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Suzuki MX & Off-Road Dirt Bikes
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[QUOTE="Bunya, post: 1211962, member: 77196"] Fox, technically it's a 'drive fit' and it's suprising how strong it is. The gear gets heated to expand it and the shaft is cooled to shrink it. The cooling is usually done with liquid nitrogen which is -321 °F. The rate of expansion for steel is approx. 6 millionths of an inch per inch per degree F (Aluminum is approx. 13 millionths). If the shaft is 1" at 70°F, it will shrink 0.000006" x 391 degrees x 1", or about 0.002346". Add to that another .001" expansion achieved by heating the gear and you end up with close to .0035" additional clearance between the parts. This allows the shaft OD to be .003" larger than the ID of the gear when the temperatures equalize, yet are easily assembled without damaging or distorting the parts. A .002" interference fit is in the range for a FN2 drive fit which is sufficient for the torque loads expected provided there isn't high lateral loading present. The reason they used it is simple - it's cheap! The only machining required is the shaft turned to size and the gear bored to size. Splines and even simple keys are much more expensive to machine because they require additional operations. The biggest part of an engineer's job isn't making something work, it's figuring out how to make it as cheaply as possible while maintaining the quality standards set by management. [/QUOTE]
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Suzuki MX & Off-Road Dirt Bikes
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