Re: Scale Weights - Doubt It

Paul Hillman

This is the same thing that the prototype has had to deal with. Now we're getting down to the "nitty-gritty" of the TRUE prototyping of our model railroad cars,..... theory of parts & materials in action. Total dynamics!

Weren't archbar trucks downgraded, and friction-journals, etc., for similar reasons, et al?

What causes prototype "hot-boxes"? They'd figure it out, then change the materials & methods!! These things were all caused by loadings, empty or loaded. The same as in our models.

Long Live Model-Railroading!!

Paul Hillman

----- Original Message -----
From: Tim O'Connor<mailto:timboconnor@...>
To: STMFC@...<mailto:STMFC@...>
Sent: Saturday, August 20, 2005 8:25 PM
Subject: [STMFC] Re: Scale Weights - Doubt It

NMRA guidelines notwithstanding, I have run cars of various
weights on several layouts and my experiences vary from car
to car. Some light cars run fine, some don't. Same for heavy
cars. The heavier the car, the more force on the "journal"
of the axle -- I have seen many plastic needlepoint axles
literally worn down to a nub because of excess car weight.
An HO sprung truck's sideframes will bow outwards under too
much weight, changing the position of the axle end in the
sideframe bearing and greatly increasing friction and wear.
None of this has anything to do with prototype axle loads.

Tim O'Connor

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