rrmccabe said:
Michael Kellough said:
A short base is a limitation only on analog levels/inclinometers.
The zero out function effectively makes the shortness of the base irrelevant.
Well I don't agree with you there but it really isn't about the actual possible accuracy of the gauge itself but its use in a woodshop environment.
Now I realize there are exceptions but with a
2" base it only takes 17 thousandths to make 1/2 degree. So the slightest variation including a tiny piece of wood dust will change the results by 1/2 a degree. My
miter saw top is far from perfect as with any material I work with.
But for the most part I agree with what you are saying.
You're right, a little digital inclinometer is no substitute for a long level or straightedge.
The only practical application I see on a compound miter saw is to set the bevel.
Since you can't quickly adjust the base of the saw all that counts is the relative angle
of the blade to the base and the small size of the DI makes it easy to fix to the blade.
The old school way of setting the bevel of a compound miter saw (without relying on the built-in scale)
is to set an adjustable bevel gauge (preset to the angle you want to achieve) on the bed and slide it close to the blade.
Then adjust the saw bevel until the blades meet evenly.
There are multiple problems with that approach.
The moving table of the miter saw is often not co-planar with the broader support table.
The bevel gauge might not fit on the moving table alone and will therefore tilt.
(the workaround for both of the above is to set the bevel gauge
on a smooth flat board that spans across the full support table)
The saw blade has teeth that interfere with positioning the bevel gauge blade.
The saw blade blank might not be ground flat, or could be warped etc.
If there are warpage issues with the blade or runout of the arbor then the bevel gauge blade has to be consistently set
to the same point of rotation every time and allowances made when setting the angle of the bevel gauge.
None of the above issues are relevant with the zero-out feature of the DI. Even with a warped blade,
doesn't matter if the DI is set to the + or - position of rotation as long as the blade is not rotated after zero is set.
With the saw head returned to 90* attach the magnetic base of the DI to the blade and zero the DI.
As an alternative you can clamp the DI to some other part of the saw head, even the handle,
it doesn't have to be in the same plane as the blade and it doesn't even have to be flat
as long as it is secure and doesn't move when the button is pushed.
And of course it isn't necessary to start from 90* or 0* as long as you know how many degrees you want to move.
I like to make adjustments from O*, it's just easier to look at with less stuff displayed.