https://www.youtube.com/watch?v=oEzVEs306s4
I've long thought that a good way to make a multi tooth form cutter to mill some manner of shape needing a saw blade would be to index it and cut the form as shown here and then to cut the fronts so the relief is built in as shown. But I never thought about the idea of doing it with a jig like this that makes use of indexing holes.
While this one used a flat disc with holes I can see it working with a round bar tool where indexing divots are first drilled into the sides in the shank portion. Then set screws into the spot drilled starter do the indexing for the turning and other subsequent steps.
This quick sketch shows some sort of tool for something being held in the green holder in the lathe and the tool itself is spot drilled for three positions.
The jig would be used both in the lathe for the initial cuts as well as in the mill to make the gullet cuts. Making it from stock which can be held in a 5C collet seems like a good idea as well. Gives me more options for how to hold it in the mill.
I've often thought about making the clearance cuts this way for multi tooth cutters but never really thought on how best to ensure even indexing of the lobes. Clickspring's indexing pin and holes inspired me.
I've long thought that a good way to make a multi tooth form cutter to mill some manner of shape needing a saw blade would be to index it and cut the form as shown here and then to cut the fronts so the relief is built in as shown. But I never thought about the idea of doing it with a jig like this that makes use of indexing holes.
While this one used a flat disc with holes I can see it working with a round bar tool where indexing divots are first drilled into the sides in the shank portion. Then set screws into the spot drilled starter do the indexing for the turning and other subsequent steps.
This quick sketch shows some sort of tool for something being held in the green holder in the lathe and the tool itself is spot drilled for three positions.
The jig would be used both in the lathe for the initial cuts as well as in the mill to make the gullet cuts. Making it from stock which can be held in a 5C collet seems like a good idea as well. Gives me more options for how to hold it in the mill.
I've often thought about making the clearance cuts this way for multi tooth cutters but never really thought on how best to ensure even indexing of the lobes. Clickspring's indexing pin and holes inspired me.
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