Subject:
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Re: New Crane...
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 10 Jul 2008 11:27:53 GMT
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Viewed:
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15242 times
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In lugnet.technic, Thomas Avery wrote:
>
> You're dealing with a relatively shallow boom cross section (i.e. thickness is
> fairly thin compared to length). I don't think you'll see much improvement
> unless you make the boom cross section thicker (deeper), which unfortunately,
> you probably can't if you're keeping things in scale.
>
> Also, you have doubled-up beams for the main chords on your boom truss, and that
> is adding a lot of weight to the boom. You could probably do without
> double-beams. Since you have a double boom (side-by-side twin booms), then with
> single-beam main chords you'd still have 8 Technic beams as your minimum cross
> section. That's plenty strong.
>
> You might consider re-designing your truss pattern so that the joints line up on
> one hole (example: http://texbrick.com/creations/msg_50/truss.jpg). But I'm
> thinking that will only give you slight improvement in overall truss stiffness.
> It's plastic, not steel :-)
You mean plastic bends?? Dang :)
I actually have had a good bit of success stiffening up the boom. The majority
of the give in the boom was coming from the point where the sections are pinned
together. The axles were flexing and letting the bottom two points at each
joint give a good bit. I strengthened these areas by placing plates across
them, and it has worked like a charm. I will post some pics this weekend of the
comparison between the former and the latest!
Thanks for all the positive comments and suggestions!
-Alvin.
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Message is in Reply To:
 | | Re: New Crane...
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| (...) faired better than my crane that decided to go down in a hurry (serious operator error :-) (URL) Looks like I need to stiffen up the boom a bit... (...) You're dealing with a relatively shallow boom cross section (i.e. thickness is fairly thin (...) (16 years ago, 9-Jul-08, to lugnet.technic)
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