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An idea for drill sharpening jig
Bernd:
I have to second what Darren has said. Although mine was new.
The intersting thing about yours is the way you plan on rotating the drill.
I'm hoping this experiment will work out for you. I will keep watching your progress. I figure when my Drill Doctor doesn't work any more I'll build one like yours.
Bernd
sorveltaja:
I tested the jig with 4 mm drill. Result: that ~4.7mm pitch is way too long. Meaning, that the axial feed is also too high.
Seems that if this method is in use, there should be matching thread for every size drills. Without doubt, it wouldn't be simple, or even practical.
I guess that it needs some kind of compromise to simplify whole thing. Assuming, that requirement isn't industry-level cutting speeds for the drills.
Anyway, next I'm going to try with milder, 1mm pitch, which should be closer to what I'm looking for :borg:.
tinkerer:
I believe 0 pitch is what will be required.
sorveltaja:
0 pitch.. hmm. If burnout of the drill is desired, that would be fine. With cutting oil you would get even nice smoke cloud.
Since I'm not going to make any smoke signals(at least not from drilling) in the near future, I'll rather prevent myself from using 0 pitch.
tinkerer:
I am speaking of pitch as in a screw. You must be talking about rake, or I just have no understanding of which aspect of the drill you are changing from 4.7mm to 1mm. My not understanding may be attributed to everything on a drill bit except diameter is usually presented in degrees. It appears to me that as you turn the bit 180 deg, you are also moving it in a screw like action. If I am wrong please accept my apologies and I will continue to follow your process.
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