A brass dividing attachment I made for a rotary table.

The pump drills I referred to are 18th. C. type,used for hundreds of years. They have a tall shaft with a flywheel on it. A cross handle with a stout string is attached to the vertical shaft. Winding the string around the shaft and putting the drill point where you want it,and pulling down the cross handle starts the flywheel rotating. The bits are flat bits with their cutting edges ground on similar to modern drill bits,but no spiral. These drills are not meant for deep holes as the will stall out the pump drill. Still used by many watch makers and silversmiths.

Look way down the list of my projecvts and you will see pump drills I made. 6 of them.
 
Just beautiful workmanship.
 
Back
Top