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Homemade Drill Bit Sharpening Guide


Drill Bit Sharpening Guide
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BUILDER:
Krafty on farmassistant.com.au
DESCRIPTION:
Homemade drill bit sharpening guide constructed from a pair of hex-headed bolts mounted together.
RATING:
(24)
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Dec 21, 2016 5:52 PM
crazypj
I first saw that using two nuts pinned together in 1974 while learning centre lathe. I was teaching 'machine shop' at MMI (Motorcycle Mechanics Institute) and showed many of the students, some who had been 'in engineering' for as much as 27 yrs. ( I think he may have been a CNC machine minder?). 120 degrees may not be 118 but a 120 degree sharp drill is far superior to a 118 degree blunt one. You have a sight line built in between the two nuts (or bolt heads) to judge if shank is lined up properly
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DIY Drill Bit Sharpening Guide - comment on how to build a Drill Bit Sharpening Guide - 10 comments
crazypj says:
Dec 21, 2016 5:52 PM
I first saw that using two nuts pinned together in 1974 while learning centre lathe. I was teaching 'machine shop' at MMI (Motorcycle Mechanics Institute) and showed many of the students, some who had been 'in engineering' for as much as 27 yrs. ( I think he may have been a CNC machine minder?). 120 degrees may not be 118 but a 120 degree sharp drill is far superior to a 118 degree blunt one. You have a sight line built in between the two nuts (or bolt heads) to judge if shank is lined up properly

Anonymous says:
Aug 21, 2016 4:02 PM
Would work if your angle is 120 degrees... The bits I commonly use are 118 and 135 degrees (though there are other angles available). I believe the poster below talking about 82 degree is confusing it with countersinks, most commercial grade hardware has an 82 degree countersink while aviation hardware is usually 100 degree. I haven't seen a standard bit that was 82 degree.

Anonymous says:
Jul 30, 2016 2:25 PM
This will not work, the stand American drill bit is 82 degrees while this checker will be 120 degrees, but in retrospect at least your angles will be even.

fonz says:
Jul 21, 2016 9:22 AM
Does it work?

fonz says:
Jul 21, 2016 9:22 AM
Does it work?

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