RATTLE Peak-to-peak rattle measurement made easy.
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RATTLE Description

In his book, "Home Machinist's Bedside Reader #1", Guy Lautard describes a technique for measuring a large bore when you don't have a set of calipers large enough to span the diameter. Basically, you cut a "stick" to a length slightly less than the diameter of the bore and provide it with rounded or pointed ends. Inserted in the bore, this stick will "rattle" back and forth a (hopefully small) amount. You measure the peak-to-peak rattle and then use a formula to calculate the actual diameter. Lautard gives a formula but it looks like an approximation. If the rattle distance is small compared to the diameter of the bore, the stick length itself is a very accurate approximation of the bore diameter. RATTLE is a simple, command based application designed to accurately compute the diameter given the stick and rattle lengths in order to evaluate this procedure. You can use it to calculate the diameter if you need to use this procedure.

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