Reply To: Stanley side rebate plane No. 79 blades sharpening
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Hello Antonio, Apologies for the delay…… we’ve had an extended power-cut in this part of the world. No juice – no internet!
I’ve just had a look at my version of that plane, which I bought new about 30 years ago….. it’s not in use every day, though works well. These things never work straight out of the box and always needs a little fettling – in my case, it was a long time ago, but just needed a decent edge put on the blades.
From your photos,
1 – The marks on the inner blade-beds are nothing to worry about. Mine has almost the same grind marks – plated over. I would strongly urge against widening the beds to compensate for a skew-angle problem further down.
2 – However, the blade should slide freely in its bed – I estimate that the sideways slack on mine is less than 0.25mm… so don’t worry about that either. Don’t widen the sides of the blade bed at all.
3 – I have checked the skew angle on my blades – it is 60 degrees, though there may be a tiny amount of latitude to suit the actual bedding seat in the plane block. The cutting angle of the bevels is very shallow – about 15- 20 degrees. The skew angles on yours are a long way out from that and there lies your problem.
4 – When everything is set up to cut correctly, with the correct skew on the blades and the correct amount of protrusion, the pointed tips are intended to stick out below the bottom line of the bed…… if they finish above the level of the base line, the blades would not cut correctly. On mine the protrusion is about 1 mm below on each blade. The mouth opening is about 2 mm.
May I suggest that you deal with one problem at a time. I think that the main issue is to get those blades right. Grind the skews at 60 degrees, next, as the bevels on the other side will be almost destroyed, re-establish those cutting bevels, sharpen the lot, back and front, and take it from there. If you then re-mount your blades, you – you may find a small pointed protrusion below the bottom edge of the plane – that’s quite normal.
I think that your plane will work.
good luck