Quote:
Originally Posted by crakarjax
Should be some basic geometry if you know the distance between the upper and lower balljoints, and the current angle.
Assuming 9" between ball joints and a currently vertical spindle,
3.14 * (4.5^2) = 64 (radius of a circle)
360 * (64 * .25) = 1.4 degrees (360 degrees in a circle times the fraction of the circle that is 1/4")
So 1" should net about 5.6*, 3/4" would be around 4.2* gain
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Looks like you calculated the area of a 9" circle. I'd do the calculation by 'assuming' that we're swinging the lower ball joint forward around the circumference of a 9" circle with center at the (fixed) upper ball joint.
Circumference of a 9" circle would be: 3.14 * diameter = 28.26"
degrees per inch moved (around that circle) would be 360 / 28.26 = 12.7
This ignores the cosine error, of course, making my calculations a little larger than we'd actually get. So, compared to a vertical spindle...
moving 1.0" equals 12.7 degrees caster
moving .75" equals 9.5 degrees
moving .5" equals 6.35, etc....