I want to make a miter sled similar to Incra's where you slip a miter
gauge into a miter track on the sled.
To do this, I need to attach a runner to a sheet of plywood. No
problem since it doesn't have to be exactly parallel to the ply. But
on the top of the sled where I plan to put a T-Miter slot it has to be
parallel to the runner in order for the miter gauge to be parallel (to
the blade) when it's installed. How do I ensure that the T-Miter track
and runner area parallel to each other? Incra does this with an
aluminum channel that has both the runner and miter slot machined in it.
Put the runner on the bottom of a sheet of plywood. Make sure the plywood
extends past the blade of a table saw.and trim off the excess. Now you're
left with the edge of the plywood parallel to the runner and you can mark
for your miter slot based on this edge.
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