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All Replies on Tear out prevention with Leigh dovetail jig

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Tear out prevention with Leigh dovetail jig

by altenewbie
posted 01-16-2018 12:45 PM


3 replies so far

View LesB's profile

LesB

2075 posts in 3803 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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altenewbie

3 posts in 492 days


#2 posted 01-16-2018 06:43 PM

Thanks for your response, Les. At the moment, I have a call into one of the techs at Leigh to ask about the possibility of using MDF or, perhaps, two 8” boards as backers for my 14” wide blanket chest sides.

My router is also a Porter Cable 690 and I have been researching a foolproof method of assuring that the base plate is centered. If I could guarantee centering, I don’t think the lowering/raising of the straight bit would be a problem. I’ve seen the Jasper universal base plate with centering pin as well as a Bosch centering cone. I will ask the Leigh tech his opinion on these issues and get back to you with his response. Again, thanks for the reply.

Ken

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LesB

2075 posts in 3803 days


#3 posted 01-16-2018 09:18 PM

Ken,
If you can put the straight bit in without rotating the motor in the base the alignment to the center of the dove tail, the straight bit and the cuts will remain the same so the cuts should match; as long as the guide is not loose in the base plate. The problem occurs when you change the orientation of the motor and base by rotating them, even a little.

-- Les B, Oregon

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