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Re: [TowerTalk] Metal Thermal Rate of Expansion

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Metal Thermal Rate of Expansion
From: "Lux, Jim" <jim@luxfamily.com>
Date: Mon, 4 Oct 2021 08:00:44 -0700
List-post: <mailto:towertalk@contesting.com>
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@contesting.com> On Behalf Of Lux, Jim
Sent: Sunday, October 3, 2021 6:57 PM
To: towertalk@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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