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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Thu, 1 Jun 2006 23:44:40 GMT
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Viewed:
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8902 times
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In lugnet.technic, Nathan Bell wrote:
> 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:
> >
> > 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
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. This cable is used up as both the mid and front sections of the boom
extend.
When closed, the boom will lift 12 16 stud technic beams. It won't lift any at
full extension. The pneumatic cylinders are badly placed. I was trying to have
the model looking as close to the original. Check out
<http://www.kdmanitou.com/mrt1432.htm>
Also I got to the stage where I didn't want to have to rework the whole upper
chassis, so that the pneumatic power would improve. Also I wouldn't recommend
the micro motors, as there is little power there. They were used to give me the
wide range of movement needed on such a machine.
For me the thrill of it all is watching the machine lower stabilisers, rotate,
raise, extend and tip the forks all at the same time!
By the way, your Telehandler was part of the inspiration for mine. The other
part was watching one of these machines on a building site near us.
Keep building,
Mervyn Tomb
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Message is in Reply To:
 | | Re: Manitou Rotary Truck
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| (...) 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 (...) (19 years ago, 19-May-06, to lugnet.technic)
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