Originally Posted by
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OK, lemme get this straight:
1.) A ring, when cooled will shrink in onto itself, making the inside diameter larger, so it will slide more easily onto a shaft of given outside diameter.
2.) A sprocket is a ring.
3.) Nevertheless, heating the sprocket works best, in spite of what item 1 says.
Seems to me, upon chilling, the ring (or anything but water, which expands on freezing, unlike 'most everything else in the world) would contract in onto itself, so its inside diameter would be larger, and its outside diameter would be smaller. The constituent molecules are clueless as to inside, outside, up or down: They just contract into a smaller space. This is essentially what Tom and Ray (the Tappet Bros. on Sat. morning NPR's "Car Talk" show) say. Tom or Ray has a master's degree in physics from MIT and they run a car fixit shop, so they seem like a creditable source.
As this is an extremely handy thing to know, can somebody please micrometer-measure a sprocket, ring (or whatever) at room temp, at heated temp, and at freezing temp, and tell us all the difference(s)?
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If you check you'll see that both click and clack had degrees from
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