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Jig Blog #1: a 67.5 degree Jig

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Blog entry by robscastle posted 08-14-2013 10:02 AM 749 reads 0 times favorited 1 comment Add to Favorites Watch
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In the process of building my Octagonal Slope Sided Serving Tray ( standby for this Project Post as its being a real nightmare to assemble) I needed too add biscuits in the butt joints to reinforce them and make the assembly more stable.

The basic details of the tray sides are that they have 40mm rails and 80mm ends with handles in them.

I wanted to ensure the joints were robust enough so decided to add “O” size biscuits to reinforce the joints.

Now getting a groove cut in the sides after they were cut for assembly took some thought.
I could easily elevate the rails to 22.5 deg but the alternating 10 deg on each end posed a bit of a challenge
After some thought I decided to use an edge banding clamp I had.

I attached it by counter boring the sides with 22mm Forstner bit in enough to hold the pads and simply screwing it on.

I inserted the rails under the third clamp and pivoted it left or right to align with the face of the biscuit cutter.

The base was MDF, and if it was to be used on a continual basis the base should be at least HDF or a similar durable material.

A note: Type “0” biscuits are 47mm 15 mm x 4mm the stock for the sides without handles is only 40mm.
So this means I had to cut part of the biscuit off, for this I use a pair of diagonal wire cutters.

Once the rails were aligned to the index marks it was a simple matter of cutting the biscuit recess.

After each end was cut the rail was reversed and the opposite 10 deg angle re aligned and the cut repeated.
I have not taken a shot showing the reversal of the stock, but its a reverse of the image of the stock shown.

-- Regards Robert



1 comment so far

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hjt

779 posts in 1883 days


#1 posted 01-24-2014 03:22 AM

Very innovated. I’ll check your project to see if you’ve posted it.

-- Harold

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