Subject:
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Re: Toy Story Train comments?
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 3 Jun 2010 10:26:45 GMT
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In lugnet.trains, David Laswell wrote:
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In lugnet.trains, John Neal wrote:
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That’s good to know. I haven’t gotten one yet, and would like to run it as
unaltered as possible.
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I built a coal car over a 9v motor, and tried it out on a circle of track.
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Most folk call this a “tender”, since it carries water as well (and often, fuel
oil rather than coal if the engine is an oil burner)
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It had serious problems running while pushing the engine in front of the
motor. I tried adding some straights in to make an oval so it’d have a
couple stretches without curves to maybe build up a bit of speed, and it
didn’t improve things very much. Eventually I figured out that what was
happening was that the motor wheels were slipping, so I popped open the coal
car and stuck a weight brick in the hollow cavity. Works fine now.
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If weight helps you may have some binding in the driver mechanism somewhere.
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I should point out that I made a few tweaks to the design. Instead of using
non-friction axle-pins to hold the main driver wheels on, I’ve replaced them
with red 6-long axles. Then I put some stud-pins in the drive wheels and
used them to attach some 1x8 tiles. I don’t know the standard practice for
how they pair those up, but I figured they wouldn’t both be at the same point
in their rotation, so I’ve got them 90 degrees out of phase with each other
for now. 180 degrees seems like it would be more likely (one piston
extending while the other one retracts, so you’d just have to switch the flow
of steam from one to the other).
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Steam engines are double acting (the piston can have steam working against it
from both sides at different points in the cycle) so 90 degrees is the
appropriate offset. This alignment process is called “quartering the drivers”.
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Message is in Reply To:
 | | Re: Toy Story Train comments?
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| (...) I built a coal car over a 9v motor, and tried it out on a circle of track. It had serious problems running while pushing the engine in front of the motor. I tried adding some straights in to make an oval so it'd have a couple stretches without (...) (14 years ago, 3-Jun-10, to lugnet.trains, FTX)
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