Spindle indexing signal direction

When using G76, the lathe works correctly with M3, but sits and waits with M4
Would the issue be related to:

net spindle-index-enable encoder.0.index-enable <=> spindle.0.index-enable

Any help appreciated.
Thanks,


 

In my .hal file, Should I be using : spindle.N.revs

Is there anyone out there ???

Yes there is, but since i never used G76, i can not help.

I dont think this is index related.

is spindle-at-speed true?

Thats fine. Thank you for the relpy, I was begining to think I was on my own out here

"is spindle-at-speed true? "

Good question.

When I use G96 (CSS) and G1 with either M3 or M4, then the machine feeds fine.
So I could say , yes "spindle-at-speed true? " is fine.

However,
If I use G76 with M3, all works fine as well.
If I use G76 with M4, then the machine hangs in position waiting.
Therefor I could say that 'spindle-at-speed true' is functioning, however there may be a set of conditions were 'spindle-at-speed true' is'nt 'true' in the case of M4 & G76 that satisfy 'index' ??

It looks like G76 with M4 needs hal changes:

forum.linuxcnc.org/forum/38-general-linu...h-spindle-in-reverse

Eewww. That looks messy. Is there not an easier way?

(By the way PCW, thank you so much for the reply and finding this information)

Out of interest I've been playing around with HALshow.
If I turn the spindle by hand so the 'Z' phase notch in the encoder wheel passes through, then I get the below conditions:

SPINDLE-INDEX = becomes TRUE
ENCODER.0.PHASE-Z = becomes TRUE

However,
SPINDLE-INDEX-ENABLE = stays false at all times
ENCODER.0.INDEX-ENABLE=stays false at all times
SPINDLE.0.INDEX-ENABLE=stays false at all times

Is this normal ?