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Forum topic by richgreer posted 01-10-2012 11:49 PM 887 views 0 times favorited 4 replies Add to Favorites Watch
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4541 posts in 3070 days

01-10-2012 11:49 PM

Does anyone know of a technique for easily determining the angle of a dovetail bit?

I have several dovetail bits in my collection. None are labelled. Is there a way to determine the angle without cutting some lumber and measuring the resulting cut? I see no way to measure the angle on the bit itself.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

4 replies so far

View SnowyRiver's profile


51457 posts in 3476 days

#1 posted 01-11-2012 12:02 AM

Rich, wouldnt a digital protractor work?

-- Wayne - Plymouth MN

View PurpLev's profile


8535 posts in 3644 days

#2 posted 01-11-2012 12:03 AM

you could indent the carbide/hss profile into a piece of paper (push it so that it leaves a mark) and measure that. assuming there is some variability to the angles it should be easy enough to determine if it’s 9 or 7 degrees.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Loren's profile


10380 posts in 3643 days

#3 posted 01-11-2012 12:11 AM

A dial caliper and a little trigonometry will tell you.

View Viktor's profile


464 posts in 3414 days

#4 posted 01-11-2012 12:20 AM

A = atan[(b-c)/(2L)]. This is in degrees.
Often dovetail angles expressed as ratio, then it is simply (b-c) : (2L). 1:7 and 1:8 are most common.

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