Kumiko Box Build Process

21/8/2022

The next job was to get started on a jig. This jig is made from a piece of plywood and a couple of offcuts, of beech and American black walnut:

The plywood was trimmed to have four square corners and straight edges and the walnut was drilled, countersunk and screwed to the plywood base. I drilled the edge of the plywood and screwed in some M6 threaded inserts:

I wanted a 5 mm deep rebate on one corner of the beech block and, for a change, I decided to do it with a #78 instead of the #45. The piece was tall enough that it was easy to hold in the vice for rebating.

The beech block then got three 9 mm holes drilled through. The size was chosen so that there was plenty of clearance and the position of the beech block can be adjusted:

With that, this simple jig was ready for use. The beech block gets adjusted such that the top surface is 10 mm above the plywood face.

The beech block hangs down a bit below the bottom of the plywood, which means the whole jig can be easily held in the vice:

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