emc's motion controller uses the following HAL pins during the G33
spindle synchronized move and G76 threading canned cycle:
motion.spindle-revs
motion.spindle-index-enable
These must behave like the "canonical encoder interface" pins 'position'
and 'index-enable', described here:
http://linuxcnc.org/docs/devel/html/hal_general_ref.html#sec:CanonEncoder
It is possible to imagine a component which reads an "index" input in
the fast thread and produces a "guessed" spindle-revs value every servo
period based on the expectation that the spindle velocity is constant
during the threading moves. However, no such component has been
contributed to emc. If you develop this component, please consider
contributing it:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?ContributedComponents
Jeff
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