Reply To: Tyzack router plane missing the blade.
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You’re very lucky… the Tyzack router is a direct copy of the Preston router that went into oblivion when Preston went bust in about 1932.
Mine is equipped with the three original blades: they are all 72 mm in length and 6.5, 9.5 and 12.2 mm width at the cutting tips. (That’s ¼, 3/8 and ½ inch).
The shanks are square all the way down to the foot with the foot section being machined to shape. When mounted in the router the sole of the cutter, which is ground and polished flat, presents to the wood at an angle of about 3 Degrees. This isn’t critical, but just ensures that only the cutting tip is in contact with the wood, not the whole sole of the foot.
The cutter shanks are all 7.7 to 7.9 mm square – this dimension is not critical to the exact mm…. call it 7.8 mm. It just needs to fit firmly within the slots on the posts and the retaining clamp. Check the fit on both ends and the centre post.
The adjusting slot is on the rear of the cutter and is 7.0 mm down from the top, (which is cut square). It is 4.5 mm wide and 4.0 mm deep: basically it just needs to be a clearance fit on the rim of the adjusting nut, so it’s best to measure from this on your plane.
Good luck