Thread: Gear Pressure Angle and Pitch.
View Single Post
  #9   Spotlight this post!  
Unread 12-08-2002, 16:31
Paul Copioli's Avatar Unsung FIRST Hero Woodie Flowers Award
Paul Copioli Paul Copioli is offline
President, VEX Robotics, Inc.
FRC #3310 (Black Hawk Robotics)
Team Role: Engineer
  
Join Date: Jun 2001
Rookie Year: 2000
Location: Rockwall, TX
Posts: 1,388
Paul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond repute
CCT uses Worm Gear
The CCT (check out the White Papers) uses a worm gear setup. It is very packaging efficient (lots of gear ratio in 1 stage), but horribly inefficient when it comes to torque transfer. Our worm stage had an efficiency of 70%. I would not recommend a worm gear stage for a drive train, but for a robot arm: absolutely! The worm gear has one really big advantage: It can be non-back driveable if designed right. The non-backdrive feature is a direct result of the inefficiency.

When the Van Door Motors were in the kit, I know some teams who used those for drive motors. You didn't need much gear reduction because they were already geared down. By the way, those use a worm gear.

-Paul