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[01:25:59] <JT-Shop> SWPadnos: yep they are still there in 2.4, but there seems to be some kind of link problem in 2.4
[01:26:05] <JT-Shop> 2.5
[01:27:25] <JT-Shop> KimK: If I remember right if you move or delete or add a file do a make clean then a make
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[01:38:56] <KimK> JT-Shop: Thanks, I'll try that! And I might see if I can manage to annoy everybody on this step timing business too, I had a question about that. There are two(?) conflicting examples, maybe? So: If I set the base thread to 50,000ns (20kHz), should I expect a max of 20,000 steps/sec or 10,000 steps/sec? I was looking at the "step period high" and "step period low" on JT's forum diagram. It fits one example but not another.
[01:42:10] <JT-Shop> I think that depends on if your using the reset thingy which gives you 1 step per period vs 1 step per 2 periods or something like that
[01:44:25] <KimK> I'd like to make sure all our manual examples are correct. Or at least all wrong in the same way, lol! In the Integrator Manual, anyway, that's the last one I have to do, and I'm going through it now. The other manuals I've done already, and I'm willing to let them go, lol!
[01:45:55] <JT-Shop> what's the link to the forum diagram?
[01:46:38] <KimK> Plus it doesn't help that I'm a servo guy and have never used the built-in stepgen. Worked with steppers a little, but always with external hardware stepgens.
[01:47:15] <KimK> The forum link is the one you posted about 10-15 lines back.
[01:47:51] <JT-Shop> not my diagram
[01:48:09] <KimK> OK.
[01:48:35] <JT-Shop> I just posted the link as I had no clue as to what to answer :)
[01:49:24] <JT-Shop> I would think that the diagrams in the manuals are exactly correct for EMC :)
[01:50:38] <KimK> And I just re-posted the link because that's the first indication I've seen relative to the "full-speed" vs. "half-speed" business I was just mentioning relative to the examples in the manual.
[01:51:26] <KimK> I wondered if the base period was acting as a "clock" and therefore had to act twice to cycle the step.
[01:51:50] <KimK> Or does it only have to act once, I don't know.
[01:52:21] <JT-Shop> just depends on if you use the reset that resets the step after a time but before the period ends
[01:52:30] <KimK> Anyway, the inconsistent example bothered me when i went through them.
[01:52:40] <KimK> s/example/examples/
[01:53:07] <JT-Shop> before that it took two periods for each step, one for step and one for step space now it can be done in one period
[01:53:50] <JT-Shop> time for me to retire for the night
[01:54:41] <KimK> OK, great, thanks, that's the answer. "...now it can be done in one period". So I'll make the examples consistent with that. Goodnight, thanks for your help!
[01:55:41] <JT-Shop> it can still be done in two periods...
[01:56:00] <KimK> Is there a "default" selection?
[01:56:23] <JT-Shop> stepconf wizard gives you doublestep
[01:56:46] <KimK> Or if this is something that gets set in stepconf, maybe I'll have to show it both ways?
[01:57:16] <KimK> I don't want to confuse newcomers who are going through the examples like me.
[01:57:22] <JT-Shop> not sure if there is an advantage to not use doublestep
[01:58:09] <JT-Shop> yep, keep it as simple as you can for newbee's
[01:59:01] <KimK> Also, for all the talk of "steplen" and "dirhold" and such, I didn't see any step timing diagrams (like the forum diagram), at least not in the first 20% or so of the Integrator Manual (all I've done so far).
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[03:42:27] <SWPadnos> KimK, it may be best to not change the stepping examples
[03:42:57] <SWPadnos> "doublestep" works, but it is only useful for stepper drives that need relatively short step pulses
[03:43:27] <SWPadnos> like under 5 uS or thereabouts
[03:44:07] <SWPadnos> the reason being that it will busy-wait during the step, so that the pin(s) can be reset at the end of the thread run
[03:45:05] <KimK> OK, but first, we may not be talking about the same examples. I'm only talking about a couple of brief calculations in the text where the numbers come out double or half. I don't want to change any lengthy presentations with graphics, etc.
[03:45:16] <SWPadnos> ok
[03:47:10] <KimK> I was just confused why in one spot it was double and one not, or vice-versa. I've fixed it in one spot by just mentioning both numbers, I think I can do the same in the other spot. That's it. I'll leave the explanations of why double or not to another chapter.
[03:47:20] <KimK> Is that OK?
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[03:48:06] <SWPadnos> no idea. which part are you talking about? :)
[03:49:20] <KimK> I only have one for sure right now, hold on... Also minor storm front approaching in the event I get cut off.
[03:49:37] <SWPadnos> sleep approaching here, so no worries
[03:51:29] <KimK> From front of Integrator Manual: For example, if you are running a drive with a 20uS direction signal hold time requirement, and your latency test said you have a maximum latency of 11uS, then if you set the BASE_PERIOD to 20+11 = 31uS you get a not-so-nice 32,258 steps per second in one mode and 16,129 steps per second in another mode.
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[03:52:09] <KimK> My change is I just mention both modes at the end of the line, so it better fits with the other example, which I don't have in front of me at the moment.
[03:52:33] <SWPadnos> ok, that probably makes sense
[03:52:49] <KimK> So that's OK then?
[03:53:18] <SWPadnos> note that at 10000 steps/inch, even the slower step rate is still ~100 IPM
[03:53:20] <SWPadnos> yep
[03:54:02] <KimK> OK. Didn't mean to scare the horses, lol.
[03:54:09] <SWPadnos> heh - yep
[03:54:32] <KimK> thanks, goodnight
[03:54:38] <SWPadnos> people are all over the top speed, but for the most common stepper machines, what sounds slow is still fast enough
[03:54:45] <SWPadnos> sure. thanks for working on docs :)
[03:55:35] <KimK> Accel/decel was what killed John's speed, not max step rate
[03:56:05] <SWPadnos> the person with the F200 rapids but only 75 IPM G1 moves?
[03:56:13] <KimK> No problem.
[03:56:28] <KimK> No, that must be somebody else.
[03:56:33] <SWPadnos> ok
[03:56:53] <SWPadnos> oh, John, the guy with the BP, who we see at the CNC workshops
[03:57:54] <KimK> Yes, he's moving a lot of mass there on that BP2 (he calls it a Bridgeport on steroids), so you can't change speeds very rapidly.
[03:59:39] <KimK> And since it's a knee mill, X is carried by Y, and X and Y are carried by Z, so things get slower and slower as you move up the axis list. Same motors and drivers on all axes.
[04:00:11] <SWPadnos> yep, got the same kind of machine here, only a series 1 (so lighter, but still stacked the same way)
[04:00:40] <SWPadnos> well, I guess I'll hit the sack. I can't remember if I need anything else from Mcmaster tonigth
[04:00:42] <KimK> Did you ever get your Hardinge going, I forgot?
[04:00:44] <SWPadnos> good night
[04:00:47] <SWPadnos> nope
[04:00:54] <SWPadnos> got rust though :(
[04:01:09] <KimK> OK, thanks, goodnight. (Good summer project!)
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