General Tools and Instruments 870 v.2 - Manual (Page 46)

TWO WAYS TO ELIMINATE OR REMOVE THE “FENCE” WHEN CUTTING TENONS
Method #1
On a 3/4" thick piece of wood if you cut a 3/8" tenon with the 3/8" bit. This will create joints with no fence. Simply use
the corresponding bushings as directed on Fig. 27 on page 13 of the instruction manual for mortise and tenon sections.
Method #2
Using the same example as Method #1, if you wanted to cut a 1/4" tenon on a nominal 3/4" thick piece of wood you
would use the 1/4" bit and bushing to center the tenon and make the appropriate cut, but then, replace the 1/4" bit and
bushing with the 3/8" bit and bushing to rout off the fence. This will clean-up the joint leaving no remnants of a fence.
How to Adjust the Fit of the Mortise and Tenon
The E•Z Pro Mortise & Tenon Jig is designed to make a “line-to-line” fit of the tenon onto the mortise which insures a
tight close fit. If a looser fit is desired, this can be accomplished when centering the guide system (see “Centering the
Base Plate and the Quick Change Guide System” on page 5 of the instructions). Insert a fine wire shim of about a 1/32"
between the cone of the centering pin (R4) Fig. 4 on page 5, and the base plate before retracting the base plate onto the
centering pin and then tighten the base plate screws. Thus, the router base plate will be offset to create a gap equal to
the diameter of the shim between the mortise and tenon when cutting.
A practice cut with different size shims may be made to establish the preferred tightness or looseness of the fit.
Of course, as an alternative, the tenon may be sanded down to establish the desired fit as well.
If, at any time, you need additional help, feel free to call a wood joining expert at General!
GENERAL TOOLS & INSTRUMENTS
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