Hi All
On the crank shaft of my 3" scale Foden, that I am currently building there are two gears that move along this shaft. They are driven on six splines. The following link to my website shows how I cut the internal gears with a modified keyway guide bush I made and a standard keyway broach.
I hope this is of interest and useful. I will also post a link to the crankshaft build in another post for those that are intrested.
Practical Engineering
The Home Engineer
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