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, 21 Feb 2008 21:08:35 GMT
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Viewed:
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12259 times
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In lugnet.technic, Gordon Bentley wrote:
> I can't see from your photos how you're stopping the main structure lifting off
> the base.
>
> Correct me if I'm wrong, but crane turntables hold the superstructure down so
> the load moment is transferred to the crawler base. I've seen photos of cranes
> tipping and they don't fall off the turntable, they take the base with them.
This is correct. Real cranes have roller bearings that are pinned in place that
bear the weight and force of the superstructure where it is connected to the
base.
> I've had a couple of (incomplete) goes at a crawler, and I've used two
> turntables, one inverted, with the centres tied together and to the
> superstructure, and the outer rings locked into the base. That way, the
> superstructure can't detach from the base.
I am going to use a threaded axle through the center to hold the plates down,
and then typical beams and plates connected perpindicularly by vertical beams to
hold down the rest...(still working on the final design)
>
> Great looking model so far though.
Thanks! Check back in from time to time for updated progress!
>
> Regards
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Message has 2 Replies:
 | | Re: New Crane...
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| Impressive supply of Technic beams you have there :-) The completed model is going to be a monster. Nice job. (...) I've been checking out the design of the dual CC8800, and it appears to not really require that the turntable resists overturning (...) (16 years ago, 12-Jun-08, to lugnet.technic)
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Message is in Reply To:
| | Re: New Crane...
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| I can't see from your photos how you're stopping the main structure lifting off the base. Correct me if I'm wrong, but crane turntables hold the superstructure down so the load moment is transferred to the crawler base. I've seen photos of cranes (...) (16 years ago, 21-Feb-08, to lugnet.technic)
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