Variable speed and automatic reversal
This platform runs on a rolling ring drive and reciprocates automatically without motor reversal. Linear speed can be adjusted on the fly with a control knob on the assembly, without changing speed or reducing gears. No electronics or programming is needed - speed and travel direction are controlled mechanically. The platform is low maintenance, with no hydraulics or pneumatics, and only a light shaft lubrication once every three months in the linear drive. Adjustable end stops can increase or decrease length of travel. Precision-machined components limit vertical and horizontal platform movement to within ± 0.001 inches, and rolling ring bearings compressed against the shaft inside the drive make for zero play and backlash-free motion. A modified reversal mechanism makes for smooth, jarring and jerking-free reversal.