- #1

mselak500

- 9

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Does the ratio between gears have to equal the ratio between pitch diameters?

This is our first application where the diameters of the cylinders are different. For our application, we need to be able to adjust the space between the cylinders, so we typically subtract .010 from the pitch diameter. Since the pitch diameters are the same, the ratio between the pitch diameters will equal the gear ratio. But when I follow this for cylinders with different diameters, the ratios are no longer the same.

Here is some other information:

Helical Gears

Ratio between the cylinders - 1.200 (22.776 & 27.3312)

Pressure Angle - 20 deg.

Normal diametrical pitch - 8

Thanks,