19 February, 2014

Precision Block Cutting

I am fairly new at installing crown molding. I am doing crown in a small office with 125 deg. Sloped ceiling and at the ridge it levels off 9" horizontally instead of coming to a point. I used crown blocks at the base of the slopes to eliminate transition pieces and simplify the project. I calculated all my angles for cutting but my problem is the length. The distance of the four piece that run the slope between the block and the ridge piece is 6'-6". I mark the distance on the top of the crown, then flip and reverse the piece so the top of the crown is resting on the miter saw base. Now my length mark is on the bottom & I cannot line up my blade for a precision cut. How is this done. Today I found out that… I've had the very same problem before the easiest way is to make a jig. I'm not talking about a standard jig that holds the crown molding in place but a jig in the shape of a equilateral triangle because the wall of the jig must hit the saw fence at a 45 degrees angle. There are many ways you can make the jig but you should make it as tall as your miter saw will allow. You will have to clamp the jig to the fence and to the table of the miter saw if necessary (depending on how big you make the jig) . You could use a piece of wood 1×10 cut at 45 degrees this piece would lay flat on the table area of your miter saw then you will have to nail a another piece if 1x perpendicular to the 1×10 cut at 45 degrees nail a For long piece set up something behind you or get any one to hold the molding while you cut it. See the flickr crown molding image for a simple diagram. I hope this helps I'm a finish carpenter in Richmond Va. PS check the jlc online forums for better information on this .


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