Hi, Here are a few pictures of the overhead guard on my JET contractor's saw. This version mounts to the ceiling straight up from the blade - it's fairly recent, but I think I'm gonna like it.
First a shot looking at the back of the saw:
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a closer look:
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guard itself:
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mount:
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guard is 3/8" polycarbonate (Lexan, I think, but maybe a different brand) solvent-welded. The shape is like Gordon Sampson's, but a little longer because I wanted to "capture" the Biesemeyer splitter. The support is
3" and 4" Schedule 40 PVC. The height adjustment is just a 3->4" adapter that allows the lower 3" section to slide up into the upper 4" section. The
3" section is solvent welded to a 3/4" square of PVC, which is then bolted to the guard itself. There is a branch out that will eventually connect to the dust collector, and then a closet flange lag-bolted to a stringer on the ceiling.
Total cost, including a $20 piece of polycarbonate from eBay, was about $40. I initially tried an upright PVC post at the far end of the extension table with an arm running the length of the table. Didn't work; way too much flex/sag in the six foot horizontal length of four inch Schedule 40. This one seems like a better design. Hope this gives you all some ideas! Lewis