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Tony.A.S.S. wrote: The rebated joint should prove to be the most useful joint to use. The added area for gluing is only secondary to the most important part. When you rebate a panel you create a shoulder, and that is the key to accurate assembly. All ASS cabs were made working from inside dimensions. The importance of this is that when you buy 18mm ply, sometimes it can be 17mm or up to 19mm. When you work from a shoulder size, everything remains constant and you throw the tolerance to the outside.
The same principal applies to grooves. It must be very tempting to machine an 18mm groove and slide the panel in, but there is no control over size variations. So it is better to machine, for instance a 9 mm groove, and make a tongue on each side creating a shoulder size. It then doesn't matter if your groove goes deeper than it should because the shoulder that you create keeps everything constant. This is very important when assembling horn cabs. I hope this clear and helpful.
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you do it with a spindle moulder Chris not a routerchaudio wrote: Sounds like a good reason to have a router table, would take ages to do both sides and both ends of each panel with a hand-held router!
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