Subject:
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Re: Dennis Bossman's crane
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 15 Oct 2004 12:07:31 GMT
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Viewed:
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3518 times
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In lugnet.technic, Nathan Bell wrote:
> The pump lowers the front legs and raises the trailer off of the tractor. With
> the dozer on the trailer, it takes about 28 pumps; without the dozer it takes
> about 23.
>
> I have never been to that website before, but it has good ideas on it. The
> joystick design I used is similar to the "Wirlwind Rescue" chopper design from
> 1990 (I don't know the number). Do I need to put more pictures on brickshelf?
> Maybe on lugnet.
>
> No one has asked, but the reason that the track hoe arm is different from the
> real thing is because 2 pistons back to back are strong enough to lift the arm
> (4 are not needed). At the elbow, the pistons are side-by-side and not
> back-to-back because Lego pistons do not pull (retract) with enough force. 2
> side-by-side pull better than 2 end-to-end. Also, the telehandler will probably
> use the last 5 of my big pistons- if so, none will be left for the track-hoe.
> I'm sorry if I gave too much information.
Not at all - thanks for all the answers.
> Nathan
- David
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Message is in Reply To:
 | | Re: Dennis Bossman's crane
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| The pump lowers the front legs and raises the trailer off of the tractor. With the dozer on the trailer, it takes about 28 pumps; without the dozer it takes about 23. I have never been to that website before, but it has good ideas on it. The (...) (20 years ago, 13-Oct-04, to lugnet.technic)
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