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Adam Variable Diameter Drill
August 5th, 2008 12:37 AM
I found a new use, of an old pattern wood drill today at OSH.

The bit brace users might remember an old tool, called an expansion bit, that was used to bore holes of various diameters in wood.

Like the fixed size Auger bits, a lead screw helped draw the cutting tool into the wood.

A single-spurred arm was adjusted for the precise hole size desired and although used infrequently, was very useful for an "in-between" sized hole.

Well, today I found the power tool powered equivalent tool, made by a well known tool making company named IRWIN.

The tapered-square tang on the end is now a hexagonal shaped end, for better 3-jawed chuck grip.

The tool is shorter, for control.

And, the screw-fed tip is replaced by a much more controllable solid triangular shaped tip.

This is going to be just perfect for drilling the holes for my set of new Craftsman, 1/2 inch drive, 6 point, deep sockets.

:)

At $25 it isn't bargain priced.

But, with a hole range of 5/8 to 1-3/4 inches, it's the right tool for my task.

There's even a second model drill bit that will drill up to a 3 inch diameter hole.

Irwin still sells the bit brace style expansion drills, right next to these two bits.

I was lucky enough to find one of the old vinyl packaged sets.

With two spur cutters per bit, the owner needs some way of keeping all the parts together.
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