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I add the Incra router fence to the TS-III fence and center it over the bit.
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I could have used the
settings I came up with last week, but, instead, use my sample piece to set the fence to
the correct distance and the bit to the right height.
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Once the fence is
positioned and locked, I adjust the scale to zero.
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Before I go much further, I
mark the insides of the legs. This decision is purely a matter of aesthetics, but I don't
want to be cutting sliding dovetails on the wrong sides.
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Since the sides are
the same width as in my test of last week, I use the sample block also to set the Incra
Stop. Using a good sample, like this, does make things simpler and, hopefully, foolproof.
Good wood is expensive. I don't want to make any errors at this point.
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I have backed the fence
off (that is why I set it to zero) and have installed a 3/8" straight bit. I will use
that to cut most of the groove, before I use the dovetail bit to make the final cut. With
the fence's zero point marked, I can move it back to change bits and, then, return
it to the exactly right point without fear of error. To me, this is a real benefit to the
Incra System repeatable accuracy.
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I cut the groove,
with straight bit, making several shallow passes. I have used the Rout-R-Lift's hand crank
to adjust the bit down from the final height. In doing this, I have counted the number of
turns of the crank. I went down exactly 10 turns from the set height, and now I keep track
of the turns as I raise the bit and make the passes. When I have added 10 turns, I know I
have reached the right height.
Note that I am cutting only the one groove on each leg. I will complete this
one and then reset the fence and do the other.
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After I have cut the
straight groove to depth, I switched to the dovetail bit and made one pass. Even in the
dense oak, the dovetail bit cuts smoothly. It would have done nothing but burn if the
straight bit hadn't done its work first.
There is no way to get around this two step method. The Rout-R-Lift and Incra
System make the task very easy and accurate.
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With the one dovetail
groove done on each of the legs, I use my sample block and move the fence to the other
dovetail position. I lock the fence here and reset the scale to zero.
I then repeat the operation of cutting several shallow cuts with the straight
bit, followed by the dovetail cut.
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So here I am making that
final dovetail cut on the last of the four legs. Even with all the setting and resetting,
this leg cutting operation took about 20 minutes. What I like best about it is that it is
a safe way to cut the legs, and they came out perfectly.
Now it's time to cut the sides to fit.
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