<anip>
> I don't agree. If the hole is large enough to just clear at -40C, when
> heated the entire mass will increase in volume. The OD will get larger
> and
> the hole will get smaller and become tighter against the mast.
>
>
> 73 de
> Gene Smar AD3F
>
>
I guess your science teacher "Back when" didn't do what mine did. He had
a steel ball (on a handle, and a steel ring (ditto). At room temp, the
ball would NOT fit through the ring - maybe 1/32 of interference. You
then took the ring, put it in a bunsen burner, and hot it hot (didn't even
need to be red) - the ball fit though perfectly
Yep, the way materials expand the hole gets bigger. We do it in the shop
ALL the time, heat a gear etc to make the hole bigger to drop over a shaft
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