SDP/SI provides a wide selection of ratios in both BuOrd (U.S. Bureau of Ordnance) and NEMA size gearheads and speed reducers to fit your application. We manufacture our gearheads and speed reducers to the highest exacting standards of craftsmanship.
The gearheads are attachable to BuOrd frame size servomotors without modifications to the input pinions and without complicated adapters. They are designed to be used in high-accuracy electromechanical systems. All gears are precision cut. The output gear and all stage pinions are made of hardened 416 Stainless Steel. Housings are black-anodized aluminum alloy and are precision bored for exacting center distances. The cantilever design combined with wide bearing span results in extremely low backlash.
Planetary gear and gearhead speed reducers that provide a high degree of position accuracy are also available. Our precision and economy planetary gearheads feature ratios from 3:1 to 700:1, standard NEMA sizes 17, 23, 34, and 42, inline, right angle and dual output styles. Spur gearheads, a low cost alternative to planetary gearheads are available in ratios from 3:1 to 100:1. If a standard unit design does not meet your expectations we can provide a custom design.
http://www.sdp-si.com/web/images/Plane-tary_Gear_White_Paper.pdf