Enhanced Machine Controller

If the feedrate is set to zero (or not set at all), spindle syncronized
moves are skipped.

start sim-lathe

F1; F2; MDI M3S500; G0Z1; G33K0.03Z0;

the G33 move does nothing

motion doesn't assert hal pin motion.spindle-index-enable

EMC thinks that the G33 move completed instantly - if you issue a G1 or G0
next, it is executed

Problem happens in TRUNK, not in version 2.2.x

For more details see:
http://www.linuxcnc.org/irc/irc.freenode.net:6667/emcdevel/2008-03-08.txt
(starting at 22:45:49)

More discussion:
http://www.linuxcnc.org/irc/irc.freenode.net:6667/emcdevel/2008-03-09.txt

And some logging info:
http://pastebin.ca/934655