Subject:
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Re: Manitou Rotary Truck
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 19 May 2006 16:16:50 GMT
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Viewed:
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8178 times
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In lugnet.technic, Mervyn Tomb wrote:
> I'm just letting you know that I have finish my latest MOC
>
> It is based on a Manitou Maniscopic Truck.
>
> It can be viewed at <http://www.brickshelf.com/cgi-bin/gallery.cgi?f=182576>
>
> It features the following:
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> Four wheel drive with four wheel steering.
> Pivoting rear axle.
> Motor driven front and rear stabilisers.
> Three stage motorised extending jib with rotation and pnuematic raise/lower.
> Remote controlled forks.
> Ancillary on board air tank.
> Main remote unit with air storage, pump and five way motor controls.
>
> It took a long time to get this machine to this stage. There was a lot of work
> to make the axles with steering strong enough the carry the weight of the
> machine. There was also big problems with balance. I managed after significant
> gearing down, to get outriggers that would take the weight of the machine and
> therefore improve stability.
>
> I know that the three stage boom is slightly bulky, but it works very well with
> less deflection than on a two stage at that length. The forks can handle limited
> load, due to the micro motors, but they use a lighter and tidier cable, than a
> pnuematic alternative. One neat feature is the way that the excess cable for the
> for fork tilt is neatly dispensed as required.
>
> The pnuematic 4 gang cylinder for the main lift of the boom really struggles if
> there is any extension of the boom. Such to the extent that there would be some
> compression of the cylinders at certain angles. I guess that's why hydraulics is
> generally used.
> I would welcome your comments. Is anyone prepared to develope the concept
> anymore???
Great job Mervyn!
That looks quite involved. I am not familiar with that model, but it looks like
a telehandler crossed with a mobile crane. It is definately more complex than
the telehandler I did (in the "previously featured MOCs" section of this site).
However, even though a pneumaticly operating fork is bulky, it pays off in the
end. My telehandler could lift 2 XXXL (10.8 cm) Off-roader tires+ to full
height without tipping over - which is partly due to a pneumatic fork. However,
having a turning platform in your design (Manitou's design) would make that
almost impossible without extra support under the turntable and pneumatic
outriggers.
How did you get the chord for the fork motor to wind up when the boom is
retracted? That was slick! How much can it lift? That boom can sure tilt
high!
Nathan Bell
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Message has 1 Reply:
 | | Re: Manitou Rotary Truck
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| (...) Thanks for your comments, In picture P5061994,jpg you will see a little grey axle pin just in front of the driver's seat. This is on the mid section of the boom. As this section moves forward it actually releases twice the amount of cable. (...) (18 years ago, 1-Jun-06, to lugnet.technic)
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Message is in Reply To:
| | Manitou Rotary Truck
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| I'm just letting you know that I have finish my latest MOC It is based on a Manitou Maniscopic Truck. It can be viewed at (URL) It features the following: Four wheel drive with four wheel steering. Pivoting rear axle. Motor driven front and rear (...) (18 years ago, 8-May-06, to lugnet.technic)
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