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Instrument evaluate: Mortising jig by Mortise Grasp

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Mortising jig
by Mortise Grasp

Versatile, inexpensive, and straightforward to make use of, Don Browning’s Mortise Grasp makes spot-on mortises accessible to any woodworker. The jig is at its greatest making matching mortises for slip tenons. Format is so simple as marking centerlines throughout the joint—the identical means you’d for a biscuit. Setup is straightforward, too. You begin by clamping the jig’s two thick wooden fences onto your workpiece and lining up your pencil mark with a scribed line. A skinny lip alongside the internal edge of every fence sits on high of the workpiece and ensures the fences are stage with one another.

The jig comes with a 1-in. bushing that you just screw into your router’s baseplate. As soon as it’s in your router, you match the bushing into the opening within the heart of the jig’s ingenious polycarbonate slide plate, which is the guts of the system. Together with your plunge router using on high of it, the plate slides backwards and forwards on the jig, guided by little UHMW plastic blocks that connect to the slide plate in varied positions and glide alongside steel T-tracks, making the mortising motion clean and exact. Those self same tracks information the 2 polycarbonate fences that act as stops, limiting the journey of the slide plate (and subsequently the size of the mortise). The really helpful upspiral carbide bit (provided by you) ought to correspond to the width of the mortise. To rout a mortise, you set the depth in your router, match the bushing into its gap within the slide plate, and hit the on-switch.

My large plunge router was very regular and straightforward to manage on the thick fences and broad slide plate, and the upspiral bit ejected mud so properly that I may rout a complete mortise with out reaching for a vacuum hose to clear chips.

As soon as your workpieces are marked and the jig is ready up, switching to a brand new workpiece and routing one other mortise takes a couple of minutes at most. The jig can accommodate workpieces as much as 3-1⁄2 in. thick, and rout mortises in a spread of sizes.

Setup is simple. The router rides on a round polycarbonate slide plate, and two adjustable fences limit its travel. With the slide plate centered, you set the stops by inserting two small shopmade spacers.
Setup is straightforward. The router rides on a spherical polycarbonate slide plate, and two adjustable fences restrict its journey. With the slide plate centered, you set the stops by inserting two small shopmade spacers.
Fast and foolproof. The bushing fits in the jig’s slide plate with zero slop. UHMW plastic blocks attach to the plate for various mortise locations. The blocks slide nicely in the jig’s T-tracks for excellent control.
Quick and foolproof. The bushing suits within the jig’s slide plate with zero slop. UHMW plastic blocks connect to the plate for varied mortise places. The blocks slide properly within the jig’s T-tracks for wonderful management.
Excellent results. Make a slip tenon to fit, and create strong joints in projects of all kinds.
Glorious outcomes. Make a slip tenon to suit, and create robust joints in tasks of every kind.

—Asa Christiana is a woodworker in Portland, Ore.

Photographs: Asa Christiana

From Superb Woodworking #291

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