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  1. Hola! I originally introduced the idea of a compound scarfing jig waaaay back in something like 2007-2008. A few people around ProjectGuitar.com have successfully used the idea, and a few people around the interwebs have taken it on also....some clearly took it directly (including images and zero credit) however convergent evolution means it would surface of itself at some point anyway. It's all cool. Rising tides floating all boats and that. The idea was based off the established idea of a router scarfing jig, but improved to allow for twisted headstocks and even string pull for multiscales that do not have a nut perpendicular to the centreline. Normally the treble side of a multiscale is pulled backwards, causing the headstock to "twist" clockwise as you sight towards it down the fingerboard. The higher the difference between the two outer scales, the larger the twist. This creates problems for necks with tilted headstocks as the scarf needs to incorporate a new compound tiltback angle. Thankfully, there is a simple solution to this which isn't much more difficult than the standard router scarfing jig. Firstly, let's look at the standard router scarfing jig: At their most basic, they consist of a box bounded by two guiding rails. On top of this rides a router with a wide sled which ensures it maintains contact over both rails. The neck and usually the piece being scarfed are cut at the same time. Depending on the final orientation of the scarf, one piece has the glue joint surface cut whilst the other has a facing surface finished: Pretty standard fare so far. To make a compound angle, the sleds are simply offset from each other. Rather than riding on the faces of the sidewalls the sled now runs on the edges; the inner wall on the furthest forward and the outer wall of the furthest back. The correct offset corresponds to a line drawn from each contact point on a flat plane: When glued up, both halves produce the expected compound scarf.
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