[TowerTalk] Metal Thermal Rate of Expansion

[Lux, Jim]

On 10/4/21 7:50 AM, Mark - N5OT wrote:
> I hate to be a big ignoramus, but why, if this is not an issue for 
> Gedas' 10 GHz mount, is sweating joints that seem to be similar to his 
> design a common practice in machinery design?  Can someone help me 
> understand what I am obviously missing?
>
> If it was me I'd stick it in the oven and see what happens.  If that 
> didn't seize it up, then I'd put it in the freezer and repeat the 
> experiment.
>
> 73 - Mark N5OT
> who thinks the best conductors are the ones standing in front of the 
> best orchestras

Empirical test is always useful.

Circumference and diameter grow by the same percentage (since C = d * 
pi), so CTE wise, it's the same whether you use diameter or circumference.








>
>
> On 10/3/2021 6:41 PM, Gedas wrote:
>> Thank you everyone. From the sounds of things I should be ok. 73
>>
>> Gedas, W8BYA EN70JT
>>
>> Gallery at http://w8bya.com (under repair)
>> Light travels faster than sound....
>> This is why some people appear bright until you hear them speak.
>>
>> On 10/3/2021 7:29 PM, Al Kozakiewicz wrote:
>>> Technically the circumference does. If I did the math right in my 
>>> head, that means the diameter changes faster than the coefficient. 
>>> If I'm wrong, it isn't the first time. Nor the last. If I'm right, 
>>> it isn't a very big deal with antenna sized tubing anyway.
>>>
>>> Al
>>> AB2ZY
>>>
>>> -----Original Message-----
>>> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Lux, 
>>> Jim
>>> Sent: Sunday, October 3, 2021 6:57 PM
>>> To: towertalk at contesting.com
>>> Subject: Re: [TowerTalk] Metal Thermal Rate of Expansion
>>>
>>> On 10/3/21 2:59 PM, Gedas wrote:
>>>> Thank you grant. I was not sure how to interpret that linear expansion
>>>> as my situation is using round tubing. Not sure if the diameter would
>>>> change at the same rate as in a linear strip of metal. 73
>>> Diameter grows at the same rate.
>>>
>>>
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