Clinder ring abrasives problem

Jewelry Discussion
1

I don’t know what causes it, but twice I have had silicon ring
cylinders fly off the mandrel, which continues to spin around, but
is all bent out of shape. Fortunately I was not hurt, although the
ring cylinder hit my thumb as it flew off and landed across the
room.

Obviously it came loose from the mandrel for some reason.

I am using cylinders which I got a number of years ago from a
friend. The package shows that they are from JSP #CX1061. They have
a 1/16th in hole for the mandrel. The mandrels are from Rio,
#333-103----and have a 1/8" hole and are made for 1/16th inch
cylinders.

I screw them on tightly, but after just a bit of use they suddenly
fly off. I am about ready to discard them rather than run of risk of
hurting myself.

Can anyone shed any light on what causes the cylinder to become
loose from the screw?

Thanks for your help.
Alma

2 
I screw them on tightly, but after just a bit of use they suddenly
fly off. I am about ready to discard them rather than run of risk
of hurting myself.

Have you tried epoxy?

Paf Dvorak

3

Thanks Paf. Using epoxy is a great idea and I will try it. Alma

4 
I screw them on tightly, but after just a bit of use they suddenly
fly off. I am about ready to discard them rather than run of risk
of hurting myself.

Is the flex shaft running in the same direction to unscrew them? If
so (And assuming your tool is reversible) reverse direction.

Kay

PS nothing worse than running a Lathe in reverse and suddenly having
a 50 pound chuck unscrew while it is still spinning and you are in
the same room…

5

Are they breaking apart or spinning off? Could be too tight, or old
and brittle. If it’s the cylinders you might need the nut behind it
to keep the cylinder from threading on too far. If the mandrel goes
in too far it breaks the abrasive wheel.

6

You mentioned the mandrel bends out of shape, too, when the cylinder
flies off. Are you applying a lot of heavy pressure when using them?

It is possible that by applying too much pressure, the screw could
have enough of the silicon pushing against it to come undone. If
excessive heat is reaching the mandrel, that could potentially soften
it enough to bend out of shape, but so could excessive pressure.

These are only guesses, though, since we can’t ‘see’ what’s
happening when it occurs.

7

My foredom flex-shaft only runs in one direction. It cannot run in
reverse. Also, I amcareful when ordering the mandrels that they are
notfor the reverse flex-shafts, but for mine. When the cylinder flies
off, it leaves the mandrel bent into a right angle. The metal of the
mandrels are so soft that I can hammer them back into shape, but I
discard them rather than take a chance using them. Alma

8

You’ve been working out too much. Lighten up you’re pressure on the
mandrels. Sometimes when you put you’re flex shaft in your pan it
drops in and could bend the mandrel before you use it. Could that be
it. Does it run smooth before this happens.

9

Rebecca, you may be right. Perhaps I am applying too much pressure.
Thanks for your analysis. Alma

10

Shannon, the cylinders do not break apart, they just fly off.
However, the Mandrel, which stays in the flexshaft is bent to a
right angle. Alma

11

Alma,

Are you putting the mandrel all the way into the shaft? Only the
cylinder should be sticking out. If placed all the way in, I don’t
think you would be able to get the tiny bit of shaft sticking out to
bend to a right angle…

Janet in Jerusalem

12

Janet, I think you have solved the problem and that I did not put
themandrel all the way in. It is a distinct possibility. Thanks for
your response. Alma

13 
 My foredom flex-shaft only runs in one direction. It cannot run
in reverse.

Alma, you can always just reverse it and use it with your other
hand. Jerry in Kodiak