View source for Gears Buyers Guide

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* [https://en.wikipedia.org/wiki/Gear#General_nomenclature '''Gears'''], whether of the same size or different diameters, will only '''Mesh''' together if the size of the teeth are the same.

* The size of Gear Teeth is measured along the circumference of an imaginery '''[[Gear Nomenclature|Pitch Circle]]''' but is more easily calculated by dividing the diameter of the '''[[Gear Nomenclature|Pitch Circle]]''' by the number of gear teeth.

* The Gear Teeth size is known as the '''[[Gear Nomenclature|Modulus]]''' or '''[[Gear Nomenclature|Module]]''' '''''(m)''''' and it must be the same for any meshing gears.

* Always check this before purchase - contact supplier if not stated. 
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