I found that several of the auger bits (Jennings pattern) that I recently
purchased are not accurately sized. Anybody know what the size tolerance
should be for the diameter at the spur and of the auger itself?
No, I don't know but I do know there are ANSI and ISO standards for
twist drills and I presume there would be for other varieties as well.
I'd start looking in those directions if it is really that significant.
Of course, what a Standard says is of no benefit if the manufacturer
isn't following it... :)
Just out of curiousity, what's the application that requires such
precision and what kind of measurements are you getting?
I'm getting 1/32" of error in the spur diameter on some bits and up to 1/16"
( or more) on the auger. This is fairly critical in a 1/4" hole, and it
isn't very good in 3/4" either.
The application is using doweled tenons and in general dowel joints. I've
used brad point bits up to now but need to move to use of brace and bit. I
have only one bit that is an antique, but picked up a set of bits that
disappointed me in the variations in their dimensions.
I will seek out the ANSI standard, if it exists.
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