"Doug White" wrote in message
. ..
The collegiate pistol team I help coach has two Russian target air
pistols that have broken cocking linkages. I have replacement
parts,
but I need to disassemble a linkage that has a swaged pin in it.
The
ends of the pin are even with the sides of a piece I need to rescue
undamaged. I had originally planned on drilling/milling out the
center
of the swaged part enough to press the pin out, but I discovered
that
the pin is free to rotate. There's nothing exposed enough to hang
onto
that I don't need to largely cut away.

I can probably grind out the swaged bit VERY carefully with a
Dremel,
but it's going to be tedious & fussy.

The pins are about 5/16" in diameter, and each end has a shallow
drilled
out section. It looks like they pressed ball bearings into the ends
to
spread them. The linkage the pin goes through is countersunk on
both
sides, so the swaged bits hold everything together.

There a picture he

http://www.pyramydair.com/blog/image...inkage-web.jpg

The pin is the large one with the dimple just left of center in the
image.

The only way I can think of to physically hang onto the pin is to
make
an expanding collet that goes into the drilled out pocket on the far
end
of the pin. That is going to be tenuous at best, and it's a lot of
work
to fabricate for a high likelihood of failure.

One other option would be to crazy glue everything together, mill
out
the swaged bit, and then soak it in acetone until the pieces free
up.
That assumes the crazy glue can handle the machining forces.

Before I drag out the Dremel, does anyone have any better
sugestions?

Thanks!

Doug White

You may be able to angle the Dremel such that the pin rotates slowly
as you open up the dimple, so you can thin the wall fairly evenly all
around enough that it can compress when you drive it out. Supporting
the far end may help.

A drill bit held at an angle may deepen the hole while it spins the
pin. I wouldn't use a good bit from a set for this.