Reply by Loren

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Posted on Ripping @ 50*

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10401 posts in 3648 days

#1 posted 06-01-2013 10:36 PM

Good idea from Charlie.

You could rip to 45 and do the rest of the angle
on a jointer or with hand planes. On the jointer
you set the fence to 45 and tape a strip of wood
to the workpiece so the angle of presentation
of the work to the cutterhead is a little steeper.

A little geometry lesson though – in order to
make a miter more obtuse than 90 degrees
you actually want more obtuse cuts on the individual
ends. To make an 80 degree corner you subtract
80 from 180 = 100 and divide by 2 = 50.

In order to get a 100 degree (obtuse) corner,
subtract 100 from 180 = 80/2 = 40.

Table saw normally cuts angles subtracted from 90
degrees, so to cut 10 degrees off 90 (100 on
the acute corner and 80 on the obtuse one)
the blade is angled 10 degrees.

Two 90 degree ends butt together to make
a 180 degree flat joint. Remove 1 degree and
the angle becomes an obtuse miter. It is
the acute, pointy miters that present challenges
on the table saw. Old variety saws used
by patternmakers have tilting fences as
well as tilting arbors.

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