Thursday, May 7, 2009

Using Knowledge to Sell Bearing and Seals

There is a retired gentleman in our town that was locally famous for being able to find and sell parts that nobody else could find. His strength was in bearings and seals. The bearings and seals came off of no telling what and nobody was going to find the application in any catalog. He used a micrometer to measure the old bearings or seals and then looked up the bearing or seal by size in old paper catalogs. These are his instructions. We start with ball bearings. You will need to measure the inside diameter, the outside diameter and the width. The inside and outside diameter measurements need to be accurate to within .001". In most cases the width can vary some but not always. The seal is measured the same way. With seals if you are measuring an old seal you must allow for wear. On the inside the old seal may measure less than the new one. On the outside diameter the old seal may measure as much as .005" smaller than the new seal. That is because there is a press of .005". In other words, the new seal is .005" bigger than the hole it is going in. For taper bearings you must also measure the radius, that is, the taper of the inside of the bearing.

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