General Tools and Instruments 870 v.2 - Manual (Page 12)

7. Routing the Mortise
Tip: when routing the mortise, it is advisable to increase the depth of cut slightly more than that of
the tenon to allow space for glue to be put on the tenon before inserting it into the mortise.
The Guide Bushing [R-3] fits the Mortise Template [2] (Fig. 24) exactly to prevent it from wandering
out of line. It will be used for all mortises regardless of size.
1. Before turning on the router, place the Guide Bushing in the end of the mortise template and
slide it through the template to be sure it moves freely. (Fig. 25)
2. With the Guide Bushing in the end of the template and the router base squarely on the jig
surface, turn the router on.
3. Plunge the router and guide the router bit through the cutting process.
NOTE: We recommend cutting the mortise in successive overlapping plunges to depth and
then repeatedly move the bit back and forth to clean up the mortise slot.
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Fig. 24
Fig. 25