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  1. 02-01-2011 #11
    mmcp42's Avatar
    Lives in London, United Kingdom.
    mmcp42
    Last Activity: 27-10-2012 Has been a member for 9-10 years. Has a total post count of 23.
    Quote Originally Posted by Jonathan View Post
    Ahh just realised. My method can easily be extended to the general case for n bolts. You just need to know half the angle interior angle of the particular polygon. Then do cosine of that to get the factor...

    3 = Triangle, 60/2 = 30, so cos(30)
    4 = Square, 90/2 = 45, so cos(45)
    5 = pentagon, 108/2 = 54, so cos(54) = 0.5878 (!)
    6 = hexagon, 120/2 = 60, so cos(60) = 0.5

    The formula to find the interior angle is 180(n-2)/n.
    So that means, given n bolts with spacing x.

    r=cos(90(n-2)/n)
    PCD = 2*cos(90(n-2)/n)

    enjoy!
    my question is - none of these formulae use x - I'm sure they should somewhere?!?

    r= x/(cos(90(n-2)/n))
    PCD = x/(2*cos(90(n-2)/n))
    Last edited by mmcp42; 02-01-2011 at 04:03 PM. Reason: more correcter formula (mebbe??)
    there are 10 sorts of people in the world
    them as understand binary
    and thems as doesn't
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