Update on indexing problem.

In the thread "Problems Threading on the Lathe", Art has explained that SPINDLE has to be on in version R.3.042.032 for indexing to work.

This explains why I was always getting zero RPM when spindle was under manual control.

The negative RPM problem remains. Following test carried out:

Start Mach
Disconnect spindle motor electrically
Select SPINDLE button on screen (or run M3)
Rotate spindle slowly by hand
As the index slot passes the opto switch the INDEX LED flashes and the True RPM changes from 0 to approx minus 50 RPM
Stop rotating spindle
True speed DRO remains at minus 50 RPM
Toggle SPINDLE button on and off, with spindle stationary, RPM alternates between 0 and minus 50
This condition remains until MACH is restarted.

The same test carried out on version R3.042.020
As the index slot passes the opto switch the INDEX LED flashes and the true RPM changes from 0 to approx plus 70 RPM
Stop rotating spindle
True speed DRO returns to zero RPM

Under normal running conditions R3.042.020 is effectively displaying the correct RPM over the entire speed range.

Version R3.042.032 displays zero RPM until the first pulse has been detected from the indexer, then dispalys a negative value whenever the SPINDLE button is on. This negative value does change as spindle rotation speed changes but is not proportionate to the true speed.

Any ideas anyone ??

Thanks

Peter

Peter,
The only problem i am having is at a low rpm of 55 and all the others to 2300 are fine. The DRO shows 55 rpm but in the Threading Diagnostics the true rpm value is all over the palce but the application rpm is ok. Art is aware of this and also the rpm not going back to a zero value.

If you manualy turn on the motor then you need to uncheck the relay control box in config>ports&pins>spindle for now.

RICH

I'm seeing the same problem here. With .032 installed I'm getting a negative 500 rpm in the spindle speed dro while the set rpm and actual rpm are 1000 rpm. Going back to .029 the problem goes away. I've tried complete and clean installs as well as switching back and forth, but the problem follows .032. The index pulse is working OK but threading hangs after the spindle starts. - Terry

Probably best to transfer this dicussion to the "Problems Threading on the Lathe" thread
Peter