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- Feb 26, 2020
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I experimented with milling the basic shapes out of HSS. With a carbide endmill and really tiny cuts roughly 1% of the tool diameter it can be done.On the decorative bead form tool, how to you go about grinding that accurately into HSS ?
Seems like that would be tricky.
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Trial of a diy keyway broach. I think the geometry is not really working good. Buying it would have been easier and better. But it was the proof of concept that I can cut features into HSS.

Shaper tool for internal gear cutting. That went relatively well. (not everything is milled, some portions are ground) 6 mm diameter HSS rod as stock.

8 mm gearhob to cut wormwheels. HSS bar single point threaded on the lathe with a modified carbide insert. (I had to make quite a view of them, because the things chip easy) Then milling the flutes with a carbide endmill and touching of with grinding wheel.
It is not perfect (mainly dimensions) but it worked to some extend.
So what should I say? HSS vs Carbide ... both! I could not make a carbide tool with the method. I could not practice the method without carbide tool.
Greetings Timo
p.s. for the radius, "just" drill a hole and grind part of it away. (just: I tried it with the drillpress, ruined a 4 flute endmill and a ball endmill :-( ), a spade drill (made out of the broken endmill) worked.

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