[AT] List quiet!! Everyone OK, or just waterlogged??? --> Lug bolts, JD A

[Stephen Offiler]

Yep.  The washer example is a great way to explain how thermal expansion
works on holes.

SO


On Wed, Jul 3, 2019 at 3:31 PM <szabelski at wildblue.net> wrote:

> No. Thermal expansion is constant.
>
>  Consider a flat washer. If you heat it, it will expand on the outside and
> get larger because the molecules are separating due to the heat. The outer
> circumference is now bigger.
>
> Likewise, the inside expands due to the heat and the internal
> circumference becomes bigger by the same ratio.
>
> Think of what happens to the outer edge. The outer edge gets longer so the
> diameter becomes bigger because it remains circular. Now apply the same
> thought to the inner edge. It gets also gets longer, so again the diameter
> becomes bigger because it remains circular.
>
> The washer also gets thicker due to the heat.
>
> Have you ever seen someone replace the lower pulley on a Farmall Cub? You
> really have to put a lot of pulling force to get it off of the crankshaft.
> In order to get it back on, you have to heat the pulley to somewhere near
> 300 degrees and press it onto the crankshaft. That’s why the crankshaft is
> threaded on the end so you can use a 3/4 inch bolt and washers (or some
> other spacer) to press it on.You have to make sure both pulleys line up
> properly, so you need to get it right while the pulley is hot enough. When
> the pulley cools you can’t just tap it back and forth to line them up, it’s
> on there good.
>
> There are also cases where bearings have to be heated in order to get them
> onto a shaft.
>
> ----- Original Message ----
> From: Mike M <meulenms at gmx.com>
> To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
> Sent: Tue, 02 Jul 2019 12:29:37 -0400 (EDT)
> Subject: Re: [AT] List quiet!! Everyone OK, or just waterlogged??? --> Lug
> bolts, JD A
>
> Wouldn't heating the "hole" cause the steel to expand making it smaller?
>
> Just curious.
>
> Mike M
>
> On 7/1/2019 9:10 PM, szabelski at wildblue.net wrote:
> > When applying heat you want to heat the item the bolt in threaded into,
> not the bolt.
>
>
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