M19 and spindle-index-enable issues

Bringing back an older thread because there seems to be another issue that people run into with high(er) speed spindles and spindle index / M19. 

Everything seems to work until the spindle is at higher speeds and right after that you call an M19 to orient the spindle. 

Example:

S1000 M3 
M5 
M19 R0  -> Spindle is a 0 degree

S16000 M3
M5
M19 R0 -> Spindle is at 30 degree or another number due to EMI or another reason the spindle encoder count doesn't match a 100% anymore.

I was thinking of writing a component that would wait for spindle off and a low rpm range (1000 - 2000 etc) and then set the spindle-index high again. The spindle would then re-index before it stops and the next time an M19 is called the position should be accurate again?

Thoughts or other ideas?

 

Thanks Andy. I will take a look at the new orient.comp with "homing". Not sure if will address the issue, or will the new orient re-enable the spindle encoder index with every M19 command?

My particular issue is after I run my spindle in the higher rpm range (max 36000rpm). I can replicate the issue above 16K rpm. I still get a speed signal from the spindle encoder but the mesa encoder is not counting a 100%, it's missing a few counts every second or so and that adds up when you run the spindle for 5 min order longer. Right after I stop the spindle and try to do an M19R0, the angle is off by a bit. When I call my spindle homing routing, it will re-sync everything at low spindle speed and the M19 R0 is at the right position.

I wrote a simple test comp that waits for the spindle.0.brake (M5) signal && the encoder rpm between 2000 - 1000 - to then re-enable the encoder index. The spindle still does a couple of turns before it comes to a full stop and LinuxCNC has a "clean" encoder reader for a correct M19 call right after the M5. 

This seems to be working fine for me and my particular use case: high speed spindle with encoder. 

component spindle_index_enable "Enable spindle index after M5 (brake-on)";
pin in float rpm_in;
pin in bit brake_on;
pin io bit out;
function _;
license "GPL";
author "0x2102";
;;
FUNCTION(_) 
{
        if (rpm_in >= 1000 && rpm_in <2000 && brake_on) {
            out = 1;}
        else 
            out = 0;
}