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MX | Off-Road Gear Info & Reviews
New rear sprocket???
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[QUOTE="Jaybird, post: 760210, member: 22283"] OK...Scot I want to admit a lie...well not really a lie, per se, but a misnomer. To my limited metalurgical knowledge, the elasticity of the side plates more than likely remains quite constant. I think that when we place a tensile force against the chain that the plates will return to their normal length, providing that they haven't been forced past their yield point. My research leads me to believe that this modulas of elasticity remains constant for all steels. I have a hard time believing that it wouldn't be different for different steels, but those smarter than I, seem to claim it so. My "lie" is telling folks that the chain stretches initially to a longer point and stays there, even though I know(or think) than not to be really true. It just sems easier for folks to grasp without going into detail on the real deal. Like I tell my kids, no matter what you say that isn't quite true, there will always be at least one person who will find you out. (I have a sneaking suspision that Eric and Rich understand where I'm coming from on this issue) :) What I do think is that when we place a tensile force on the chain, that the working faces of the chain undergo a very slight "tightening up". This would be due to compression of the oxide layer that is present in all metals to varying degrees. Hardening of the surface? I, like you, doubt that. But consider the surface of a fresh piece of carbon steel from the mill...the oxide scale can literaly be flaked off with your hand. Help me on this...would it make a difference to the Brinnel ball testing a fresh piece of metal that obviously has scale, and the same piece that has been prepared with a buff from a grinder? What I have seen in industrial size chains, both roller and rivetless forged chain, is that there is indeed a "shining up" period that the chain immediately undergoes within the first few hours of run. Granted, on forged and cast parts, this immediate change in length is more due to actual removal of very jagged asperities on the mating surfaces. But I have also seen this intitial growth take place on large size roller chain but to a much lesser degree. I think that quality chains that have had the parts shot peened have these jagged craters, or asperities, removed during this process. Due to this alone, the growth of a chain during the initial few hours of run has to be minimal. Probably so minute, on a quality motorcycle chain, that it can be ignored, since our chain drives can tolerate a good deal of tolerence in tension; especially tolerance in the "longer" direction. On the cracking rollers...would you contribute this to the parts being too hard? Perhaps exceeding the desired hardness during the hardning process, since a different batch of steel can vary? More of a QC issue than anything else? Man, Scott...you are in a position to know lightyears more than me on this subject, and I am jealous. I only get to pick metalurgists brains on occasion. [/QUOTE]
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MX | Off-Road Gear Info & Reviews
New rear sprocket???
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