)
[21:07:00] <cradek> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190336630813
[21:07:04] <cradek> ^ the mill has three of these guys now
[21:23:03] <jepler> cradek: what did you do, use jumpers instead of an opto?
[21:23:26] <cradek> yes I used wire - not isolated
[21:23:43] <cradek> ran the wheel off the same pc power the optos run on
[21:23:56] <cradek> it's marked 12v but seems to work on 5
[21:24:25] <cradek> I've wired the resolver board to the spindle but not yet to the mesa
[21:27:55] <jepler> looks like the speed is highly dependent on the I/O module. This list of 4 G4IDC5xx parts ranges from .1ms to 10ms turn-off time..
[21:28:25] <cradek> interesting - would be nice if I could get a couple faster modules for that.
[21:28:47] <jepler> not 100% sure I'm looking at the right stuff: http://www.opto22.com/site/pr_details.aspx?cid=4&item=G4IDC5 -- the fast one is G4IDC5B
[21:28:52] <cradek> I just bought some G4-IDC5D - I'm out
[21:29:08] <jepler> D is middle speed, 1.5ms turn-off time
[21:29:23] <cradek> yeah that's it
[21:29:43] <cradek> hm, maybe if I look through mine I have some fast ones I could shuffle around
[21:30:00] <cradek> I didn't even consider that they might be different
[21:31:18] <cradek> nope I bet mine are all D because they say 2.5-28v on them
[21:34:12] <jepler> seems like you should be OK up to 2.5ms per half cycle = 2 revs/second
[21:34:32] <jepler> but maybe you like to jog faster than that
[21:35:16] <cradek> when I tried it, I had to turn quite slow to get it to count, maybe .5 rev/sec of the wheel
[21:37:09] <jepler> is my math wrong?
[21:37:25] <cradek> too tired to check math
[21:37:34] <jepler> of course, that neglects the rise time of the wheel itself
[21:38:12] <cradek> it sure might be the old light bulb style
[21:59:53] <micges> hi seb
[22:00:07] <seb_kuzminsky> hi micges
[22:01:08] <micges> is there any way to get more than 4 pwm's on one 5i20 ?
[22:01:51] <micges> I mean more than 4x(pwm+enc)
[22:03:27] <seb_kuzminsky> you can get 8
[22:03:38] <seb_kuzminsky> or 12
[22:04:04] <seb_kuzminsky> the SV12 firmware has 12 servos (each servo is 1pwm+1enc)
[22:05:25] <micges> ah
[22:05:36] <micges> thanks