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Forum topic by richgreer posted 01-10-2012 11:49 PM 807 views 0 times favorited 4 replies Add to Favorites Watch
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richgreer

4541 posts in 2541 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

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SnowyRiver

51452 posts in 2947 days


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

Rich, wouldnt a digital protractor work?

-- Wayne - Plymouth MN

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PurpLev

8523 posts in 3115 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.

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Loren

8314 posts in 3115 days


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

A dial caliper and a little trigonometry will tell you.

View Viktor's profile

Viktor

456 posts in 2886 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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