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Tip
#53
Shopsmith Ovararm Pin Router
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here for a printer friendly version of Tip-
Pg. 1-4, Pg
5-8, Pg 9-12, Pg
13-16, Pg 17-20, Pg
21-23
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Joinery
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Figure
22-27.
Some of the structural joints that can be formed with
the routing system. Click on image for larger view.
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The overarm
mode of the routing system is an excellent way to make a wide
variety of structural joints for cabinets and furniture projects
of all types (Figure
22-27).
The router
bit's high operating speed allows it to make cuts that are
cleaner than those produced by a table saw. And in some cases
(like the mortise for a mortise and tenon), it will perform
operations that simply cannot be done on the table saw.
Generally,
most joints are formed by using un-piloted straight bits with
the workpiece being guided by a fence, miter gauge and/or
stops to control and limit the depths-of-cut. This capability
provides the advantage of repetition, ensuring that every
cut will be identical to the last.
As with
other routing system operations, it's often best to back up
the exit sides of through cross-grain cuts with scrap blocks
(or to allow sufficient extra stock so that some can be removed
after the initial cuts are made) to prevent unsightly tear-outs.
In some
cases (such as square-cornered mortise and tenons), the corners
of the joints will require squaring with a chisel after they've
been cut. However, if you're producing a rounded mortise (which
is perfectly acceptable in most cases), you'll have to round
the ends of the matching tenon with a file or pocketknife
to match the mortise. Another option is to cut the tenon shorter
so its square corners will slip inside the rounded ends of
the mortise.
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