With just a flat faceplate it is possible to slip over to the sides beyond the stock being scarfed and chew into the guide rails. (See Figure 2-B). For this reason stop blocks are added to the masonite faceplate (Figure 4-A). Fasten the jig to the workbench, install the faceplate and you are ready for final adjustments. First, install a piece of fresh stock that you want to scarf. This stock must be as flat as possible and squared off perfectly on the end in the jig. Now establish an arbitrary line about 2" from the end of the jig (Figure 2-A) and align the squared off end of the stock directly on that line. If you have a large volume of scarfing to be done you may want to install a very shallow metal plate as an automatic stop at this point. Be careful because the metal plate can play havoc with a router bit. Once the Stock is aligned in the jig bring the pressure plate down and before snugging it down push the tip of the stock firmly down against the baseplate and apply the C-clamp as shown in Figure 2. Now snug down the pressure plate and you are ready to begin. At first, set the router for a shallow cut. You may find you have to make two passes toward the end of the stock because the router will ride up on the wood during the first pass and won't settle onto the guide rails until the second pass. Move the router from the thickest part of the scarf to the thinnest (Figure 5.) and do not cut into the stock with the router from the thin end. One foot back from your initial alignment line on the baseplate is where the end of your scarf joint should come. You can fix this in Continued on Page 37. FIG.4 Router with new faceplate attached-note stopblocks. (Al. FIG.3 <~, FIG.5 Router strokes should go from thickest to thinnest part of the scarf-do not move the router into the thin end. Note the use of the C-c1amp (lower left!, compressing the sides to hold down the thin end of the scarf. 28 ~ FIG.6 Note the notch (A) used for setting the router depth and the faceplace stop (Bl. A simple stopblock (as shown in the drawing) can substitute for the notched stop. THEATRE DESIGN AND TECHNOLOGY OCTOBER. 1974