Sharpening Drill Bits

Does anyone have experience with the Drill Doctor? Does it really work
well? What is the best place to buy one or where can I get a good tool to
sharpen my bits?
Also, does anyone have advice on where to get drill bits for drilling into
1/4" mild steel? Even with reduced speed and constant lube, my bits are
dull after only a few holes. Cobalt seems to work better but still doesn't
last long. Anyone know where to get carbide bits for drilling into steel?
Reply to
Brendan Jones
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Brendon, The Drill Doctor will work fine is the hands of a tool person, but like most things, it is not a substitute for skill. Your problem is probably tool abuse and no machine will fix that. Normal HSS will drill hundreds of holes in mild steel and still have an edge. I obviously am not where you are, so there is no way that I know for sure, but I think you are spinning the drill far too fast. Slow down your speed, try to keep an even pressure and angle on the drill, use enough pressure to generate a continuous flow of chips, feel the tool cutting, listen to the noise, use cutting oil and don't let the drill or the work get hot. Steve
Reply to
Steve Lusardi
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Reply to
What does sharpen small bits well?
I drill safety wire holes in DIN 10.9 Metric bolts (better than SAE Grade 8) and I only get 10 or so holes per carbide drill bit, 3/32 if remember correctly using cutting fluid.
I use the above mentioned bolts in constructing the airplane engine in the link below.
P.S. Abrasha, I wish I had your precision machining talents when I was working on "gundrilling" two 6" x 1/8" Angle of Attack probe for measuring angle the wing is at to prevent a stall. I had to get a machinist from Allied Signal to give me a hand. Bummer when you can't do it all yourself.
Reply to
Bart D. Hull

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