The Shop > Tools
Sharpening Drill Bits
sbwhart:
I've got one of those but found I can do it better freehand, my Dad taught me how to do it many years ago, once learn't never forgotten. As an experiment showed my own son how to do it, he's never shown any interest in machining, but after 10 min he was making a reasonable job of it. Is it an heredity skill thing :scratch:
Stew
Darren:
I have to admit as said before I do mine freehand most of the time, I was just wondering if a proper setup would be better :scratch:
Seems it's swings and rounabouts, as in it depends who you ask :med:
DavesWimshurst:
For years have done it freehand. Then built a Potts drill jig but it didn't work right. Tried other methods such as "four facet' jigs with better luck. Eventually took another look at the Potts jig and found some construction errors. When corrected it gives very good results for a standard grind. Some jigs won't give the correct amount of relief behind the cutting edge unless the drill extends the right amount away from the pivot axis of the jig.
The four facet drill seems to work better but I don't have a jig for larger than 1/4 inch drills. That said I will hand grind drills, its not that hard to get a drill that works well but it will probably drill oversize due to small errors between the two cutting edges.
Dave
Bernd:
Dave,
Any chance of a pic of the Potts drill jig?
Bernd
bogstandard:
--- Quote ---That said I will hand grind drills, its not that hard to get a drill that works well but it will probably drill oversize due to small errors between the two cutting edges.
--- End quote ---
It is for that very reason that I discard all my old drills.
Unless you can get them machine ground, they are not worth size for size the metal they are made out of. 'Somewhere close to the size I am after' is not a saying that is in my vocabulary.
Four facet is definitely the way to go. Designed to start true and drill true without the use of a centre drill, and much lower cutting forces.
I will buy those before any other.
John
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