Incra Dovetails - cuts going with the bit - Router Forums
 
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post #1 of 9 (permalink) Old 01-31-2012, 09:14 PM Thread Starter
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Default Incra Dovetails - cuts going with the bit

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Well it is unfortunate that my first post is one where Im having issues...but I guess that's how it goes
I've done some basic dovetails on the incra before; but this is the first time I'm having this specific problem....Im making some 1/2 blind dovetail joints and cutting the pins is a breeze. Im having problems when it comes time to the tails.
The template Im using provides me with roughly 1/2 a pin at the top and bottom of the board, and when I go to cut the relief in the tail all is well and good until I get to the very last cut. At this point I have roughly 5 1/4" from the edge of the bit to the fence. More importantly, now my direction of feed is with the bit rotation. Knowing that this would potentially turn out bad, I tried sneeking up on it - but you can imagine what happened
Any suggestions are greatly appreciated. As this is a 1/2 blind, there is no real way of trying to go 'with' the bit direction that I can think of. My next idea is to clamp down a fence on the bit side to help, but that can get squirlly too...
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post #2 of 9 (permalink) Old 02-01-2012, 08:24 AM
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I always use a scrap backer board to prevent tear out. With the backer and both tail boards clamped to the right angle fence I haven't had any issues. Remember to make the dovetail rabbit cuts first and place the two good boards face to face.
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post #3 of 9 (permalink) Old 02-01-2012, 08:37 AM Thread Starter
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Thanks for the help !

To clarify what I was trying to describe....The setup to cut that last cut puts the wood between the fence and the bit to trim about 1/4" off the outside edge...Clearly a bad idea setup that way. Unfortunately I see no way around this other than a climb cut from the opposite direction...Or adjust my template.
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post #4 of 9 (permalink) Old 02-01-2012, 09:14 AM
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Steve, you are correct of course, but with the boards clamped to the right angle fixture it should not be an issue. It has always worked ok for me. Guess you could clamp a scrap board on the outside to give the bit something to cut, but I have not found it necessary.
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post #5 of 9 (permalink) Old 02-01-2012, 09:54 AM Thread Starter
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Hrmmm....Maybe Im using the wrong word...hehe.

I thought that the 'pins' were cut using the right angle fixture (thus making..well..pins), and the tails were cut w/o the right angle fixture, with the board surface flat on the router table ? Im talking about the latter, where the board face is flat on the table.
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post #6 of 9 (permalink) Old 02-01-2012, 10:17 AM
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Quote:
Originally Posted by Steve-H View Post
Hrmmm....Maybe Im using the wrong word...hehe.

I thought that the 'pins' were cut using the right angle fixture (thus making..well..pins), and the tails were cut w/o the right angle fixture, with the board surface flat on the router table ? Im talking about the latter, where the board face is flat on the table.

Oh, in that case reverse the 'A' and 'B' cuts. Put the half pins/tails on the board that is cut flat!

In Incra's material they refer to the flat board cuts as pins.. I never can keep those things straight. But reversing A and B cuts you will have no cuts on the outer side of the flat cut boards!
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post #7 of 9 (permalink) Old 02-01-2012, 10:42 AM Thread Starter
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Yep, exactly ! Sorry for the confusion...

The problem I have though...is I like the look of the cuts being on the outside. Admittedly however - I like my fingers better....
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post #8 of 9 (permalink) Old 02-01-2012, 11:04 AM
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I guess you could cut the boards over sized and rip to final width after cutting the dovetails.. would give you the look you want, Steve.
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post #9 of 9 (permalink) Old 02-01-2012, 11:18 AM Thread Starter
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I guess you could cut the boards over sized and rip to final width after cutting the dovetails.. would give you the look you want, Steve.
Fantastic....thanks for the suggestion !
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