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Re: Re: Side gurder bolts snapped....Help!

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RH

04-18-2001 03:48:05




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Bill said "The intense heat of the weld tends to shrink the bolt...". I'm splitting hairs now but that is not correct. Actually the heat makes the bolt expand, not shrink. I think it is called the thermal expansion or something. The reason why the bolt is loosening is that the hole, where the bolt is, expands more than the bolt does. They attach train wheels to the axle by this method: they heat the wheel and when the hole gets bigger they put the axle in and let it cool down (the diameter of the axle is bigger than the hole when not heated).

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Bill

04-18-2001 05:03:24




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 Re: Re: Re: Side gurder bolts snapped....Help! in reply to RH, 04-18-2001 03:48:05  
I 100% agree that heating expands metal but it's after cooling I refer to. It is possible to straighten a shaft or beam by heating areas on the stretched side then letting it cool thoroughly. I have straightened 5" dia stainless steel propeller shafts this way. Works on smaller sizes too. This is using no outside force of a press or such. You musk realize how well a bead of weld inside of a difficult bearing race releases it from the bore. The weld bead is pulling the race in as is metal adjacent to the weld that reached extreme temps as the hub never achieved this high temp. I hope I've explained my self clearly and I still agree with your analogy on the train wheels. It's just that you can expand or shrink with heat when desired. Maybe someone else can reword this to be more effective. Thank you, Bill

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RH

04-19-2001 03:30:25




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 Re: Re: Re: Re: Side gurder bolts snapped....Help! in reply to Bill, 04-18-2001 05:03:24  
Clearly you are aware of the thermal expansion. Your earlier message gave me the impression that you think that the heating shrinks the bolt. I didn't understand it right, sorry.



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