Subject:
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Re: caster wheel design
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 30 Mar 2005 14:55:33 GMT
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Viewed:
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825 times
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In lugnet.robotics, Patrick Levy wrote:
> If I use an axle or pin for the caster, it will
> bend. (the robot is quite heavy).
How heavy is this? A caster needs an offset, but making this offset as small
as possible should reduce bending. I usually use a medium pulley on a #3 axle;
either end of the axle is held in the pin hole of a Technic crossblack, while
short (#4?) axles in the axle holes of the crossblocks run up & into a pair of
1x3 lift-arms (the half-width type with axle holes at either end). The central
pin hole of these two 1x3 liftarms can then serve as the rotation point.
> So i tried to use a turntable as a caster axle,
> but for some reason, it also did not work (the
> caster does not turn somootly.).
If you use a small turntable (2x2), with the caster wheel very slightly
offset, perhaps. But with the large turntable, you're likely trying to use a
large offset - this makes sense, as it would produce a lot of torque to try to
pivot the caster. But it will also tend to bind up one side of the turntable,
which may be your problem.
--
Brian Davis
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Message has 1 Reply:
 | | Re: caster wheel design
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| If you are planning on running on smooth surfaces, you might be suprised at how well your robot drives and turns with just one of those domed 2x2 'gliders' instead of a wheeled caster. ---...--- Steve Baker ---...--- HomeEmail: (...) (19 years ago, 30-Mar-05, to lugnet.robotics)
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Message is in Reply To:
| | caster wheel design
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| Hi, I´m tring to build a robot that may use a caster wheel, But i am running some serious problemes in it design. If I use an axle or pin for the caster, it will bend. (the robot is quite heavy). So i tried to use a turntable as a caster axle, but (...) (19 years ago, 30-Mar-05, to lugnet.robotics)
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