Reply by LesB

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Posted on Tear out prevention with Leigh dovetail jig

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1909 posts in 3677 days

#1 posted 01-16-2018 06:08 PM

The backer board is necessary to prevent tear outs. I use a piece of MDF most of the time and just cut off the end when I need a new surface to cut into. Also the way you cut into the wood can help. Make a shallow scoring cut on the first pass and as you finish the cut go from right to left or against the rotation of the bit.
The biggest problem is when I use my 690 Porter Cable router the motor rotates in the base for height adjustment. If the guide that is mounted on the base plate is not precisely centered to begin with (it almost never is) when you change cutter bits from dove tail to straight bit and rotate the base to adjust the cutting height an eccentricity is created and the subsequent pin cut will be slightly off. This can occur on other routers if the guide is not securely locked down or somehow move a little. This is usually less than a mm but it can make for a bad fit.

-- Les B, Oregon

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