On Thu, Mar 27, 2025 at 06:54 PM, Peter Brooks wrote:
I see that ball nose end mills go down to 1mm.
Ball nose cutters are available from 0.2 to 1.0 mm in 0.1 mm steps, see Ebay:
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A sharp bottomed 90¡ã groove will hold any size string. If you take a small flat needle file and make sure the safety edge is really flat by honing it down you can file a very sharp groove and ease it out one side at a time until it is just the depth you need. Cutting with a square or triangular (three square) file always leaves a radius in the groove, generally bigger than your finest string gauge. The honed edge of a flat file gives a very sharp corner - and doing this also improves the file for many other jobs too.
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I feel that cutting the groove to exactly the same width as the string is a mistake - what happens if you can't get just the same gauge of string one day?
