On 7/4/10 9:38 PM, george9219 wrote:
On Jul 4, 1:02 pm, wrote:
On 7/4/10 10:41 AM, riverman wrote:



However, the female end is less clear. Think of a donut (as the female
end of a ferrule resembles a donut in cross-section): first instincts
may say to heat the female end to expand it, but when a donut expands,
the hole actually gets smaller. SO heating the female end may make the
ferrule tighter.

I'm afraid that you're wrong. Heating the female ferrule will cause the
hole to expand. So it's best to heat the female ferrule and cool the
male ferrule.

--
Cut "to the chase" for my email address.

What RW said. Heat the female ferrule. The wall section of the female
has less mass and will expand faster than the male section.

The donut analogy is misleading. A cooking donut doesn't expand like a
"normal" material undergoing classic thermal expansion. A better analogy
is that the cross section of the ferrule would expand like a
photographic enlargement, in all directions, hole and all. That's why
mechanics sometimes use a torch to free a stuck nut. (I wouldn't use a
torch on a ferrule, but I'd use a XC ski waxing iron, carefully. You're
in Sweden, right?)

In any case, I wouldn't hold much hope for the thermal method of getting
the ferrules apart, although it's worth a try. Brute force is the
answer, I think, and if you aren't strong enough you need to find a way
to get mechanical advantage (or more hands to help).

BTW, riverman, is this a real problem you're facing or is it a quiz
question?

--
Cut "to the chase" for my email address.