This sprocket requires both X and Y axis to have 200 mm travel which is more than the 180mm travel of my mill. The blank was mounted on a rotary table so that three teeth were machined.
The blank was rotated 40 degrees and the machine code 9 times to give 27 teeth.
The profile on the inside of the teeth was done the same way.
All the spokes and the fluting were cut as one
operation without using the rotary table.
There is one drive sprocket per side. They are each machined from a single billet of steel. First the billet was turned on a lathe to thickness the spokes and finally the teeth and spokes were cut on the mill.
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