Posted by rustyfarmall on February 02, 2010 at 07:51:50 from (209.152.78.140):
In Reply to: NF wedge-plate posted by Janicholson on January 30, 2010 at 11:10:23:
Red Mist said: (quoted from post at 08:17:59 02/02/10)
rustyfarmall said:
Mike, you and I are in total agreement on this issue. That wedge has GOT to be installed with the narrow edge toward the front to produce "POSITIVE" caster.
It seems that way initially, Rusty, but I am not so sure about that. Look at those two diagrams again in the article you attached. See the vertical dotted lines showing the axis center vs. the contact area? They are the same in both examples as far as their relationship to each other...... I'm not ruling Jim's position out; just that it's hard for me to envision the shopping cart front wheel having positive caster. But, I think he's right - darn it!
Maybe the wedges were designed NOT to stabilize steering, but to ease steering effort on tractors without power steering. mike[/quote]
O.K. My knowledge of automotive front end alignment, and the difference between positive caster and negative caster, was gained from attending the auto mechanics course taught at Southwestern community college, Creston, Iowa, in the year 1971. We learned, and were tested on all aspects of auto repair, including front end alignment. I still have my text books.
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