[TowerTalk] Which Thrust Bearing to Use

jimlux jimlux at earthlink.net
Fri Dec 9 22:04:29 EST 2016


On 12/9/16 6:45 PM, Thomas Noel wrote:
> Absolutely. The circumferential expansion far exceeds the tiny inward
> radial expansion.
>
There's no radial inward expansion at all. everything moves "out"
the outer edge moves out "more" than the inner edge.


> Thomas W Noel
> KF7RSF
>
>> On Dec 9, 2016, at 6:23 PM, charlie at thegallos.com
>> <mailto: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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>



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