
There ... I made a dozen trials for the drilling of teeth of gears. I must say that it is useless, it must be too specific it is better to follow the guidelines and draw the gear directly on the wood, rather than trying to solve a system for hours to have a very encouraging result . By cons on the grinding round keeping an axis perfectly centered, then it's worth it.
To start, I made a small round circle with an old washing machine motor which I placed on its axis a wooden tray. After having "set the stage, I would have loved boxing and a work table on which I made a great light that allows for the attachment of other devices, such as the template I'm talking about here.

I then embarked on the construction of my size, starting with the table. A rectangle containing a bolt whose pitch is 10 mm.

Then I built the adjusting lever containing its light 10 mm in width, and an axis of 6 mm in diameter. Plus a round that serves thick and attaches to the setting later. This thickness is changed according to the diameter size of the workpiece.

Here's here all the parts that make up the template.

Here's how the template is attached to the wheel.

After adjusting the workpiece against the wheel, it manages to make a perfect circle and good control measure with calipers and rotating the workpiece against the wheel while it rotates. We keep a perfect centering of the axis.


It remains for us to stick the design on the wood and cut each tooth to the jigsaw. Then make sure to sand it all and especially not to leave any "burrs" on the teeth, and the piece is finished! ... We can then check with the first template that I put here.