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Unread 30-10-2011, 13:44
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Re: High Tensile Sprocket Bolts

Quote:
Originally Posted by Trent B View Post
Wouldn't the hex holes in the plaction wheel help absorb some of the shear force over a circular spacer that was barely unable to fit in the hex holes?
Not really. Technically yes if the tips of the hex extended further from the centerline of the fastener than a round spacer (which wouldn't extend to the 'points'), but that would be very little help.

It has to do with lever arms and resistance to bending. A very thin spacer would be able to more easily move/tilt due to the torque of the wheel (that is, in the shear direction). A wide spacer (or the neat device Joe Ross linked to - thanks Joe!) wouldn't tilt as much (or at all).

Shear over a wide area is bending. Think of a bolt sticking out an inch, force on the end of that bolt will bend the bolt. Apply that same force at 1/16" from the supporting structure and it won't bend as much. That's why someone said that adding spacers to put the sprocket further out from the wheel makes things worse.
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