Yes, it is possible. You need a spindle with encoder and index pulse
output. The sample configuration "nist-lathe" shows the necessary HAL
configuration when the encoder is connected to parport pins 11, 12, and
13.
The sample ngc file "threading.ngc" uses a bunch of G33 (spindle
synchronized motion) commands to cut a thread; the file "g76.ngc" uses
the threading canned cycle to make a 20TPI thread.
The User Manual has a descrition and diagram of the numbers that are
used by the G76 threading cycle -- page 143 in the version here:
http://linuxcnc.org/docs/2.1/EMC2_User_Manual.pdf
Jeff
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