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Zero backlash with patented ball reducers

Zero backlash with patented ball reducers
Cyclo-style speed reducers aren't new per se, but by the same token they are not all the same. The latest products from Precision Motion (COFIL) take ball speed reducers to a new level, giving you a zero-backlash gearbox - but without gears.

Following on from the launch of Kamo Seiko's miniature indexing devices earlier in the year, Precision Motion (COFIL) has now brought the Japanese manufacturer's range of zero-backlash speed-reducers to the UK market. Available in both co-axial and right-angle configurations, these patented speed reducers differ from the more usual gearbox by utilising precision ground steel balls as the transmission medium. 

When compared with the more conventional planetary or cycloidal gearboxes, this somewhat different approach that uses eccentricity to generate reductions offers a number of benefits. There are no clearances, so of course there is zero-backlash, while preloading the balls ensures 100% mesh throughout the drive. And a characteristic of the rolling contact is reduced noise and long life. The design also assures high efficiency, and delivers high torque capacity. It also enables high precision repeatable positioning.

There is a huge choice of input/output options to suit all applications, including a version to allow direct fitting of NEMA 11 to 34 frame motors. In addition, the housing is designed to facilitate easy addition of custom made flanges for special applications. Reduction ratios are available from 5:1 to 1600:1, with rated output torque capacity ranging from 1.6Nm to 98Nm.

Heavy duty applications
Two of the products in the range are brand new: the CBR (cross ball reducer) which is an orthogonal shaft type design, and the BRE series which is a coaxial shaft type ball reducer for heavy duty applications. The reducers are supplied with input and output shafts, but a hollow input shaft can be substituted to accept step or servomotors. 

Referring to the collaboration between the two firms, Precision Motion Managing Director Stuart Smith says: "Although Kamo is very well established in Asia and the USA, the company was keen to develop a stronger European presence. With our background in fixed stroke cam-operated motion control and positioning solutions, the addition of this product range is perfectly synergous and helps us expand into the field of varying stroke servo-motor applications."
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