I have a matched pair of old wooden tongue and groove planes, similar to the ones Paul used in one of his videos.
I need to sharpen the blades, which are in a bad way with facets in all directions.
The blades go into the planes at 45 degrees. What angle should I sharpen the blades to?
It is exactly the same as a blade on a normal plough plane.
The blades are mounted bevel-down, so that any bevel angle of about 25 – 30 degrees is sufficient. You are unlikely to be able to mount these blades securely in a modern jig with any hope of a positive fit, so do it by hand.
The backs of both should be flattened and polished at the cutting point and the bevels straight across, especially on the tongue cutter; rounded corners will not cut accurately so spend some time getting them crisp.
On wooden planes of this type, it is only worth bothering about the bit that cuts at the front and that the section of the blade that is sitting between the body and the wedge is straight and flat. The rest will likely be quite manky and unless the sight upsets you, not important.
When mounted, there should be an equal amount of cutting tip of the tongue plane blade protruding below the sole.
Are the planes a matched pair from the same manufacturer?
As you have probably not used them yet, and while you have them apart, check that the groove blade does NOT fit inside the gap on the tongue blade by sliding them together on a flat surface. If it does fit inside, the finished boards will not slide together and will need trimming with a shoulder plane.
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