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Posted on Incra Poisitioner - why set the scale to 0 for scoring pass when the bit protrudes?

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1554 posts in 3095 days

#1 posted 12-20-2013 11:43 PM

Yes, he makes it a bit confusing. I suck at explaining, so bear with me.

In the first part you are making the tailboards. On a regular dovetail jig, the back of the tails is rounded. With the LS POsitioner, the backs are flat, you just rout out a rabbet. That is what he is doing with those first cuts, making that rabbet.

Here’s the fun part – it doesn’t have to be exact, just close to what the template says it should be. The template ruler that you slid into the long piece has a “guestimate”. For the one he’s doing in the video he says it is 7/32. He makes those multiple passes to sneak up to 7/32. But it doesn’t have to be perfect. You can be 6/32 or 8/32. And since you started with a light cut under 1/32, and set it to zero, and it locks every 1/32, you’re going to end up with 6, 7, or 8/32. And that is good enough for that step because:

When the tails are done you move on to the pin boards. They use a stop setup behind the bit that limits how deep you cut the sockets. You make the first series of cuts, and then do a test fit with the tail boards you already made, and then you adjust the stop so it makes the sockets just deep enough for the tails to sit in flush. (It should be a bit further in the video).
Hope that helps a bit.

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