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I found this image of a robot on the web, and I can't find an email address for the person who built it. I was hoping someone on this site could try to explain why the builder would choose to use those belts on top to steer the wheels rather than just drive them directly with a servo mounted on top of the platform? Is there an obvious advantage to this configuration? The website lists them as "timing" belts. What is their purpose?
What's more, why did he use two servos for the front and two servos for the back instead of using a front belt that goes all the way to both wheels with a single servo in the middle, and the same setup in the back? Did his servos not have enough torque to turn both wheels?The only solutions I can think of are: (1) he wanted to do what I said above and discovered that his servos weren't up to spec or (2) he thought belts would look cool.
use of 2 servos instead of 1 for front and back[...]- reduces hight (belts would have to be on top of each other)
Hi,Quote from: blackbeard on October 22, 2010, 07:10:27 PMuse of 2 servos instead of 1 for front and back[...]- reduces hight (belts would have to be on top of each other)Well, no. If the idea was to run from a single drive wheel, a single belt would be quite enough.But then you'd have much more wheel friction and instability when turning.
Quote from: Soeren on October 22, 2010, 07:26:10 PMHi,Quote from: blackbeard on October 22, 2010, 07:10:27 PMuse of 2 servos instead of 1 for front and back[...]- reduces hight (belts would have to be on top of each other)Well, no. If the idea was to run from a single drive wheel, a single belt would be quite enough.But then you'd have much more wheel friction and instability when turning.not really. you'd need some sort of wrack and pinion or something to give it car like steering.
this would be more complicated and i believe the poster was concerned at how complex it was to begin with.
you could have it steer like a kid's wagon but that would be opening up a whole other can of worms
and would make it virtually impossible to control accurately with all the torque on the servo.