Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: zizou244 on June 09, 2015, 03:40:07 PM
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Hello Guys !
I'm currently building a 4 wheeled car and I'm trying out a differential drive with the Two Rear wheels connected to DC motors, and two Free rotating front wheels.
I'm curious what kind of simple mechanism I could use to get the "free rotation" part. I only know about the bearing system you can find in this kind of wheel :
(https://scontent-mad1-1.xx.fbcdn.net/hphotos-xfa1/v/t1.0-9/11403316_10207071267570848_4413486171192212580_n.jpg?oh=ad69f7b2e71a92e51cb861856aa931ef&oe=55FFEBF1)
The wheel you can see in the picture has some kind of ball bearing.
Do you know of any other "simpler" way of ensuring the free rotation around the Z axis ?
PS : The car i'm building is a little big, and the wheels I'm using came from an old baby stroller (15 cm diameter and a 1cm hole in the middle)
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;D Hello!
In reference to your wheels selection, I would check out some of the vendors in this forum;
like ServoCity. Some of these vendors have some mind-blowing wheels, :o that turn
in an unconventional way; and they are priced reasonably. Check them out! 8)
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It's also very common to put some low friction piece of material as a third point of contact. Something like a bottle cap would even work.
If you want something a little nicer, you could get a ball caster. It is essentially a marble in a holder that can roll in any direction. They're relatively inexpensive on Sparkfun.