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Restoring Planes: Metal and Wooden

  Plow Plane Arm Repair by Jim Harvey 1 of 6  

Broken planes is a subject that comes up often in the Facebook Unplugged Woodworking group.


Stripped threads are common on wooden planes that use threaded arms to position a fence. They usually break next to the armís foot as that is where the fence is most often needed.

This is my example, it will be my repair experiment. Years ago I demoted it to a kerfing plane by replacing both skates with a blade cut from an old rip saw. I screwed an inch and a half spacer block on the fence to skip over the defective threads, which worked, but is awkward and heavy. Iím going to simply cut out the defective section, which will shorten the range of the plane, but who plows grooves six inches out anyway.

These are the two threaded arms. Each was made from a single piece of wood with a 3/4″ O. D. threaded section. The challenge is to securely and accurately splice the amputated threads back on the foot.

So my plan removes the stripped part, then makes a half inch round tenon on the end of the good threaded rod, with a matching half inch mortise in the foot. The two parts are reassembled with a 1/4-20 threaded steel rod pulling them together, I think it will be at least as strong as the original solid wood part.

Most of the work was done on my Delta DP-300 drill press on which I have carefully aligned the press table square to the quill.

The first task was to make a fixture to hold the threaded arm accurately aligned with my drill chuck. I had to file the hole in the drill press table a bit to get the threaded arm to pass up through easily from the bottom.

To make the alignment fixture, I screwed a bit of 2◊4 to a piece of scrap, clamped that to the press table, then ran a 3/4 inch Forstner bit down as far as it would go, I had to finish the bore with a longer spade bit. I removed the drilled 2◊4, cut a slot on the table saw, then installed two screws to help clamp the threaded arm in place. It did take a small amount of sanding to get the threaded arm to pass through.

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Sandusky Planes

Combination Planes


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