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  • Spur versus planetary gearheads for dc servomotors
    . Torque capacity of spur types is limited because each gear in the train bears the entire torsional load. Planetary gearheads, in contrast, share the load over multiple planet gears. Here, the input shaft drives a central sun gear which, in turn, drives the planet gears. Each of the planet gears
  • Gearhead Construction and Use
    Gearhead Construction and Use. Spur Gear Type Gearheads. Direction of Rotation. Planetary Gears. Spur Gear Type Gearheads. Spur gear type gearheads are probably the best possible choice for relatively low torque applications. They tend to be less expensive than comparably sized planetary gearheads
  • No more "girlie man " gears
    . Fatigue strength curves generated by the P-Gear unit are measured on standard 2-in. test gears. The data shown was taken using gears made from Celcon M15HP acetal copolymer, a high-performance gear material. Plastic gears have had a successful run in automobiles, appliances, office equipment, and power
  • Sometimes it pays to be eccentric
    There's more than one way to get high positional accuracy, minimal backlash, and high reduction rations in small packages. An unassembled harmonic-drive gear from HD Systems Inc., Hauppauge, N.Y., shows the three main components. The reducer includes a wave generator, far left, which engages
  • Planetary reducers eliminate machining step to keep costs down
    with three planet gears. Such configurations tend to last longer than parallel-shaft spur geartrains and better handle larger continuous and peak torque. Tough involute gears are pressed net shape from a sinter-hardened, powder metal which eliminates secondary machining and the associated cost. Another

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