Jet 708580 JBM-5 1/2 Horsepower Bench Mortiser
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Tools and Hardware Reviews of Jet 708580 JBM-5 1/2 Horsepower Bench MortiserCustomer Review: A Great Bench Top Mortiser
After building two mission style end tables, I knew there had to be a better way than the drill press and chisel to make mortises. I did a bit of research and decided on the Jet...cost and reputation were factors. This is my 3rd jet tool...the JWSS-10 SuperSaw and a dovetail jig are the others. The machine is easy to set up, and does nice mortises. My 1/4" bit leaves a small hump on one side of the mortise...which I attribute to the bit. Unless it is a through mortise, you'd never know it was there on a finished piece. I set the hold down just a touch loose, and can easily slide the workpiece from one cut to the next. You'll need to go slow on the first cut, and back out the bit a couple of times to clear the chips. After that, you can move right along. Is this a production floor model machine? No. Did it cost [money]? No. Does it make good mortises? In my opinion, yes, and it is worth every penny of [money].
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At only 44 pounds, the Jet 708580 is sturdy but also easily maneuvered, plus it reverses on its base to allow for mortising in long stock. The 4-3/4-inch head stroke is great. Bits are easy to change. Just flip open the steel door on either side (other models on the market often have doors made of flimsy plastic) to gain easy access to the chuck. And, thanks to the 4-inch chuck key, there's little chance of banging or scraping your knuckles while switching bits.
The mortiser's feed handle adjusts so you can choose the most comfortable position for each application, and it also offers a quick-setting depth stop and a removable toggle switch that prevents accidental or unauthorized use of the tool. It's set on a heavy-duty cast-iron base with four predrilled mounting holes. Other features include a three-jaw drill chuck that keeps a positive grip on mortising bits for chisels up to 3/4-inch in size, two hinged side doors for easy access to the chuck, and a reversible column for mortising larger stock. It's backed by a 5-year limited warranty.
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One Jet 708580 JBM-5 benchtop mortiser, one hydraulic cylinder, one handle, 3/4- and 5/8-inch chisel bushings, one spindle extension, one chuck key, one table, hold down, fence assembly, screws, and owner's manual.

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