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Screw Jack

Help with keeping my screw jack from breaking the lifting screw?

I'll try to paint a clear picture.

I've got a 5-ton Nook screw jack lifting a large pin out of a hole. Between the jack and motor is a 12:1 right-angle reducer. A collar around the pin is intended to trip an adjacent limit switch, and the 1-hp motor driving the jack should stop when it sees a predetermined torque increase. The problem I'm having is that the motor isn't stopping until the pin makes contact with the jack housing and the lifting screw breaks. It's been suggested that I put some 40A durometer polyurethane between the pin and housing in order to slow things down and allow the motor controller time to work.

The problem I'm having is that I'm not really sure how to use all of the data I've got available to figure out if this will work, or even in which direction I should be looking. I can provide whatever additional details one needs, but even just a general idea of what I should be trying to solve/find would be great.

I imagine that you use the limit switch to stop the motor, and the torque cutout is to back it up, or it could be viceversa. The problem seems to be that the motor coasts on too far once it is given the stop signal, as it runs to a halt. Some motors have solenoid brakes for this purpose. There is also dynamic breaking in motor speed controllers. Obviously these still take some time to run down.

One idea is to have position feedback on the motor, so that is slows down as it approaches the position. The speed controller may have this capability, so only needs a posittion sensor to be added. Variations are to do the same sort of thing with additional limit switches, by slowing the motor down as it approaches. It could be that gearing the motor down will help, as the motor runs on for "N" revs, and the gears reduce this.

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