Posted by Janicholson on February 01, 2010 at 07:09:24 from (199.17.6.233):
In Reply to: Re: NF wedge-plate posted by RustyFarmall on January 30, 2010 at 13:51:13:
Well rusty I rarely disagree with you, but you are thinking of the same thing, but not looking at the geometry. Both are a result of having the steering axis lead the contact patch. Casters on a shopping cart go nuts becausw they are worn out and loose. Any one of the degrees of freedom will allow them to get into a self feeding vibration. The pivot on a shopping cart is in front of the contact patch. In a car (or cycle) the ball joints (or strut) are tipped to the rear to force the contact patch to follow where the axis of the steering projects to the ground. A narrow front is far more like a shopping cart (doing the wobble thing) than a car or cycle. Increasing the caster by wedge action is in the same direction as having a caster wheel on a shopping cart with a 4" offset to the rear of the axis. If they put that much offset (caster) in the shopping cart, they would not go nuts. But they would be more easily broken, and take up more space under the cart. JimN
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