The Bug series of linear actuators from Ultra Motion feature ABEC-7 angular contact bearings and interchangeable motor mounting plates. A Kevlar drive belt and pulleys provides 1:1, 2:1, 3:1, 4:1 and 5:1 drive ratios with low backlash and low audible noise by eliminating gears between the motor and the drive screw. There are 17 motor options including: dc, dc servo, dc gearmotors, steppers, and Animatic "Smart Motors." Absolute position feedback is available so that position is remembered even if power is lost.
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