Fake encoder index for simulation

drummond wrote:

./turner.hal:207: Pin 'motion.spindle.0.revs' does not exist

Sorry, that was an error on my part, I typoed the older pin name by accident (now fixed in the original post) 

When I look at HAL configuration there are four pins associated with Stepperspindle: index-enable, rawcounts, spindle-revs, time.

I'm running the lathe motor with the following in the ini file:

MOTOR_SCALE 3200 // stepper takes 3200 steps per revolution
STEP_SCALE  1600 // lathe spindle has a 2:1 relationship with the motor, stepper revolves once, lathe spindle revolves twice.

I wondered how this might gel with:

setp stepperspindle.0.steps-per-rev 1600

Which went in HAL file per the original instructions, it seems correct- but how could I be so lucky?

Got the motor running and watched the first 3 pins.

Results:

index-enable=nothing
rawcounts=count is going but with a minus sign in front of it
spindle-revs=count is going but with a minus sign in front of it

I can "correct" the minus on spindle revs by changing the HAL entry to:

setp stepperspindle.0.steps-per-rev -1600, which feels wrong somehow because the originals in the ini file are both positive and produce counterclockwise rotation with M4

rawcounts seems less trivial to fix

from the comp file:

.......signed steps-per-rev = 100 "stepper steps per rev / per index";

If that means what I think it means it will produce indexes far more frequently than I was expecting?

Negative scales are not unusual to reverse specific functions.
Counts being negative is not a problem for the fake index comp.
But I suspect that you might have a misconfiguration if M4 is normal rotation unless this is a back-tool lathe.

Looking down the spindle towards the tailstock, M3 should be clockwise and count up.

Well, that was a typo combined with an interruption leading to an incomplete message being sent (!) Sorry about that

What it should have read is: "the originals in the ini file  are NOW both positive and produce counterclockwise motion with M3, to correct this I have to set them both back to negative

I could never get to watch the index changing by watching it on HAL configuration even with a spindle speed of 1 rpm (stepper running at 0.5 rpm)

I tried a simple g33 routine "in air" and everything seems to work, spindle synchronized motion without an encoder.  Thank you.