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Woodrat 45 degree Jig for Slotting Mitres.
John Bailey recently sent me a note and some photos of an ingenious jig that he made up to use on his WoodRat. I have included his notes and some photos here.
"This jig is enables slots to be cut into the face of mitres allowing ďTanseli WafersĒ to be inserted for jointing purposes.
Wafers work the same way as biscuits. They are made from the same compressed wood, which swell on the application of glue to provide a strong face to face joint. They are especially useful for joining mitres at the corners of bookcases etc.
The jig consists of two triangles of MDF, screwed to a plywood face (or similar), to allow the Woodrat router plate to be mounted on the plywood.
The MDF triangles are supported by small lengths of alloy angle screwed to them to enable the whole to be fixed to the top of the Woodrat. The jig is mounted using the normal router-plate fixings. The holes in the plywood permit the Allen bolts to be inserted from above. The rear fixings are made with 6mm pins let into the bottom of the raising plate and pass up through the alloy angle.
In practice the raising plate is required to lift the angled plate clear of the Woodrat (or at least it is with my version, which is a bit rough to say the least.) I always start with a quick version to see if it works and I promise myself that if the prototype works, then I will make a better one. Sadly, this never seems to happen and the original version just gets modified to suit, so it never looks any better!
With the router set up, the mitred wood can be offered up vertically in the camlocks and the slots or multiples thereof (for thicker wood more than one wafer can be used in parallel slots) cut to any length using a bearing guided slot cutter. Thatís what I like about these tanseli wafers. The joint faces donít need marking out for biscuit positions, as they run the full length of the mitre, stopped before they exit the edge of the wood.
Normally, I hold the router back on itís mounting plate with a big elastic band from a hook on the wall behind the Woodrat, so that forward pressure is needed to bring the router into contact with the mitre face, with the star knob in place just in case of catastrophe. Youíll see what I mean if you try this. The elastic wasnít very photogenic so I left it off the photos.
I hope with the aid of the photos you will see how it all goes together. Itís not complicated and youíll probably see immediately how it can be improved beyond all recognition.
It looks to me from the photos that John has actually cut the mitre with a 45 degree router bit and then used a slotting bit for the wafer. I am guessing that his home made base plate has a larger opening to allow the slotting bit to pass through.
Yet another of John's clever ideas---- keep 'em coming!
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