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Elliptical Gears Now Available From A Standard Range .

01 August 2000

Elliptical gears now available from a standard range

One way of obtaining a cyclical speed or phase variation between two or
more connecting shafts - such as may be required in packaging, textile
manufacturing and other specialised automatic assembly machines -is to
use elliptical gears. Hitherto, these have only been made to order
because they are not the easiest things to make when precision tolerances
are needed. Now, thanks to a distribution deal struck between the UK
based Precision Motion (Cofil) and Italian company Nanni Ingrannagi, a
standard range of these components is now available.

The transmission radius of an elliptical gear is the maximum radius
divided by the minimum radius. If this were, say, 2:1, then the resulting
speed variation would be 4:1 during one cycle. If the drive shaft rotates
at a constant one revolution per second (rps), then the driven shaft
speed will vary between a minimum rate of 1/2rps to a maximum rate of
2rps. However, in one second both drive and driven shafts will have
accomplished one revolution.

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