I have my own way of figuring the miter for a ‘bastard angle’ (not a conventional 90, 45, or 22 1/2) when cutting trim but am curious how the rest of you do it.
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Those that want to spend the $$$$ use a Bosch angle finder. Myself, a large bevel square, check the angle on a speed sqare, test cut and fit to fine tune.
Ken Hill
a piece of crown or something like that?.... hold up scrap piece, draw line along edge on ceiling, same on other side, where lines intersect show where to cut.
Homewright,
I use a short piece of the trim. Make light marks along inner & outer edges at corner, from both sides involved. Then hold " real piece in place, and mark the two intersections on their respective edges. Then it's just connect the dots. Works very well for extreme acute miters, although the angles often exceed the capabilities of the miter saw. In that case I use a sharp 10 point handsaw, and clean up with my block plane.
Brudoggie
The way I figure the angle is to take my sliding T-bevel, lay it in the corner and lock it to the corner angle. Next, I'll transfer the angle to a sheet of paper letting the edge of the paper be one side and mark the angle. Fold once on the mark, then fold the whole thing exactly in half. This is what I use to set my miter saw angle. If you don't have a T-bevel, just take the paper and lay it tight to one wall letting the excess lap into the corner where the corner lands roughly half way along the edge of the paper. Crease it into the corner, then do the second fold to get the same thing.
It works on outside corners too but you have to cut the paper roughly half way across then set the paper against the outside corner so the corner lands at the end of your cut. Crease the paper in both directions, fold, then fold the whole thing exactly in half. This is the fastest, easiest way I've found and it's never failed to give me great joinery.
Edited 5/2/2002 6:00:24 AM ET by Homewright
Edited 5/2/2002 6:01:31 AM ET by Homewright
Edited 5/2/2002 6:05:33 AM ET by Homewright
Thanks to Joe: http://www.josephfusco.com/FHB/crownscript.html
I use a bevel square to match the angle on the wall. I then put the bevel square on the bed of the chopsaw and slide the saw to match the angle. Read the angle, then reset the chopsaw to half the angle. Cut upsidedownandbackwards.
Thirty-four tweaks later, it's a perfect fit!<g>