On 6/6/25 14:51, Dave Engvall wrote:
I apologize in advance for being off topic but need ideas (cheap and easy) for
shutdown of a machine (Jet 25” planner) when overloaded, eg the drive belts
are making high pitched sounds. My thought are: tach/generator on drive shaft
and slave shaft. Integrate the voltage on each and trip when the integral hits
a certain difference.
I'm assuming you meant a woodworking planer? Single n. A 25" is a
pretty large machine & may use V-belts & std multi-hp induction motors.
Most planers used by us hobbyists are half that width and use cogged
timing belts. Which would be destroyed by /any/ slippage. The duplicate
encoder setup sounds good, until a prolonged run overruns one of the
encoders. The only thing I can suggest would involved a single hall
device to give a once per rotation trigger, driving a one shot, measure
that period and feed it to another one shot set to trigger if the first
one slows by 5%, to drive an another much longer period one shot showing
on an LED from the second one when it fires. It will also flash at power
up until its up to speed, giving the user a visual clue to start the
feed. If it comes on in the middle of a board, tell the user to reduce
the depth of cut for the next pass. Or cut the power at the same time.
Except for the led, that is all in the arduino file. Minimal cost. A $10
arduino could do that. Or a multicore arm64 could do it easier but
that's higher cost.
I’m open to other approaches. : suggestions ?
Machine is not mine but part of a makerspace with both good and clueless users.
Thanks !
Dave
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Cheers, Gene Heskett, CET.
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