[TowerTalk] Which Thrust Bearing to Use

[Thomas Noel]

Absolutely. The circumferential expansion far exceeds the tiny inward radial expansion.

Thomas W Noel
KF7RSF

> On Dec 9, 2016, at 6:23 PM, charlie at thegallos.com wrote:
> 
> <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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