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  • How to Sharpen Used and Dull Drill Bits (By Hand!!)

    This is a well done tutorial for people not familiar with doing this. Everything is covered. Most machinist's I know would not use a belt sander except for bits to large to sharpen the entire lip at once on a 1/2wide grinding wheel. As the included angle of the bit grows, from 118 to 135 degrees, it will be better suited for drilling harder materials but will need more force to drive it into the work which is an important consideration when using a hand drill with larger bits where predrilling a small pilot hole is a good idea. When sharpening, sneak up on the actual cutting edge and look for the sparks to come over the top of the lip. This is the point when your pretty much done unless the bit was severely damaged. As it says here, after a few dozen bits, you should get the hang ...

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    This is a well done tutorial for people not familiar with doing this. Everything is covered. Most machinist's I know would not use a belt sander except for bits to large to sharpen the entire lip at once on a 1/2wide grinding wheel. As the included angle of the bit grows, from 118 to 135 degrees, it will be better suited for drilling harder materials but will need more force to drive it into the work which is an important consideration when using a hand drill with larger bits where predrilling a small pilot hole is a good idea. When sharpening, sneak up on the actual cutting edge and look for the sparks to come over the top of the lip. This is the point when your pretty much done unless the bit was severely damaged. As it says here, after a few dozen bits, you should get the hang of moving the bit away to dip in in water and re-positioning it properly at the wheel every time. Alternate every stroke or two on each lip to keep the metal removal pretty even. This helps to not sharpen one side more than the other. With practice, you can sharpen the bit while preserving the original geometry of the tip and remove a minimum of material between sharpenings. It's pretty easy to sharpen a drill to cut .015" oversize. To get it to cut less than .005" over is much more difficult. If the bit is not too dull and a 'touch up' is all that's needed, if a larger, properly dressed grinder is used, it might not get to hot to hold before your done. NON-PROFESSIONALS SHOULD NEVER WHERE GLOVES WHEN AT A BENCH GRINDER.

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