Here is a very specific tool made for shaping the top of a tone hole chimney.
This is for tone holes that will be covered by a key. It is crucial that the pad of the key has a neat contact with the wood in order to avoid any leakage.
The contact surface is actually reduced to a single ring if the tone hole has a slightly spherical top.
Here is what we want to obtain :
And here is how it is done :
First, a guiding pin is turned down, given the diameter of the tone hole.
And then a custom ground shaping tool is used to cut the spherical shape of what will be the cutting edge.
Then I use my milling attachment to drill 6 transversal flat bottom holes with a small carbide end mill cutter.
This will form cutting teeth
Then I use a cutting disk on a Dremel to grind down the back of each tooth.
Here I'm using my transversal drilling attachment on the lathe with this tool.
very nice toolmaking. I plan to make a similar spotfacing tool with a 1.5mm guide pin, to uniform primer flash holes on cartridge cases. The commercial ones are the wrong shape -- just a #2 center drill in a holder-- and can thin the case too much.
Is there a description of the milling attachment on your website?
Not on my web site, but here on my, yes:
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