Electrical Projects Like the old-time hand-crank grinder, the food to be ground is fed into a hopper in the grinder head. It is ground by a large worm gear, emerging through the sieve at the lower left of the head. Power is supplied to the grinder by an electric motor in the power unit.

Although the unit is electrically simple all components used must be heavy-duty because of the torque required to grind such foods as meat and gristle.

If there is continuity from one of the male plugs to the other with the power switch closed, but the motor will not turn, check to see if there are bent or binding parts in the food-grinder head. Do this by removing the head and then attempting to run the power unit. With the head disconnected, the power unit should turn 90-140 rpm (revolutions per minute). If the motor still binds with the grinder head removed, the problem is in the power unit. Check within the power unit for bent or jammed components—try rotating the armature slowly by hand to see that it turns easily, without binding or strain.

If continuity checks are good, and the armature turns freely, then the problem is probably in the motor. Check for burned, shorted, or open windings in the armature and the field coils.




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August 28, 2008