Torque on Parallax Servos

Comments

• Mike Green Posts: 23,101

  2007-07-24 20:51 edited 2007-07-24 20:51

  BipedPete,
  That's like asking if someone could carry enough water for a family to use. You'd start asking "for what?" "how often?" "how far?" "how big a family?" "in a bucket?" "how strong a someone?" "in a tanker truck?" ...
  
  Sketch out a design. Figure out where the forces would have to be applied. Would the servos be expected to "be" the joints themselves or simply provide the turning force? What kind of materials are you talking about? How heavy would this be?
  
  I can imagine one biped design where these servos might work fine and another design where they'd be terribly underpowered. There's also a big difference between a 2 ft. design and a 4 ft. design.
• BipedPete Posts: 8

  2007-07-24 20:52 edited 2007-07-24 20:52

  Thanks for that answer.
• bulkhead Posts: 405

  2007-07-25 03:38 edited 2007-07-25 03:38

  Standard servos have usually around 50 oz*in of torque. This means it could lift a 50 oz weight with a 1 inch am, or a 1 oz weight with a 50 inch arm, or anything in between. You can also consider using springs and other mechanical devices to assist in moving a load/conserving energy during motion.
• BipedPete Posts: 8

  2007-07-25 20:56 edited 2007-07-25 20:56

  Thanks for that Bulkhead
• Dave Hein Posts: 6,347

  2007-07-26 19:17 edited 2007-07-26 19:17

  Check out the Futaba servo page. They have some servos that are specifically intended for robotic use. One of the robotic servos has a torque of 192 oz-in (1 foot-pound). They also have a "Heavy-Duty High-Torque" servo with a torque of 340 oz-in (1.77 foot-pounds) at 6 volts.
  
  Dave
• BipedPete Posts: 8

  2007-08-10 18:11 edited 2007-08-10 18:11

  The point is to make the robot from parallax servos to see if it can be done.
• Franklin Posts: 4,747

  2007-08-10 20:38 edited 2007-08-10 20:38

  Then I'd go for it and modify your design so the servos are not used outside their specs. (use gears or levers to accomplish the movements)
  
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  - Stephen
• Bruce Bates Posts: 3,045

  2007-08-10 21:26 edited 2007-08-10 21:26

  Pete -
  
  If you do get involved with gears or levers on servos, there is an excellent selection here of all sorts of auxilliary equipment at Servo City:
  http://www.servocity.com/
  
  Regards,
  
  Bruce Bates
  
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• walice_drel Posts: 81

  2007-08-15 13:41 edited 2007-08-15 13:41

  The paralax servos are to underpowered it would have to be less than 10 servos because any more weight and the legs wont work. Also 2-4 foot tall should be more like 18 inches tall for balance and less weight.
  
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