| Re: [GMCnet] Mech. Engineer Q. [message #106548] |
Tue, 23 November 2010 12:44  |
Gary Casey
Messages: 448
Registered: September 2009
Karma:
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Senior Member |
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I'm not so sure that the method discussed will accomplish the task. The
question is about the objective. I have assumed that the "best" balance is to
have equal loading on the two front wheels and take up whatever side-to-side
load differences there are with the rears. Right? What else would be better?
I'm not sure. If you initially support the rears by a single point in the
middle you will end up adjusting the fronts to absorb all side-to-side
unbalance. Frankly, I don't know of any way to make sure the fronts are equally
loaded except to use a scale. Is it important to have the fronts equally
loaded? More questions than answers.
Gary Casey
This is rather interesting. A simple beam doesn't care if it's upside-down,
except for the effect of the weight of the beam itself, which in this case
is pretty negligible.
But I would suspect that stiffness is a more important parameter than
strength. I might be tempted to design for deflection rather than allowable
loads.
So, your concept of operation is to jack up the coach, slide the fixture
under the rear bogies, align hooks in the fixture to the openings in the
bogie frames (which would serve to prevent slippage and also to ensure
centering), and lower the coach onto the fixture.
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