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« on: April 08, 2006, 03:51:17 PM »
Hi, Thanks for the quick answer. So a plc i what you use. Is it on an ORAC?
I found this in the Turbocnc forum,
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"The toolpost has a DC motor driving a worm and wheel, and a rachet
with a click for each tool station. On the shaft holding the
toolholder there is an optical disk with three tracks, and each tool
station has a unique coding on those three tracks.
What Denford did was to drive the motor in the forwards direction
until the correct code was read from the three tracks, then reverse
the motor against the rachet and leave it in a stalled condition.
This way tends to overheat the motor.
My circuit basically does the same, but when 'on station' only
reverses for three seconds then powers off the motor. I find that
cutting forces happily keep the rachet and pawl engaged.
I read the status of the three tracks into the parallel port of a PC,
and drive forwards until I get what I want, then using a 555 timer
run in reverse for three seconds. The motor is driven using an
L298 'H Bridge' circuit."
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But i want Mach3.
He use the printer port on the computer and runs it macro.
/Jim