I often find
that I have small places with tear out in inside radii, and I have
no good way to get in there and deal with it.
It recently occurred
to me that I ought to be able to convert small wrenches into just
such a tool. Here is how I did it. I started by finding a
selection of otherwise worthless wrenches. I cut these near the
middle, and then welded a tang onto the wrench.
Next is a picture of the set waiting
order to get the box end half of the wrench sharpened, I had to
first anneal the wrenches. Then I used a tapered reamer in my brace
to cut the inside bevels. Then I used a mounted stone in my die
grinder to grind out the inside and smooth the bevels.
picture is a mounted stone. The stone is man made and mounted on a
1/4’ shaft. You can shape the stone most any way you like by
spinning it in a drill motor or die grinder against a spinning bench
how I removed the remainder of the teeth inside the wrench.
ground the outside of the box until it was flat on the outside and a
sharp edge was formed. I found that this makes it a lot easier to
sharpen. Then I went to a sharpening stone to create, and to finish
the outside bevel.
The inside bevel was sharpened with a small round
stone, about 5/16” diameter. Finally I buffed the outside with my
hard felt wheel.
sides of the boxes are sharpened. Here is
a picture of my set of mini scorps complete with handles made of
have cut off the handles very close to the box to make these more
attractive, but I wanted people who see these tools to know
immediately that they are made from wrenches.
smallest size is 6mm, and the largest is 9/16”. I did not do
anything to heat treat these tools after they were annealed. I found
that the steel holds an edge and is relatively easy to sharpen as
about 8 hours of labor invested in this set. The wrenches were bound
for the recycle bin, so they cost nothing. Compare that to the cost
of buying new tools. New ones would cost more than $200, and I doubt
that they would work any better. Besides, I like making tools
whenever I can.
the Old Millrat in Riverside, CA
Tips from Old Millrat - James D. Thompson