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Naka-nuki shoji base kumiko

The kumiko bases for this set of Book 2 shoji are now assembled, and it’s on to the internal patterns - kiri in the centre, and asa-no-ha in the top and bottom bands. The initial CAD drawing is in my blog entry of 29 Dec (with a couple of minor design changes).

There is a set cutting sequence for the vertical and horizontal kumiko so that the total number of cuts required is kept to the minimum, thereby reducing the possibility of error. This sequence will be explained in detail in the book.

An interesting challenge for you would be to look at the CAD design and the photo below, and think how you would approach the cutting, and see if you can work out a cutting sequence in which the same cut is not repeated, other than when there are too many kumiko for a single manageable cut. Unfortunately, though, you’ll have to wait until the book is released to find out if you’re correct.

The vertical kumiko pitch is 13.9 mm, which means the space between the kumiko is 9.9 mm. So the kumiko can snap very easily if the marking and cutting accuracy is even the slightest amount off.

The internal squares for the two
asa-no-ha bands are 23.8 x 23.8 mm, so there’ll be some quite small asa-no-ha pieces.

Naka-nuki

This is quite an advanced shoji design, but the whole idea of Book 2 is to take the basic work I covered in Book 1 to a completely new level.
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