On Jul 7, 7:04*pm, Stuart Wheaton wrote:
Don Foreman wrote:
On Mon, 6 Jul 2009 03:05:21 -0400, "Buerste" wrote:
How can I cheaply,
easily sense this condition and turn off the motor?

How about this, Assuming a spring loaded ball type limiter, ...

Two (or more) radially opposed balls between plates, the driven plate
free to slide axially against a spring and adjusting nut. Cut a
shallower circular groove or lip, slightly outside the ball recesses,
that will retain them but let the plates turn independently, at a
greater axial separation. Arrange your limit switch to detect the
shifted, stalled plate.

The trick is resetting it. Perhaps have a short spiral track the ball
follows out when tripped and back into place when either shaft is
reversed. The noise of the ball dropping into the slightly deeper
outer end of the spiral groove is the audible trip indicator.

jsw