I was looking at the spindle control pins on the latest EMC2 build from the
Ubuntu live CD and had a few questions about operation. Some high speed
spindles can take several seconds to get up to speed, and some spindles may
be under manual control. I know manual control sounds stupid, but some
machines like the old Bridgeport Boss series use reeves sheeves and an air
motor for speed control. You have to turn the spindle on to set the speed
with the air motor. These are better left under manual control with EMC
being able to stop the spindle. However, EMC needs some idication that the
spindle is indeed on (after commanding it on), and at the proper speed.
The only reasonable solution I see at the moment is to use some external
ladder logic and take advantage of the feed-hold pin. However, this seems
like a bit of a kludge. I think some sort of "spindle-up-to-speed" handshake
input needs to be added to motion. Am I missing something?
Best Regards,
~petev
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