Change Factor
The preferred method will be stated on the drawing and the relative dimensions given, for our two examples:-
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Change Factor
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| Throughout many of the calculation examples found on this site, you will see reference to a Change Factor and judging by the amount of enquiries I receive, a lot of people are ignorant of this very useful little feature. | ||
| The
tooth size can be measured by a number of means such as: a)
Base tangent (span size) and b)
Measurement with pins. The preferred method will be stated on the drawing and the relative dimensions given, for our two examples:- |
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| Base tangent: the base tangent dimension Wk is given and the number of teeth k over which the dimension spans. | ||
| Pin method: the diameter of two pins Dm is given and a dimension over/between these pins Mdk | ||
| You will of course require a span micrometer capable of spanning the dimension Wk for the base tangent method and for the pin method two pins of the stated diameter Dm and a micrometer capable of measuring the dimension Mdk | ||
| If none of these tools are available all is not lost thanks to the Change Factor. This allows any method of tooth thickness measurement to be converted to a Circular Tooth Thickness. In other words if a customer states on a drawing a tooth measurement method that the manufacturer is unable to measure, then the appropriate change factor may be used to convert (change) it to a method that can be checked. | ||
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