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If it does not count reliably, it suggests a problem with
the quadrature.

The count should be absolutely consistent.

Tommylights suggestion to use an oscilloscope is good.

Also if you can run the spindle at (very) low constant speed you can look
at the encoder A/B signals with halscope.

The signals to watch are:

hm2_7i92.0.encoder.00.input-a
hm2_7i92.0.encoder.00.input-b
hm2_7i92.0.encoder.00.input-index

( assuming the spindle encoder is encoder 00 )

I wrote this parametric G-code program and it seems to run fine on my simulation machine.  But when I try to run it on the real machine it stops at line 20  and gives (Does not exicute line 20) no feedback as to why.  However my simulation machine is running Linuxcnc 2.9, and the real  machine is only on 2.7.