Luthier CNC

[bluesking]

Hi Bluesking
Broken drills/taps in non ferous materials can be dissolved using Alum solution.
https://www.google.com/url?sa=t&rct=...9aX0rtzdbxJhZP
Also when tapping go with the recommended size from your Zeus book ie 4.2mm but use a solid(no flute's) spiral tap.
Regards
Mike

Nifty solution, thank you.

I used a 3 flute straight M5 tap with some cutting oil. Did about 50 holes with no problems at all (once I’d drilled everything to 4.2). What would be the advantage of solid spiral tap?