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rigid tapping needs reversal of spindle so backlash matters.
If i have encoder on spindle shaft backlash
will be problem?
How many lines encoder needed for rigid tapping?

Oh thanks a lot, your code example was very helpful. I just started learning python and my level so far is “monkey see, monkey do” Without a concrete example it's hard for me to understand exactly how to do it. Now I can find my mistake, I tried it for one slider, the values are changed and saved.

tristate_bit and tristate_float are the names of the hal components,
but tristate-bit.n.xxxx and tristate-float.N.xxxx are the names of the function
and hal pins that the component exports.

tristate_bit works on bits where tristate_float works on floating point numbers.

I looked at the sim config an edited a mesa config to add the new TP, but it does
show major acceleration spikes (~500K)  lasting 1 servo period. I needed to set
large  following error limits  to avoid the spike triggering a following error.

Note that this is not hardware related but may have a relation to scaling so I can try again
by modifying the sim config to make sure everything else remains the same.
 

Now taking an interest in the G10 L2/L20 pair of Gcodes.
Cannot make sense of the Documentation against the machine display.
My current job is positioned with its G54 origin having x, y, z values -ve relative to Home.

Parameters #5221, #5222, #5223 are documented as the coordinate system Offsets for G54.
The parameters in the linuxcnc.var file correctly show the G54 origin with -ve values.

But, to set up the machine correctly, I have to swap the signs used with a G10 L2.

When Gmoccapy launches, before homing, the DRO shows the tool position with +ve values.
Then G10 L2 P1 with +ve values loads the DRO with -ve values (CORRECT for this job).

Then conventional Touch-Off and run the job.

Please, is my brained screwed, or is the Documentation misleading ?

John.