Posted by Bradracer18 on October 21, 2012 at 19:11:30 from (188.8.131.52):
In Reply to: Drill Doctor posted by Popinjohn on October 18, 2012 at 17:30:13:
haha, I think I've used on a few times. Seriously, only a couple times. At work, we have a "nice" (read expensive) one however my dad just has the generic small one. Neither seem to work great.
I don't understand why you can't get them good on the grinder, no maybe not perfect, but darn close! I guess I didn't know you guys were looking for perfection. We drill holes all the time, and are looking to drill them the size that the bit is (say 1/4" =.250). Well, some might not know, but a dull bit will actually drill a larger hole, I've seen it drill a 0.020 larger hole before. A sharp bit seems to drill within 0.0005 to 0.001 of the size we are looking for. And, that's a hand/grinder sharpened bit.
We actually sharpen them on a disc grinder, seems to work the best. You must also realize, that I've been taught by someone who has done this almost daily for 15 years. He is much faster and better than me (thus my comparison to the drill dr.)
And, on a side note for the original poster, we tell the bit is sharp by when you stick it into the metal, 2 spirals must come off. If only one comes off, its only cutting on one side and isn't sharp!
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