Subject:
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Re: bushing (bush) question
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 25 Aug 2001 22:35:17 GMT
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Original-From:
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FRANK_SCHAFFER/FRA/ITELLIGENCE@SVCnomorespam-AG.NET
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Reply-To:
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Ross Crawford <RCRAWFORD@CSIavoidspam.COM>
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Viewed:
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821 times
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In lugnet.robotics, Thomas (T. J.) Avery writes:
> In lugnet.robotics, Elijah Meeker <emeeker@austin.rr.com> writes:
> > So, there are 3 types of 1/2 bushing:
> >
> > smooth
> > http://img.lugnet.com/ld/4265c.gif
> >
> > type 1
> > http://img.lugnet.com/ld/4265a.gif
> >
> > type 2
> > http://img.lugnet.com/ld/4265b.gif
> >
> >
> > Can anyone tell me why I would want type 1 vs. type 2? Are type 1
> > functionally different or just the a first try?
>
> They're pretty much the same. But I think Type 1 bushings often have a
> tighter fit than Type 2 bushings. It really depends on each specific part
> and its particular tolerances. I have some Type 1's that are extrememly
> tight fitting, and others that fit loosely.
>
> I keep all my Type 1's and Type 2's in one bin and use them without • looking.
>
>
> > Also, anyone have an
> > idea why they dropped all the toothing I see on older pieces?
>
> I think the biggest reason is that the Type 1's and 2's were prone to
> splitting in half. The teeth introduce a high stress concentration and a
> crack can easily form. I have split many of these.
>
> Also, the teeth are not often used for anything (e.g. used to lock an • axle).
> When I use 1/2 bushings, usually I just need a bushing 1/2 thick. I rarely
> need to lock an axle from rotating. Besides, the new 1x2 technic bricks • with
> axle-holes do a much better job of locking an axle.
Note also that Type 1 & 2 are also slightly wider than a smooth 1/2 bush -
about half the thickness of a tooth wider. Two of them butted together
(tooth
side) is exactly the same width as 2 smooths (or a single full bush). And
as TJ
says, they're noticably tighter fit, so 2 1/2 bushes holds much better than
1
full bush.
ROSCO
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Message is in Reply To:
 | | Re: bushing (bush) question
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| (...) They're pretty much the same. But I think Type 1 bushings often have a tighter fit than Type 2 bushings. It really depends on each specific part and its particular tolerances. I have some Type 1's that are extrememly tight fitting, and others (...) (23 years ago, 23-Aug-01, to lugnet.robotics, lugnet.technic)
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