The materials difference in thermal expansion is 1.7e-6 per degree C.
So 2" x 1.7e-6 x 100d C temperature range = 0.00034"
You will never notice at any place on earth.
Grant KZ1W
On 10/3/2021 11:45, Gedas wrote:
It is has been WAY too many decades since my last ME classes to be
confident in my estimations so I am wondering if someone can give me
their opinion if I am going to run into trouble.
The YT video (URL below) shows a new 10 GHz elevation mount I am making.
For a bearing I chose to use 6061-T6, ~2" OD tubing rotating inside a 2"
ID brass collar. I had to turn down the aluminum tubing a bit to fit
nicely inside the brass collar which now allows it to turn freely w/o
slop but this is at room temperature.
My fear is that on a very cold day or a very hot day my home made
bearing may seize up on me.
Can someone run a quick calculation? I see that my aluminum and brass
have 13.0 and 11.3 (for yellow brass which is a WAG for what I have). I
am leaving off the units and exponents etc.
https://www.engineeringtoolbox.com/thermal-expansion-metals-d_859.html
Here is the URL that shows the homemade bearing:
https://www.youtube.com/watch?v=Ps_PRXaByz4
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.
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