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Author Topic: mach3 turn spindle dro not working, spindle speed changing while jogging  (Read 28779 times)

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Hood,
OPB917B arrived, bracket fabricated, installed and everything up and running perfectly! Thank you very much for your help and advice!
Regards,
Wayne

Offline Hood

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No probs :) It was advice I got from John Prentice about 7 years ago that put me onto the OPB 917B so glad I could pass it on :)
Hood
Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #42 on: September 19, 2020, 07:27:34 AM »
Hi

I have read this topic few times but I cant solve problem with spindle speed DRO on my lathe.
Index LED works on the diagnostic screen. Spindle relays are enabled, spindle feedback in Sync. modes enabled,
tried different settings of Index debounce (0- 300), M3 command to run spindle....NOTHING :-[

Spindle true speed starts at S-command value and goes slowly to 0 and stay there...

I would really need index - true spindle speed for threading...

Could someone help with some new suggestion?

Thanks

Andrej

Offline Graham Waterworth

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Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #43 on: September 19, 2020, 06:47:20 PM »
What do you have for the index pulse?
Without engineers the world stops
Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #44 on: September 23, 2020, 02:35:39 PM »
Inductive PNP switch

Connection between PC and hardware is through NVUM V2
I have found few posts about this board and unfortunately the information are not good - it seems this board is a sh*t.

In the next days I will try with standard LPT breakout board.

Offline Graham Waterworth

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Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #45 on: September 23, 2020, 07:11:00 PM »
The NVUM is not a good option.  You will have much better results with a standard LPT board.
Without engineers the world stops
Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #46 on: September 26, 2020, 02:35:25 PM »
Unfortunately LPT is not an option... my laptop doesnt have this port  :(

Is there any option to get index working on NVUM-V2?

Did anybody succeed to get threading with NVUM-V2?

Thanks
Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #47 on: November 22, 2020, 03:23:01 PM »

Finally succeeded to replace NOVOSUN with traditional LPT breakout board and find older computer with LPT.
Now index works OK and rpm in MACH3 are stable.
So, I have used threading wizard and try to cut threads.
Threading starts, but only few mm moving is smooth and then starts to vibrate. Also return is not smooth.
Next pass starts also smooth, but starts to vibrate after few mm.
It's strange that speed- feed rate in MACH3 shows 0,75mm but programmed pitch is 1,5 mm
Also this feed rate varies from 0,72 - 0,78 - it's not stable - rpm in MACH 3 is stable and doesn’t change during threading.
Also cut thread has ~0,75 pitch.
Pulley ratio is set to 1.

What could be the problem? Any idea?

Thanks


Offline RICH

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Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #48 on: December 01, 2020, 11:09:17 AM »
Miha, A few things to check:

1. While in the threading wizard, and after all info was input, tick the box in the left top corner and the wizard
    will check you system for acceleration / feedrate at rpm noted. should not get a warning.
2. Your system axes  should be able to move at whatever feedrate smoothly and if it doesn't may need to tune you
    drive.
3. Are you manually controlling you rpm ? this refers to Pulley ratio?  Confirm you spindle rpm is running correctly
     for what you input in the wizard.
4. There is a manual on threading that I wrote long time ago and you can find it in Members Docs also check where
    Mach3 is installed since it is distributed along with the software.

RICH
Re: mach3 turn spindle dro not working, spindle speed changing while jogging
« Reply #49 on: December 02, 2020, 12:48:13 PM »
Thanks for a help, Rich.

1.  There is no warning - only information about threading - I'm attaching print screen...
2.  Both axis are moving smoothly at any feedrate -when jogging, turning,... Also first few mm while treading but then starts to vibrate and
    feed/turn starts to varry (even constant spindre rpm)
3. Rpm is controlled manually - by gearbox. Before threading I start and check rpm in Mach3. Then input this rpm in wizard...
   During threading rpm is stable - motor, and gearbox are quite oversized and therefore very stable.

I will try to find threading manual and try to find reason for not stable feedrate and wrong pitch.