I have been following a few of the drill sharpening jig builds with interest but one thing has me puzzled. I was always taught to bring the cutting edge of the drill into the grinding wheel face with the shaft pretty much parallel to the ground. This creates a centre chisel edge of 45 degrees. I notice with the jigs however (and I think the Tormek jig is the same) the cutting edge is introduced to the wheel with the shaft lowered some what. I like the accuracy that these jigs provide and wouldn't mind having a go at making one up but need to understand the geometry of the shaft angle before I make any plans.
Why the angle and what is the angle? Does this not affect the chisel angle adversely or is this a completely different sharpening geometry to the more traditional style (which I believe is what I was taught)?
I did a bit of reading on drill geometry and this site details pretty much what I do (but in far more detail when it comes to clearance angles - I tend to wing it when it comes to that).
http://ift.tt/1C2DQ3c
Why the angle and what is the angle? Does this not affect the chisel angle adversely or is this a completely different sharpening geometry to the more traditional style (which I believe is what I was taught)?
I did a bit of reading on drill geometry and this site details pretty much what I do (but in far more detail when it comes to clearance angles - I tend to wing it when it comes to that).
http://ift.tt/1C2DQ3c
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