After I made the Winding Stem I went on to make a Winding Pinion prototipe in brass, I took all the mesurements from the old worn out winding pinion, planned a strategy of action and then I set up all the gear, lathe (shaublin 70) microscope, milling attachment and cutter.
Chucked a big piece of brass ron in the 70, turned it down to right diameter, drilled the centre hole set the milling attachment on the cross slide and set the microscope, centered with the piece first and centered the cutter with the microscope, engaged the dividing head, found the right depth for cutting the teeth and off I went with the cutting of the teeth.
First the cycloid and then the breguet teeth.
I had to cut 2 different tipe of teeth, Cycloid on the external circumference and ratchet or breguet teeth in front of the pinion but I had to be creative as I didn't have the right cutter to cut away these kind of teeth.
Once all the teeth have been cut I parted off the pinion from the brass rod reduced it to dimension and removed all the burrs and then tried in the movement.
As it seemed to be fitting quite well in the movement and engaging well with the sliding pinion off I went to make the real piece in steel.
