I have a Bridgeport Interact 2 CNC mill and it has a back gear.
In back gear, the spindle turns at the -1/8 of the original speed, that is,
8 times slower and in the opposite direction.
I have an encoder on the driven pulley of the variable drive. Therefore,
when my mill is in straight gear, the angular position of the encoder is
exactly the same as the position of the tool in the spindle.
However, in back gear the position of the tool in spindle, is MINUS 1/8 of
the position of the encoder.
I would like to put a microswitch near the back gear lever, so that EMC2
would sense whether the mill is in back gear.
The motor runs off of a VFD, controlled by EMC2 (PPMC by Jon).
If this back gear sensor microswitch is ON, I would like EMC to change its
behavior thus:
1) Spindle forward actually tells the VFD to rotate the motor backwards, so
that the actual spindle would spin clockwise, as intended.
Spindle reverse actually tells the VFD to rotate the motor forward, so
that the actual spindle would spin counterclockwise, as intended.
2) Spindle position (spindle-pos) would be -1/8 of the output of the
encoder ppmc.0.encoder.03.position.
My question is, what EMC elements I can use to accomplish these two changes.
Cases 1 and 2 seem to be somewhat different, but I think that someone did
this already.
The hope that I have is that with this microswitch back gear sensor, the
machine would behave very nicely, going forward correctly when forward is
commanded, and able to rigid tap due to proper conversion of driven pulley
position into the spindle tool position.
Any ideas (how to accomplish items 1 and 2 in EMC) will be most gratefully
received.
One seems to be some sort of an "if" conditional to choose what output to
manipulate. Another seems to be an if conditional to choose a spindle-pos
multiplier, choosing between 1.0 and -0.125 depending on microswitch input.
Thanks
i
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