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A Kinshiro on the Cheap



About a year ago I posted a couple of cutting gauges that were based on the Kinshiro cutting mortice gauge: http://www.inthewoodshop.com/ShopMadeTools/CuttingGauges.html

These cutting gauges were the Western version - a pseudo Japanese cutting gauge – the Kebiki profile but the knife was made from a HSS drill rather than a bent steel blade. This has a significant disadvantage, in that the cutting edge lies in board and, as a result, visibility is reduced. There is another advantage to the bent steel blade, which I shall demonstrate later.

Note that the Kinshiro is a mortice gauge but may be used as a single knife gauge for tenons and dovetails. There are a number of other uses for this type of gauge, such as slicing banding.

The Kinshiro are no longer available. I got to thinking that I could upgrade a cheap version of a Kinshiro-type gauge into a decent alternative to be used specifically as a single cutter, ala dovetail gauge.

Tools from Japan sell the Large Ryuma for $17. This comes with 2 blades for mortices ...

The bones are decent but need work. The body is about 3/4 the thickness of the Kinshiro. The blades are a little rough but have potential. The wing nut is a disaster - too difficult to adjust with one hand. And how to adjust one blade with one hand?

Here is the completed modification ..

Alongside the Kinshiro ...

There is more registration depth than in the original ..

In addition to the lamination at the front (I used Jarrah - what else?!), another lamination was added to the blade carrier to replace one blade and raise the remaining blade flush with the top.

The back of the blade shaft was serrated to create resistance and enable it to be pushed with the thumb.

A brass knurled knob replaced the wing nut.

The blades need to be ground and polished on both sides. Two blades enable one to score lines in either direction, that is, with the knife's bevel either towards or from the gauge. The finished blades are on the right side ..

What I particularly like about this style of knife is that setting the gauge for dovetailing is so much easier. To set for an depth that is exactly that of one side, simply place the gauge on top of the board, and drop the knife to the table. Tighten. Done.

And two are better than one ….

Regards from Perth

Derek

June 2013