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I'm surprised that you could measure the voltage if it's static build up, static is normally very high voltages but tiny charge or current. I think the danger from static is normally sparks in flammable environments.I wonder if your speed controller negative is drifting away from neutral?Be careful Russell
Interesting way you made that taper, Dwayne.
I've not had any experience sharpening milling cutters, but surely the cutting edge should be a thin parallel strip, rather than the broad, triangular feature that you have achieved?
Better looking than my current crop of countersinks! A long while back I got a set of those one hole countersinks. I think they were made out of lead. Instantly on use they lost all edge and wore a groove in themselves. I have a 5 flute countersink that loves to chatter and produce razor sharp metal shards that embed in fingers, as well as produce a countersink angle that fits no flathead screw ever produced. Clearly, countersinking is an art I have never mastered.