Fly cutters are commercially available in a number of styles and sizes.
As has happened before, I wanted to gain experience and add to my
tooling, so a made a series of fly cutters as shown below.
See Article Number 36 for a fly cutter design using carbide inserts.
Below are two versions with different bit angles. Both are made from
free-cutting steel and have a shank diameter of 12 mm. The bits are
HSS, 6 mm diameter.
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