To: | Thomas Noel <tnoel@mac.com>, charlie@thegallos.com |
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Subject: | Re: [TowerTalk] Which Thrust Bearing to Use |
From: | Grant Saviers <grants2@pacbell.net> |
Date: | Fri, 9 Dec 2016 20:10:52 -0800 |
List-post: | <towertalk@contesting.com">mailto:towertalk@contesting.com> |
Sure. But since most machining isn't done at -40 deg C, the hole does
get smaller when the temperature is lower than when the hole was bored.
I think my calc was correct from a 65 deg F machining temperature. And
the CTE of steel is 20 times less than UHMW so it doesn't matter much in
the tolerances.
On 12/9/2016 18:45 PM, Thomas Noel wrote: Absolutely. The circumferential expansion far exceeds the tiny inward radial expansion. Thomas W Noel KF7RSFOn Dec 9, 2016, at 6:23 PM, charlie@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 AD3FI 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 _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk_______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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