Re: Semi-Scale Wheelsets for IMRC 70-Ton Trucks


Kurt Laughlin <fleeta@...>
 

Not to mention that each conical hole has its own axial center, and the presumption in the whole scenario is that the the opposing axial centers are perfectly coincident, perfectly parallel to the adjacent axle's centerline, and located properly relative to the kingpin axis. Or, if not perfect, at least significantly closer than the error caused/tolerated by a .005 increment in axle length. Otherwise there'd be no point in the exercise in the first place.

KL

----- Original Message -----
From: Denny Anspach

Measuring the inside diameter between the points of the conical
bearing holes is an effort that is better in the thinking than in the
doing. The thinking presumes that the bearing holes actually have
conical points, and that such an accurate measurement between them
would then accurately predict what the ideal axle length would likely
be. It doesn't quite work out this way inasmuch as the truck bearing
"cones" are never perfect, and in fact are commonly either actually
flat, of flattened curvature, quite assymetric, or any combination of
the three. So quite (most!) often, an axle whose length theoretically
seems to be ideally fitted in any given instance, while in real time
it does not roll worth a hoot.

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