Subject:
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Re: Gear and Axle Strength (was Re: Power Pullin' With My Tractor)
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Newsgroups:
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lugnet.trains, lugnet.technic
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Date:
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Sat, 26 Jan 2002 00:00:57 GMT
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Viewed:
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3187 times
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Thomas Avery wrote:
>
> In lugnet.technic, Larry Pieniazek writes:
> > Long long ago, when I first got into the hobby, I was corresponding with
> > John Gerlach about lift bridges and he reported axle failures, but it was
> > due to shear rather than torque.
> >
> > He had a (lift) bridge so heavy that a single axle at the axis of rotation
> > could not take the weight, it kept shearing. He used a technique involving a
> > gear! Rather than the bridge having an axle pivot, the truss was pinned to a
> > gear and that gear rolled in a number of 8t gears on the abutment that
> > together, kept it confined around an axis of rotation as it moved.
> >
> > I copied .trains so he can correct me if I misremembered.
>
> That sounds like a very good solution.
>
> My solution to preventing axle shear has been to create multiple shear
> planes (like the hinges of the boom on my crawler crane). The problem is
> that it takes up a lot of room and there can be a lot of friction. When you
> put an axle through multiple holes, it's difficult to get the holes to line
> up perfectly so that axle spins freely.
>
> I am satisfied with the strength of Lego axles. I just wish the gears were a
> little stronger :-)
Has anyone tried making an axle of 2x2 round bricks with bearings made
from 1x4 arch bricks? I just played with it a little and it looks like
the bearing would work ok. You could also make a bearing from macaroni
bricks, but I think it would be harder to get a strong bearing (the
arches can easily be built into a frame which would hold them pretty
good). Of course if you're putting serious load with lots of cycles
you're going to get some pretty worn bricks.
Frank
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