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Author Topic: Screwcutting issue under Mach4  (Read 1444 times)

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Re: Screwcutting issue under Mach4
« Reply #30 on: April 12, 2020, 03:51:25 AM »
Hi,

Quote
Motor running at set speed to start of screwcutting, then Speeds up a bit, with a definite fluctuation, before settling down to a stable speed. Conclusion - Someone (Warp9 or Artsoft) is still Stuffing around with the set speed.

No, thats spindle PID.....you have to tune it, it sounds like its fairly close but PID tuning is the name of the game.

Craig
My wife left with my best friend...
     and I miss him!
Re: Screwcutting issue under Mach4
« Reply #31 on: April 13, 2020, 01:20:31 AM »
No. Spindle PID not the issue. Available, but not required in PWM (Used trimpot on module to give good speed control for all functions).
PID not available in OB Spindle (Not in this setup anyway).
There is an issue in the OB spindle Configuration, that only occurs when screwcutting, Perfect for all other functions.
No amount of PID adjustment will fix this.
Re: Screwcutting issue under Mach4
« Reply #32 on: April 13, 2020, 03:10:13 AM »
Hi,
spindle PID is a function of the ESS not Mach.

Craig
My wife left with my best friend...
     and I miss him!
Re: Screwcutting issue under Mach4
« Reply #33 on: April 13, 2020, 03:38:06 AM »
Yes, I noticed, but still no value here.
Re: Screwcutting issue under Mach4
« Reply #34 on: April 13, 2020, 05:04:01 AM »
Hi,
no value? It was created and implemented by Warp9 especially to deal with the need to maintain tightly controlled spindle
speed while threading....no value??

Craig
My wife left with my best friend...
     and I miss him!
Re: Screwcutting issue under Mach4
« Reply #35 on: May 15, 2020, 11:02:00 PM »
Threading has been working well for a while now (Plenty of variety of threads produced), so the PWM board change was the total solution.

Having said that, Constant volume cutting is a little bit strange. First cut fine, but others way deeper than expected.
Expecting 10 cuts, I get 5 (First cut OK at 1/10 of total volume). I do not think I have missed anything. Mach3 Does this type of cut correctly.
Mach4 - Constant depth cutting is Working fine.
Constant volume is my preferred option, so currently using G32.