Hello
This is probably not that helpful, but I am dealing with the same
problem by replacing the motor and pulleys with 3 phase motor connected
to a variable speed drive. One pulley pair will replace the four I
current have and give a much wider speed range, especially slow speeds.
With modern electronics and on-line auctions, this option is a
reasonable cost.
My plan is to interface EMC to the VSD.
Regards
Darren Conway
Jon Elson wrote:
Hello, all,
I've been thinking about how to best deal with CNC control of spindle
speed on a machine with manually-changed belts and gears.
I think I can rig optical sensors for the belt that would report what
belt ratio is set. Detecting the position of the backgear handle is
easy. So, the question is what to do when the belt/gear ratio is
inappropriate for the requested Sxxxx speed? The most optimum would be
a message pops up saying "Backgear is engaged, can't reach 2720 RPM,
press R to resume when problem is corrected." That is most likely not
easy to do with the current EMC2 setup. Probably the worst workaround
would be to set the VFD for the maximum safe speed and muddle through,
and hope the operator notices it doesn't "sound right". So, anybody
have any ideas on how best to handle having EMC deal with the case where
the belt/gear is put in the wrong selection for the requested speed?
Thanks,
Jon
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