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This particular style of mill-drill was essentially a lightly altered copy of a Clausing industrial
 drill press. The dial on the front of the machine pushes on the rod seen here on the left, which
forces those two pulley halves together or lets them move apart. That alters the pulley ratio, and
thus the spindle speed. The rear pulley is spring loaded to compensate as the belt moves.

What went wrong? Well, the motor's start capacitor was going out, which caused the occasional
blown breaker. The bearings on the motor-to-VS jackshaft are worn and noisy, and the pulley is
loose enough to rattle. The wide belt is worn, and the bearings at both the VS assembly and the
spindle drive were both worn and noisy. The pushrod assembly was stiff from old dried grease
and the spindle bearings themselves were going bad. But hey, other than that... :)





All text, photos and graphics Copyright 1998- 2015, Doc's Machine & Airsmith Services. All Rights Reserved.
Information contained in these pages is for reference and entertainment purposes only.  Our methods are not always the best,
quickest, safest, or even the correct ones. It's up to you to know how to use your own machines and tools.
Keep your fingers away from the spinny blades o' death and you should be all right.