Subject:
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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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Fri, 25 Jan 2002 21:04:49 GMT
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Viewed:
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2982 times
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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 :-)
TJ
http://www.texbrick.com/ideas/gears/
FUT where appropriate
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Power Pullin' With My Tractor
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| In lugnet.technic, Thomas Avery writes: Thanks for the update! (...) 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. (...) (22 years ago, 25-Jan-02, to lugnet.technic, lugnet.trains)
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