rigid tapping g33.1 isnt working spindle isnt sync

BigJohnT wrote: Are you saying what I'm thinking your saying? In the case where the encoder is not attached to the spindle or geared 1:1 with the spindle don't use the encoder index but rather provide an index directly from the spindle?

That's what I am saying.
The encoder-counter software doesn't know what you have done

to make things a little clearer the encoder is mounted directly on the back of the motor. the gear change decides which scale to use by invoking which ultimate gear ratio is being used. so that hasn't been a problem on my gui screen it is outputting the correct rpm for each gear. which is why I couldn't figure out why im having this problem to begin with.

again thank you to everyone for the help.

fabworx wrote: to make things a little clearer the encoder is mounted directly on the back of the motor. the gear change decides which scale to use by invoking which ultimate gear ratio is being used

You can choose a different encoder position scale and velocity scale for each gear, they are live pins. There will be discontinuities, and changing scale on the fly _really_ means that the index has to be on the physical spindle.
Don't expect to rigid tap with a gearchange in the middle. That is possible (in theory) with a spindle encoder, but not if you change the ratio.

so what I have here with my gear change function in the hal wont work with rigid tapping?

fabworx wrote: so what I have here with my gear change function in the hal wont work with rigid tapping?

It probably will, actually. You definitely need a spindle-relative index for multi-pass threading. You will not be able to peck-tap unless you have an index on the spindle.
But for a single-pass rigid tap (and if you don't care about the screw slots lining up[1]) then index on the motor is probably OK.

If it wasn't clear, when I said "gearchange in the middle" I was suggesting that it was a bad idea to expect to change the spindle gear half-way through the tapping cycle.

[1] My grandfather was a steam-engine fitter back in the 20s. They used to deepen counterbores and face off screws so that all the slotted screw-heads in the base plate were in a perfect line. I suppose it made it obvious if any had worked loose.

well I still have a problem cause its not working. I just changed the code as you suggested and my rpm is actually much more accurate then before so thanx for that. I dunno would entering in to mdi

s50 m3
g33.1 z-0.65 k0.08

work for testing purposes?

and I agree there would be no benefit, that I know of any way, to changing gears in the middle of an operation. not to mention there are no synchros in the gear box so damage would be likely.