#linuxcnc-devel | Logs for 2018-09-25
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[15:08:07] <andypugh> Would nyone care to speculate on what these NML commands do? https://github.com
[15:09:32] <andypugh> https://github.com
[15:09:35] <andypugh> Nothing.
[15:09:45] <andypugh> But what are they _meant_ to do, I wonder?
[15:14:44] <rmu> andypugh: google found this https://ws680.nist.gov
[15:15:34] <rmu> The LOCK_SPINDLE_Z
[15:15:35] <rmu> command locks the spindle against vertical motion.
[15:15:44] <andypugh> The UNLOCK_SPINDLE_Z command unlocks the spindle to permit vertical motion. The SET_SPINDLE_FORCE (force) sets the force with which the spindle is pushed in the z-direction, potentially useful in tapping operations
[15:15:59] <rmu> The UNLOCK_SPINDLE_Z command
[15:15:59] <rmu> unlocks the spindle to permit vertical motion. The SET_SPINDLE_FORCE (force) sets the
[15:16:02] <rmu> force with which the spindle is pushed in the z-direction, potentially useful in tapping
[15:16:05] <rmu> operations.
[15:16:10] <rmu> ;)
[15:16:25] <andypugh> I have no idea how one would implement them. And clearly no-one has ever wanted them
[15:17:19] <rmu> seems to be leftovers from some NIST research
[15:19:58] <cradek> I bet these are all easy to understand if you think of them in terms of matt shaver's manual bridgeport that they were retrofitting in the very early days
[15:20:19] <cradek> those had a quill that locked and had a handle like a drill press that's very useful for drilling and tapping
[15:20:51] <sync> only for drilling really
[15:20:52] <cradek> nobody drills by calculating a feed on those, you just lean on the handle an amount that feels right and the drill drills whatever feed it likes
[15:21:13] <cradek> for tapping you'd start it by leaning on it, then let go, and reverse the spindle when it gets down far enough
[15:23:15] <Tom_L> the good ole days
[15:31:57] <andypugh> Spindle lock would be easy to implement, add a HAL pin
[15:32:32] <andypugh> But the force control? I guess another HAL pin and leave implementation to the user
[15:34:04] <sync> torque * pitch, but yeah
[15:34:12] <cradek> I think the part where you'd need to stop doing position control and then later start doing it again is the hard part
[15:34:33] <andypugh> Cam I stop fixing “runtests” when my branch fails the same number as master?
[15:34:54] <cradek> I can imagine air being a good way to set a certain force for drilling
[15:38:35] <sync> cradek: only switching between them is actually hard if you don't want discontinuities
[15:39:36] <cradek> yeah I agree, I meant to say that's what makes it hard
[15:59:00] <KimK> Sometimes "single-point broaching"(?) operations are done by pulling/pushing a tool vertically while keeping the spindle from rotating, and moving tiny increments in X & Y to nibble away the desired material. Could that be what they were doing?
[15:59:38] <KimK> I said vertically, assuming vertical mill.
[16:03:12] <KimK> If it was a Bridgeport (or clone) they were working with, I suppose they could lock the quill and broach with the knee?
[16:06:37] <andypugh> You can buy slotters for BP
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[18:49:33] <KimK> Indeed, here are three on eBay: https://www.ebay.com https://www.ebay.com http://www.ebay.com
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[19:10:03] <andypugh> I missed the correct slotting head for my mill a while ago. Unusually when the auction went for 282 and I had bid 250 I found myself wishing I had bid 350. Especially as I have three keyways to cut.
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[19:20:08] <seb_kuzminsky> andypugh: i think the problems in master might just be a flaky arm buildslave
[19:20:13] <seb_kuzminsky> all the other platforms are passing
[19:20:28] <andypugh> Hmm, yes
[19:20:50] <andypugh> In my branch I have all but M98 no 12 passing
[19:20:56] <andypugh> That is giving Bug code not m0 m1 m2 m30 m60 m99
[19:22:00] <andypugh> But master is OK
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[19:26:18] <andypugh> It seems that I am ending up in interp::convert_stop by mistake…
[19:27:46] <andypugh> Ah heck, I think already fixed this once…
[19:27:59] <andypugh> M99 is a valid stop code
[19:29:34] <seb_kuzminsky> isnt m99 like an o-word now?
[19:29:53] <andypugh> It’s a merge conflict I messed up, and seem to have reverted
[19:30:02] <andypugh> (I fixed it once already)
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