How It Works

To be effective, a slot mortiser needs to be able to move or l>e adjusted in three different directions:

1. in and out for the depth of cut;

2. side to side for the length of cut;

3- up and down for the height of cut.

Bob designed his slot mortiser with these movements in mind.

In and Out: The in-and-out movement is performed by the plunging action of the router. Mortise depth is controlled by the bit extension, which is governed by the router's own depth stops.

Side to Side: The router moves from side to side by means of three ball-bearing linear-motion pillow blocks that slide along two precision-ground steel shafts. The pillow

Workbench

SLOT MORTISER EXPLODED VIEW

Chassis back

Chassis side

Pillow blocks

Router mounting plate

Bearing plate

Workbench

SLOT MORTISER EXPLODED VIEW

Chassis back

Chassis side

Bearing plate

Pillow blocks

Router mounting plate blocks arc mounted on the back side of the bearing plate, and the router mounting board is attached to the front of that plate. The shafts are mounted within a chassis that is hung beneath a work surface.

Side-to-side travel is coarsely limited by the chassis sides. The maximum mortise length thus is about 4lA inches (exact length also is affected by the bit diameter). Fine adjustment of lateral travel within that range is provided by stops on a threaded rod that extends from the bearing plate through holes in the chassis sides. Lateral movement halts when the stop contacts the chassis side.

Q By adjusting the stops in and out on the rod, you control jg how far the router travels from side to side. By seating both stops against the chassis sides, you prevent lateral movement completely.

The stops are special disk-like nuts, often called check nuts by machinists. Because the adjustment rod has 16 threads per inch, the adjustment can be as fine as xAi inch. (A full turn moves the nut '/to inch, so a quarter-turn moves it only inch.) Putting two check nuts together allows you to jam one against the other to hold a setting.

Up and Down: Vertical position of the router Is established by the position of the router mounting board in relation to the bearing plate.The mounting board is secured to the plate with three plastic knobs with integral studs.The studs extend through slots in the board into inserts in the plate. To make a coarse vertical adjustment of the router, loosen the knobs and raise or lower the mounting board.

Fine vertical adjustment is made the same way lateral-travel adjustment is. A threaded rod projects from the bottom of the bearing plate. A check-nut stop on the rod

Clear the workbench for other work by pulling the mounting knobs and lifting the mounting board and router from the chassis. None of the vertical or lateral settings are lost when you do this, because you don't have to tamper with the check nuts to do it. With these parts removed, the mortiser no longer intrudes in the workspace. The chassis is out of the way beneath the bench top.

scais against a slotted plate screwed to the bottom of the router mounting plate. Turning the check nut (after the knobs are loosened) either forces die mounting board up or allows it to descend, thus adjusting the height of tile router in increments as fine as Vm inch.

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Woodworking Tools and Installation Tips

Woodworking Tools and Installation Tips

There are a lot of things that either needs to be repaired, or put together when youre a homeowner. If youre a new homeowner, and have just gotten out of apartment style living, you might want to take this list with you to the hardware store. From remolding jobs to putting together furniture you can use these 5 power tools to get your stuff together. Dont forget too that youll need a few extra tools for other jobs around the house.

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