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I have a production project in the plans which will require mortising and bent lamination, so I took the time to build a mortising jig and a beam compass. I will be test driving them after the project design is approved on Labor Day weekend. Mortising jig The mortising jig design is original, but has features borrowed from Jeff Miller and Philip Morley. It is approx. 16”x 30” x 5” with a ¾” x 5” x 36” base boards. The primary materials used are 4/4 maple lumber, ½” Baltic birch ply, and ¾” Prowood birch U-V ply. The red stops are made from scrap cherry painted. The jig can be easily clamped to a work bench and all of the accessories can be stored in the back of the jig. The work piece is referenced on primary, secondary, and ternary surfaces. The primary surface is made from two pieces of birch ply glued together. Clamping takes advantage of the Microjig dovetail clamp riding in a 14 deg. dovetail track groove. If your work piece is difficult to load and reference when the jig is up-right position, the jig can be positioned horizontally, so that it takes advantage of gravity loading. The clamps have a limitation of a 4” opening with 595 lbs. clamping pressure each. The router edge guide maple runner was machined at the same time the guide groove spacer. During assemble a paper shim (~0.004”) was added to allow the guide to run parallel to the work piece. All surfaces received a light coat of Johnson paste wax. Beam compass The compass was built from scrap ¼” x ¾” x as needed cherry material. It can make an approx. 14” radius. The design is not original. Danl
Well it is that time again. We have our last meeting of the year a week from tomorrow that is when I give the members something I made as a present. This year I made a beam compass for that once in a lifetime time they have to mark out a circle too large for the standard Scissor compass. There are many ways to do this,a string and pencil, not very accurate, a stick with a pencil taped to it and a nail driven thru,that will work. But not as good as a fancy made wooden beam compass that should last a lifetime and be handed down to a youngster who says "Whats that thing for"? The first picture is the mock up and the rest is the build. Herb