On Tuesday, 24 December 2019 16:27:28 UTC, The Natural Philosopher wrote:
On 24/12/2019 14:16, Cursitor Doom wrote:
Once a drill bit is sharpened it's
never quite the same again.

It may be soi for you, but people who did this regaularly could often
make them as good as, or better, than original.

they're the same if you grind them the same, better if you grind them better, worse if you don't do it right. Drill bit grinding is odd in that some people have no trouble doing it, some never can.


However these days the labour cost is many times the cost of a new drill
so one doesn't sharpen.

IME I can grind a whole pile in 5-10 minutes, and make them better then new.

With small bits, 3mm & under, geometry ceases to be of much importance for wood drilling, almost anything works. Anyone who's no good at regrinding could start on small ones.


NT