Identifying Correctly Sharpened Drill Bits - Drill Master 500X User Manual

Identifying Correctly Sharpened Drill Bits

(and what to do with those that aren't!)
Heel
Cutting
Edge
Once you have reached spark-out (no more grinding noise at all)
take a look at your drill bit. The chisel angle should be between
1:00 and 1:30.
9:00
chisel gets too close to 12:00, the relief will be negative.
Too much relief will cause an oversized hole diameter and rapid bit
wear. Too little relief will limit feed rates, slowing down the drilling
operation or in extreme cases cause the drill not to perform at all.
If chisel angle looks to be about 2 o'clock, re-align bit 1-2 ticks to
the right of the 118° mark (toward the minus sign) and re-sharpen.
If chisel angle is up to about 2:30, align 2-3 ticks towards the
minus sign.
If chisel is about 12:45, it's at the low end of chisel & relief, re-align bit
1 tick to the left of the 118° mark (toward the plus sign) and re-sharpen.
www.drilldoctor.com
Correctly Sharpened Bits
The entire surface from the Cutting Edge
Chisel
to the Heel will have a finely ground
Tip
surface without indentations. The Heel
will always be lower than the Cutting
Edge (positive relief ).
*Look at the bit: Hold
the bit up and look at it
with the cutting edges in
line with the horizon (or
parallel with the 9:00 and
3:00 position imagining a
3:00
clock's face).
Now look at the chisel.
scribe
It should be between
line
1:00 and 1:30. 2:00 is too
far advanced, and if the
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