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  #1  
Old 04-07-2014, 02:52 PM
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Default ati's scale course scale bridge finished ! NO updates

Hey all,

For those knowing me as the actros 4144 builder, I really needed to get my hands on something functionnal and RC.So I bought a gelande 2 from RC4WD. I will post about it as soon as I have interesting things to show.

I'm now building a scale course in my grand-parents' backyard.

What I want is a terrain pushing the gelande to the limits, I think we call that light rockcrawling. Very technical and very slow movements.

So here is the land :
2.5*7.2m area with view on the Mont Blanc when the sky is free of clouds over 160km



here are a few WIP pics :











dirt and water for the joints :













and here it is today, after 17 hours of work :





Now I want to build a bridge, a very scale one (oh oh ! what a surprise ). Wooden one, old mountain style, 1,4m long, around 4Kg of pine solidworks says.
Here is the bridge that inspires me (not my pic) :



And here is how I want it :



Where it will be :



Wood sections are in mm : 30x30, 14*30, 14*14 and 10x21 for the boards in contact with the tires.

Here is how the pieces will be assembled : pegged mortise and tenon, classic joinery assembly technique
(test parts, 9x9mm section)







Bought all the wood necessary, and had to adapt my metal band saw to cut long wood sections :





"We're almost there ! " :



Works not excellent but well enought for temporary use :



30x30 square "split" :



Broken blade



All wood is cutted and ready for planing (a friend will help me, he is equiped )



Next updates very soon (yes I still use the words "very" and "soon" together problem ?)
Hope it will give you inspiration, and if some wants to try it

Alex
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  #2  
Old 04-09-2014, 10:18 AM
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Should be.awesome
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Old 04-09-2014, 10:45 AM
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Looks like a beautiful place to live - should be a fun course when it's done
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Old 05-11-2014, 03:13 PM
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Hey

Thanks ChuckATruck and Doug

Yep Doug, nice view and all the space needed to do cool things

Just wanna mention that I said "Next updates very soon" and here I am, on time (for the first time )

So, just finished the bridge assembly
All it needs to be finished is a few coats of varnish/stain

A few specs about it :

-1440mm long
-409mm wide
-355mm high
-5 Kg
-pine, steel and glue only
-488 nails
-24 screws
-8 bolts
-76 2mm turned pegs
-127 wood pieces (excluding pegs)
-3 hours of CAD
-40 hours of realisation
-and probably 2000+ hammer hits








And for those who have doubts about how big it is, here are two pics that should help you :





Ok now machining and construction pics

On one hand, there are easy parts to do :



And on the other hand, parts for which I scratched my head many minutes, and tried different configurations to get a decent fixture to machine them :



Yeah, THE thing to consider is that I don't have to machine 1 or 2 identical parts but more like 12, 16 or even 50.
This is why it's very important to have a quick and reliable part holder. By reliable I mean the part must have always the same position, nothing has to be adjusted. You put the piece, you clamp and heeeeere we go ! Yeeeeehaaa ! This way the assembly process is flawless and everything is (pretty - eh it's soft wood...) straight.



Using the lathe as a mill :
(off topic : used today my mill as a swiss lathe, worked very well and saved me a lot of time... Just to say, use what you have, it's fun !)





Nice offset heh !



And my favorite hardcore machining "jig" for 220 mm long parts







Let's get back to conventional things, too much emotion making hardcore machining

Turning the 2 pegs out of 6 beech rods, needed 2m+ of it !



And now, the assembly :

"woow it's huge" :



all the parts gathered :





127 parts I tell you, you can count...



Began by assembling the fences :





then assembled the structure and "pavement"
Used shims to space regularly wood parts to get a nice look :





fence base : at first, I drilled peg holes in the tenon before assembly, but because there wasen't enought play in the connection, a few tenon broke during disassembling. Fortunately, I tried before making all the parts this way.



That's why on the other parts, I drilled the peg hole in the tenon after the assembly. And to do so I had to use what I had : heavy duty LEGO Technic bevel !



100% Lego parts, press fitted the drill bit in an axle after having drilled it on the lathe
Nothing turned round so I added 2 big U joints, and I lubricated this beast



Did the job with this 1.9 drill bit, but was not far from the maximum capacity

Needed a stiff stop during pegs installation with hammer (press fit) :



And needed imagination to solve small problems :



And tada ! :





Who has the most beautifull one ? Solidworks or me ?



Thanks for watching, hope you like and it gives you inspiration.
Ask if you have any questions and have fun doing what you like !

Alex
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Old 05-11-2014, 07:28 PM
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my lord that is beautiful man. you got solidwerks beat hands down.
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Last edited by BiLLy bOb : 05-12-2014 at 07:50 AM.
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Old 05-12-2014, 07:16 AM
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WOW! Seriously impressive bridge! Let's see it out on the course!
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Old 05-12-2014, 08:17 AM
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This is an awesome piece of craftsmanship. Gongratulations to this nice bridge!
You wont sell it as an assembly ready kit, dont you?

Regards
Sven
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Old 05-13-2014, 04:56 AM
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MB actros 4144 AK in construction ...
 
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Thanks you all for great comments !

The Stray Cat, I don't yet have decent pics of it outside, will think about it once it's dry and the weather is ok.

Sven, I'll pm you about that.

Alex
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Old 05-13-2014, 11:42 AM
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Easy to forget how beatiful structures bridges are. Great work!
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Old 05-14-2014, 02:05 AM
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Wow, just wow.
That's it, I'm building a bridge. I have no place to put it, but I need a to make a bridge!
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Old 05-14-2014, 09:48 AM
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Thanks Motom !

Quote:
Originally Posted by Honger View Post
Wow, just wow.
That's it, I'm building a bridge. I have no place to put it, but I need a to make a bridge!
Haahhaha
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Old 05-16-2014, 08:41 AM
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That is a beauty for sure! Makes me want to build another bridge... Nice work.
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Old 05-18-2014, 02:43 PM
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Hey all

Thanks Doug excellent work on your course, awesome bridges ! I especially love your work on the shell station

Finally finished to apply stain on my bridge, color is "dark oak"

This is a much more difficult and long task than I thought.
I'm not used to this type of things, actually, it's the first time I do something that complicated.
It's hard to give an uniform thickness (and so color) to the stain, mostly because of small surfaces and hundreds of corners, and also because it dries very quickly, something like 3 minutes.
It took me 8 hours to finish (1 coat, yes 2+2+2+2 hours...), it's very far from being perfect but I like it like that.











And then, I wanted to know more about it's playload.

3 kg of the gelande > ok (1.5 metric tons at 1/8 scale)
I could have tested 5, 10, 15, 20kg... but I was confident...
So I tested the 28 metric tons weight (56kg) I had laying around here : me
I don't like to compromise strength for beauty...



Nothing to add I think.

Alex
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Old 05-19-2014, 03:13 AM
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Alex,
I would have wetend my pants just by thinking about stepping on that beauty!
By the way, what is maximum width for cars that can pass the bridge? Looking at the Gelande, I woul estimate something araound 22-23 cm, right?

Sven
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Old 05-19-2014, 05:02 AM
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Hi Sven,

Inside width from fence to fence is 260mm, because of the wood pins the usefull width is 255mm. So yes, I think the maximum overall width of the vehicle is around 23cm yes.

Alex
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