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Make my robot faster?

I am using a simple robot kit from parallax and everyone in my class wants to increase the wheel size, the amount of power supplied to the servos is constant, but I am having trouble seeing how this makes the robot that much quicker. It seems like the servos need to work harder with a larger wheel and yes it will be faster, but our servos can’t work any harder then they already are on the smaller wheels. I was just wondering if this is a true statement and if anyone had any other ideas to make our robot a little bit quicker.

Keep in mind the programming is sending max power to the servos, so we can’t do anything in that sense. I was hoping for some hardware tips.

If it’s true that the servos are the optimal design for the load and the wheel size, then changing the wheel size won’t help.

BUT, all designs are not optimal. It may well be that the servos have excess torque. In that case larger wheels may speed it up. Try resisting the motion with your hand, that may tell you something.

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Juan Pablo

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3 responses to “Make my robot faster?”

  1. the fist Avatar
    the fist

    why not make the wheels smaller (if in fact the larger wheels require more energy).
    References :
    just some dud, hope i can help

  2. Starrysky Avatar
    Starrysky

    http://www.nightrider.com/biketech/calc_formulas_page.htm

    Formulas for tire size & their effect

    effective ratio = (old tire diameter / new tire diameter) x original ratio

    actual mph = (new tire diameter / old tire diameter) x actual mph

    Formulas for g force & weight transfer

    drive wheel torque = flywheel torque x first gear x final drive x 0.85

    wheel thrust = drive wheel torque / rolling radius

    g = wheel thrust / weight

    weight transfer = weight x cg height / wheelbase x g

    lateral acceleration = 1.227 x radius / time^2

    lateral weight transfer = weight x cg height / wheel track x g

    centrifugal force = weight x g
    References :

  3. billrussell42 Avatar
    billrussell42

    If it’s true that the servos are the optimal design for the load and the wheel size, then changing the wheel size won’t help.

    BUT, all designs are not optimal. It may well be that the servos have excess torque. In that case larger wheels may speed it up. Try resisting the motion with your hand, that may tell you something.

    .
    References :

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