Fine Woodworking magazine for the month of July/August 2014 issue 241 has plans for a Smart Jig for Pattern Routing by Tim Celeski to hold a template and work-piece when pattern routing. Over the years I have made occasional jigs to do such things but they have always worn out, broken or fallen by the wayside. So I decided to make the one described by Tim in the magazine. Credit for the design goes to Tim and full details are in the magazine.
Construction
Essentially it comprises:
- a base 10" x 17" made from 18mm plywood (preferably baltic birch 3/4")
- a clamp plate 8" x 17" made again from 18mm plywood
- a hardwood fence, in my case an oak scrap, glued onto the clamp plate
- 8 off 3/8" captive T nuts
- 4 off 10mm (3/8") washers
- 2 off 3/8" star knobs
- 2 off self adjusting toggle clamps
- 8 off M5 x 40 long countersunk head socket screws with nuts and washers(or equivalent imperial).
The hardwood fence is glued to the top plate and cut away to clear the star knobs when they are in the forward position.
Drill 2 columns of 4 holes (8 in total) for the T-nuts in the base plate. These start 3-3/8" from the front of the longest edge of the base plate on 15" centres. The remaining 3 pairs of holes are drilled inline with the first two on 1-1/4" centres.
Next counterbore these holes on the underside of the base plate with a Forstner bit to clear the head of the T-nuts. Then the T-Nuts are inserted from the underside and hammered home.
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Underside of base plate showing the
counterbores for the heads of the T-nuts |