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[16:27:31] <cradek> ugh, got a bunch of emc-users unsubscribes all at once again
[16:27:33] <cradek> wonder what happened
[16:29:26] <cradek> bounce processing is still off (and sf hasn't done anything at all about the dmarc problem)
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[16:57:43] <kwallace> Hello, I'm planning on adding a D flag to G76 for a thread taper feature. Fanuc seems to use R = (start_dia - end_dia) / 2. I'm wondering if I should use the same or use a slope or angle instead?
[17:00:56] <archivist> a lot of taper threads are specified as a diameter ratio like 1 : 16
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[17:05:39] <archivist> this was something I was looking at a few years ago but life got in the way :(
[17:06:58] <cradek> the interaction of L and (your proposed) D makes my head hurt
[17:07:53] <cradek> I think having L was a mistake
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[17:11:02] <cradek> NPT is 3/4 inch per foot diameter change
[17:11:11] <cradek> I guess that's 1:16 as archivist says
[17:11:50] <archivist> BSP and NPT are the same taper as it happens
[17:11:55] <kwallace> I was thinking of applying D over the length of the drive line, so L would not matter?
[17:12:02] <cradek> so you'd use D0.0625 (if in G7) or D0.03125 (if in G8)?
[17:12:23] <cradek> so disallow L if using D? that sounds utterly reasonable to me
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[17:14:57] <kwallace> I think the path between the end tapers would follow a model path that had no tapers.
[17:15:33] <kwallace> What are the end tapers for?
[17:16:55] <archivist> tool in/out
[17:17:30] <archivist> no need for safety groove
[17:17:32] <cradek> well for one thing, you can cut a thread that's not at the end of something
[17:18:55] <cradek> imagine you want to make an adapter in one chucking - you can cut both threads (use an entry taper for the left one), then part off in the middle of the left one
[17:19:10] <cradek> I bet it's not used much
[17:19:29] <archivist> I use the exit taper all the time :)
[17:19:35] <kwallace> An entry in X only could still work, or I would tend to cut a channel before threading.
[17:19:38] <cradek> I bet it's used all the time
[17:20:20] <cradek> yes you could cut a channel, but then you have really limited space to get accelerated and sync up
[17:21:16] <kwallace> Ahh, yes.
[17:24:17] <cradek> if you're using D, you'll have to check for and forbid G41 Dx G76 ... but I think that's fine
[17:24:47] <cradek> I bet people don't use cutter comp with G76 anyway
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[17:27:08] <kwallace> Yeah, I found this in interp_check: " if (block->d_flag) {
[17:27:08] <kwallace> CHKS(((block->g_modes[7]... " and thought it might need attention.
[17:27:23] <cradek> yep bet so
[17:29:12] <kwallace> Oops, that just checks if D was in a block and was tied to something appropriate.
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[17:34:27] <kwallace> I suppose after getting D in and working, it's just as easy to make it work as an angle, slope or delta X.
[17:36:04] <cradek> that's true
[17:36:20] <cradek> delta X seems the most fiddly for the gcode programmer, to me
[17:36:36] <cradek> if you decide you need one more thread (more Z) you have to recalculate it and adjust it
[17:36:43] <cradek> same if you decide you need some more lead-in
[17:37:05] <cradek> for one particular taper, the delta X would be different for every thread you do
[17:37:10] <cradek> that seems pretty silly
[17:37:31] <cradek> to me, one of the schemes that lets you specify the taper directly would be better
[17:39:06] <cradek> on the other hand, I've only ever cut NPTs with dies, so what do I know
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[17:39:27] <cradek> time for coffee break
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[17:42:41] <kwallace> Well Mach seems to use a degree value, so that must be right. A Fanuc example looks like a pain:
http://www.helmancnc.com/tapered-threading-with-fanuc-g76-threading-cycle/
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[18:31:53] <archivist> fanuc R does look a bit silly
[18:33:28] <archivist> I usually use my manual lathe and set the angle or x:12 has taper turning attachment
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