A few miter gauges have a 1/10 degree vernier, so the precision is
available (though perhaps not to 70 degrees, directly). What the
accuracy of the gauge is, including miter slot slop, may be another
Come on, people - have you forgotten how to work without using miter gauges
that have built-in stops???
Another way to explain is this:
Your blade is 90 degrees relative to your fence, right?
Now subtract 19.4 degrees. Whatcha got now?
That would work if the miter gauge indicated 90 degrees but mine only goes
to 50 degrees so...
What are you going to subtract 19.4 degrees from on your miter gauge fence?
0 degrees or 45~ 50 degrees?
The problem here is that the typical miter gauge has no 90 degree setting.
What you think is a 90 degree setting is actually a 0 degree setting.
Any setting on the average miter gauge is going to result in a cut that is
wrong unless you add a jig or template to hold the work's long edge 90
degrees to the miter fence and then set the gauge to 19.4 degrees.
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