#emc-devel | Logs for 2007-12-23

[00:00:10] <jmkasunich> getting rid of Y in COORDINATES got rid of it on the display, and the home icons appear next to the proper items now
[00:00:28] <jmkasunich> nother question
[00:00:59] <jmkasunich> resetting the interp when you switch from manual to auto (or MDI), is that per some spec, or because it gets around some horrible complexity, or just because?
[00:01:19] <jmkasunich> its quite annoying when you are running the spindle to touch off, and as soon as you touch off the machine stops
[00:01:32] <jmkasunich> usually the tool is still touching the work, and I don't like that
[00:01:47] <jmkasunich> (this is a rough touchoff, where you jog until you get a chip)
[00:02:36] <cradek> I've had that battle before, and others argue for the behavior
[00:03:02] <jmkasunich> heh
[00:03:03] <cradek> I agree I don't want the spindle to turn off
[00:03:25] <cradek> I want to MDI S1000 M3, and then set my jog speed low and use continuous jog to do a facing cut
[00:03:33] <jmkasunich> also related to spindle - M3S0 (or M3 with no S at all, so its still at its default value of 0) should still command spindle on
[00:03:49] <cradek> I think that's a spec issue
[00:04:00] <jmkasunich> it is, jepler said its in the spec
[00:04:04] <cradek> (and I don't care one way or the other)
[00:04:31] <jmkasunich> I talked to ray about it, he thinks most controls allow M3S0 and do what I expect
[00:04:47] <jmkasunich> I think (he agrees) this is a place where NGC has it wrong
[00:05:03] <cradek> ok
[00:05:24] <cradek> when you fix it, there's a place in the documentation that lists where we depart from ngc behavior (and why)
[00:05:43] <cradek> s/when/if/
[00:05:46] <jmkasunich> darn, how'd I step into that
[00:06:05] <cradek> whee, 42 -> 62 degrees in a half hour
[00:06:13] <jmkasunich> thunderstorms coming?
[00:06:52] <cradek> no, new heater
[00:07:28] <jmkasunich> oops - I thought you meant outside temps
[00:07:37] <jmkasunich> thats the 7.5kw?
[00:09:50] <jmkasunich> ok, thats weird
[00:10:01] <cradek> yes
[00:10:03] <jmkasunich> start up machine, hit home on x and y, both displays read zero
[00:10:11] <jmkasunich> f5 to get to MDI
[00:10:27] <jmkasunich> G0X-4 (trying to get the tool out of the way so I can drill)
[00:10:46] <jmkasunich> it moves about an inch and half and stops with the display reading -1.77 something
[00:10:59] <jmkasunich> X-3, it moves forward, and stops at -0.77 something
[00:11:25] <jmkasunich> my home offsets and such are all zero (home vel is zero, I have no switch)
[00:11:44] <jmkasunich> is MDI working in some other coord system than the one being displayed?
[00:11:54] <cradek> maybe display is set to absolute (in the menu)
[00:11:58] <cradek> it should be relative
[00:12:40] <jmkasunich> switching from "machine position" to "relative position" does nothing
[00:12:55] <jmkasunich> offsets should be zero, all I did was power up and hit home
[00:13:32] <cradek> hmm
[00:14:02] <cradek> g92.1?
[00:14:22] <jmkasunich> I didn't do that, are you suggesting that I MDI it and see what happens?
[00:15:01] <jmkasunich> no change
[00:15:14] <jmkasunich> g92.1 shows in the "active codes" box
[00:15:24] <jmkasunich> wait, it did have an effect
[00:15:27] <jmkasunich> duh
[00:15:52] <jmkasunich> numbers didn't change, and machine didn't move, but when I did X0, it went to zero, not something.77
[00:16:12] <cradek> is your var file writable?
[00:16:25] <jmkasunich> chili is almost done.... I better stir it before it sticks - back after dinner
[02:28:13] <cradek> * cradek refuses to calculate how much time it took to make those, per T-nut
[02:33:02] <fenn> consider it practice
[02:35:29] <cradek> well they're great T-nuts
[02:52:30] <jmkasunich> you need to make lots at once
[02:52:37] <jmkasunich> (even if you don't need them)
[02:54:33] <jmkasunich> * jmkasunich wonders how they drilled the thru-tool coolant hole in this drawbar
[02:54:43] <jmkasunich> 0.085 dia x 9" long
[02:54:58] <SWPadnos> l-l-l-laser
[02:56:49] <fenn> * fenn wonders why the hole is so small
[02:58:07] <cradek> I made 8, twice as many as I'll ever use
[02:58:21] <SWPadnos> no wonder why it took twice as long
[02:58:49] <SWPadnos> sigh. my left monitor just died
[02:58:59] <jmkasunich> fenn: the bar is only 6mm OD, and threaded M6 x 1 which means the thread root dia is about 0.190
[03:00:21] <jmkasunich> and it has 132 bellville washers trying to stretch it
[03:01:31] <SWPadnos> are those washers "parallel" or "series" ?
[03:01:50] <SWPadnos> must be parallel given the length, I guess
[03:01:50] <jmkasunich> yes
[03:02:07] <jmkasunich> 66 series sets of 2 in parallel
[03:02:32] <SWPadnos> heh - I just ran across the business for that Mongolian Grill we went to in Peoria
[03:02:38] <SWPadnos> "Flat Top Grill"
[03:02:44] <SWPadnos> business card
[03:02:59] <jmkasunich> that was pretty good
[03:03:04] <SWPadnos> yep
[03:15:04] <fenn> apparently they make small steel tubing in a continuous process by tig welding and then drawing over a mandrel
[03:16:15] <fenn> not quite sure what "plug drawn" means
[03:18:35] <fenn> "A technological process limitation exists as average wall sizes approach 2mm"
[03:26:45] <jmkasunich> the limit is for thicker then 2, or thinner?
[03:26:55] <fenn> it must be thinner than 2
[03:27:37] <fenn> though i dont know why, seems like you could just pierce a big fat cylinder and then draw it down like wire
[03:32:33] <jmkasunich> I love working with quality stuff
[03:32:46] <jmkasunich> the bearing retainer ring threads on
[03:32:55] <jmkasunich> there are three setscrews that seem to bear on the threads
[03:33:03] <fenn> yeah i've seen that
[03:33:15] <fenn> on a mt2 socket spindle i bought on ebay :)
[03:33:41] <jmkasunich> take it off, and you have to look at the inside of the threads _very_ closely to see the plugs that are in the setscrew holes and were threaded at the same time as the ring
[03:34:23] <fenn> oh, on mine, the ring has a flexture cut into it, which the setscrew presses on
[03:37:49] <fenn> neat, if you get the angles right, you can hold a plug at a certain location in the tube you're drawing, without any mandrel to hold it still
[03:38:42] <fenn> then you can draw down an entire coil of tubing
[03:39:18] <fenn> like choking a snake that swallowed an egg
[04:18:52] <cradek> jepler: how's emc now that you're a user?
[04:18:58] <cradek> jmkasunich: ^^
[04:21:14] <jmkasunich> not bad
[04:21:23] <jmkasunich> I'm finding a few quirks
[04:39:47] <fenn_> fenn_ is now known as fenn
[05:10:33] <cradek> jmkasunich: that always happens... I bet we all see different quirks, which is good.
[05:11:51] <cradek> wish I had a 7/16 dowel pin.
[05:12:33] <cradek> actually I wish I had one (or two) of each size of dowel pin. it seems like the big ones (above .375) can only be had in boxes of 100 at great cost
[05:13:18] <cradek> actually I wish I had a set of gage pins.
[05:13:21] <jmkasunich> how long?
[05:13:23] <cradek> and a pony.
[05:13:39] <cradek> the 7/16 I wish I had would be shortish
[05:13:42] <jmkasunich> mcmaster has 7/16 x 1" at 5.83 for a box of 10
[05:14:26] <jmkasunich> they have "pull out" ones (with a threaded hole in them) for $1.25 each - more per pin, but you can buy 1
[05:14:39] <cradek> aren't those tapered?
[05:14:54] <jmkasunich> nope
[05:15:10] <cradek> interesting, I might do that when I order from them next
[05:15:14] <jmkasunich> go to mcmaster, search for dowel pin, select steel, select diameter
[05:15:20] <cradek> thanks
[05:15:27] <jmkasunich> (their site isnt' IRC friendly, can't post URLs)
[05:15:39] <cradek> yeah I remember trying that...
[05:16:02] <jmkasunich> they are always my first choice for fasteners and other such parts
[05:16:10] <cradek> often I can use drill bits for stuff like this (measuring distance between holes for instance)
[05:16:33] <jmkasunich> other places might be a bit cheaper, but mcmaster has the selection and the delivery is great (I get it next day, cause there is a warehouse near me)
[05:18:14] <cradek> wow, next day would be nice. lots of stuff takes 3-4 days (ground) to get here
[05:18:33] <jmkasunich> thats cause you live in the middle of nowhere
[05:19:39] <cradek> I'm pretty sure I'm somewhere
[05:19:56] <cradek> any progress on getting a spindle encoder going?
[05:20:11] <jmkasunich> no
[05:20:18] <jmkasunich> thats a bit down the road
[05:20:25] <jmkasunich> jogwheel and quill motor first
[05:20:34] <cradek> ah, you want to mill
[05:20:39] <jmkasunich> yep
[05:20:43] <jmkasunich> oh, and home switches
[05:20:46] <jmkasunich> the quill has one
[05:20:54] <jmkasunich> I want to mount one for the table
[05:21:07] <cradek> I sure need home switches too. but what a pain to do
[05:21:16] <jmkasunich> not going to bother for the saddle - it would be hard to home to either end on the lathe
[05:21:41] <jmkasunich> I want screw error comp
[05:21:43] <cradek> yeah it does you very little good
[05:22:07] <cradek> lathe Z never has the same limits - they're not very useful
[05:22:30] <cradek> but lathe X really really wants a home switch
[05:22:34] <jmkasunich> right
[05:22:59] <jmkasunich> I made my 2nd CNCd part today
[05:23:04] <cradek> yay!
[05:23:09] <cradek> what is it?
[05:23:24] <jmkasunich> a stepped washer for taking apart these spindles
[05:23:38] <jmkasunich> fits over the nose, and a modified bolt goes thru it to engage the drawbar
[05:23:53] <jmkasunich> put it in the drill press, use the press to compress the spring, tighten the bolt
[05:24:09] <jmkasunich> and the spring load is held by the bolt while I push out the cross pin
[05:24:30] <cradek> cool
[05:24:34] <jmkasunich> then back in the press, take the load with the press, undo the bolt, and gradually release the load to get the drawbar out
[05:25:11] <jmkasunich> I should put the bathroom scale on the drill press table and see what the drawbar load is
[15:20:13] <Guest226> Guest226 is now known as skunkworks
[15:49:09] <skunkworks> logger_dev: bookmark
[15:49:09] <skunkworks> Just this once .. here's the log: http://www.linuxcnc.org/irc/irc.freenode.net:6667/emcdevel/2007-12-23.txt