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Project Information

I decided to try my hand at handcut dovetails. This marking jig has a 1:7 ration. I made it out of 1/4" hardboard that is smooth on both sids. I cut 2 pieces into 2.5" squares. I then cut my angles on one piece and cut a dadao in the other. Then I glued together making sure they were at 90 degrees. If you look at the youtube of Rob Cosman's version ($24.95 on his web sight) you can see how to use it. Laying out for the cuts is sooooo easy with this jig.

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good idea well done.
 

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I have a similar hand made jig for marking dovetails… made by LJ Ed… He made up a bunch for our hand cut dovetail workshop in 6, 7, 8 ratios. You're right, they make quick accurate work of it.

Nice work on yours… good job… simple yet very useful.
 

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that is the angle of the dovetail. 1:6 ratio means over 1" and up 6 " to determine your angle. to calculate an angle, from the corner of the board measure up 6", and make a mark on the edge. from the same corner, measure over 1" and make another mark. draw a line between these two marks and you have an angle. most dovetails use a angle based on a 6,7, or 8 to 1 ratio. softwoods should be a 1:6 and hard woods can be 1:8 ratio.

russv
 

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the explanation for calculating the ratios is much appreciated. thank you! i'm just starting on my hand cut dovetail journey and am about to make a couple jigs.
 
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