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In lugnet.technic, Ronald Vallenduuk wrote:
> "Reinard van Loo" <Reinard-van-loo@chello.at> wrote in message
> news:Hnr2pH.AoH@lugnet.com...
> > Hello!
> >
> > Finally, I've got a new MOC. This time it took a long time to finish because of
> > other things to do, but now it's here:
> >
> > http://members.chello.at/reinard-van-loo/Lego/Scania.html
<snip>
> more please.... I'd like to see more of your
> front steering/suspension. How do you manage different steering angles on
> both axels with pneumatic steering?
After fooling arround with two setups, I threw in the towel and made it a simple
one: Each axis has its own pneumatic cylinder, there is *no* linkage between the
two... the only synchronised positions are far left and far right :-)
The reasons:
I first build the original Scania setup. (see
http://www.scantruck.com.sg/scantruck/scania/parts/chassis/steering/steering.htm,
look at picture titled 'Power Steering Gear, Dual Circuit Steering') It proved
to work only if there is no load on the wheels and the dead-travel of the lego
mechanism was just too large.
It was how Scania did it, but it did not result in a *working* model so I
scrapped it. Then I tried a more standard rack/pignion setup, but the linkage
between the two axels was not possible: If you look at the frame at the front
(arround the motor), you will see that the frame 'spreads' (as the real Scania
frame does, see http://imagebank.scania.com/pic_d/146072.JPG and for the lego
model http://members.chello.at/reinard-van-loo/Resources/motor_top%201.jpg)
Worse, this 'spread' does not follow Lego geometry, so mounting the two front
suspended steering axles is done using some tricks. ( see recently added picture
http://members.chello.at/reinard-van-loo/Resources/steering_axle_full.jpg for
steering axle set-up) This mounting is sturdy enough, but it is not possible to
put a good, strong linkage between the axles with the angles created by the
frame and suspension mechanism.(a strong linkage is needed because the forces on
the wheels make steering a heavy job...)
Soooo... finally I gave up, and implemented the pneumatic steering, which still
works when the frame is 'loaded' with the cab and container (and no studs under
the frame to support it...)
I think (I did not try this...) that the only LEGO steering set-up that supports
heavy weights is the good old 853 technic car steering (which I did not want to
use because I wanted to retain the basic axle design of Scania as much as
possible) or the 8880 super car suspended steering -although I doubt if the 8880
setup supports steering under heavy load...
Dennis, you should have some experience here, do you have some intputs?
da groet'n,
---Reinard
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Message has 2 Replies:
 | | Re: New MOC: Scania Garbage Truck
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| (...) In my opinion the strongest "traditional" steering setup uses these parts: (URL) I used them for my all terrain crane as below: (URL) I estimate the axle is bearing around 2kg, and still steers perfectly well. I ended up gluing the number 2 (...) (21 years ago, 6-Nov-03, to lugnet.technic, lugnet.modelteam, FTX)
| | | Re: New MOC: Scania Garbage Truck
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| (...) Yes indead I have some experience here. The biggest problem is de cab is getting bigger and heaver every time. Today's trucks has large driver's cabs and the ones on my creations consist of approx. 1200 to 1500 pieces (versions with sleeper (...) (21 years ago, 6-Nov-03, to lugnet.technic, lugnet.modelteam, FTX)
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Message is in Reply To:
| | Re: New MOC: Scania Garbage Truck
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| "Reinard van Loo" <Reinard-van-loo@chello.at> wrote in message news:Hnr2pH.AoH@lugnet.com... (...) because of (...) the (...) Wow! That's impressive! Show us more please.... I'd like to see more of your front steering/suspension. How do you manage (...) (21 years ago, 3-Nov-03, to lugnet.technic, lugnet.modelteam)
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