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Big Rigs, Multi axle, & Tracked Vehicles The place for "Semi" talk!
Tamiya and Wedico Tractor trailers!
Tamiya and other brand R/C Tanks and Tracked vehicles. And any vehicle with more than 2 axles; 6x6, 8x8, 10x10, etc!


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  #256  
Old 02-04-2013, 09:11 PM
aykdriver aykdriver is offline
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Quote:
Originally Posted by ST1100 View Post
Some state of the art work here

No coolant needed on the aluminum?
Clogged cuters drove me crazy on the Proxxon, tried spiritus(sp?) at first, changed to proper drilling oil...
And aluminum chips are a MESS!!
if it's anything like what i use, you can get cutters with a special coating that doesn't require coolant. i personally still do when i'm burying the tool, but when i'm doing outside work like this, i don't bother.

gorgeous work man, truly an artist with metal!
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  #257  
Old 03-19-2013, 04:09 AM
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Ati Ati is offline
MB actros 4144 AK in construction ...
 
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Hey all and thanks again for kind words

So, the front axles are being completed and finally looks like axles

After the axle casing, made knuckles, hubs, ring gear holder,ball bearings adaptaters, and brass bushings for direction pivots (8 per axle)

brass bushings for 1 axle : ID 3mm reamed after press fitting, OD 4mm oversize, length and flange thickness variable




all bushings are press fitted with the help of a drill vice





same for the knuckles



then I milled the bushings surfaces to minimize the backlash
traming the part to mill perpendicular to the rotation axe :



here is the familly once everything is press fitted



once front axles are assembled



screw is just here for holding parts together, a turned steel pin will be used in the final model...



On the ring gear holder, which is the part installed inside the hub, you can see the 4 tapped holes (inner ones) for the 4 M2 screws fixing the knuckle to the ring gear holder, 4 outer ones are to fix ring gear to ring gear holder



finally an overview of the project progress (many small parts are made but dosen't appear, like rear Y suspension link, first leaf spring, differentials (4 are made), pulleys of the 2nd axle relay case...)
rule is 500mm / 20"






Here is a small riddle, if you find this word, you'll know what I dream to install on my truck, probably the trickiest option but I'm pretty sure I can do it, Well I want it so much that fail is not an option **U*****O**
good luck ^^

Hope you like

Alex
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Last edited by Ati : 04-02-2013 at 02:28 PM. Reason: not clear explanation
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  #258  
Old 03-19-2013, 09:35 AM
Micha Micha is offline
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Wow, wasn't here for a while, and I am absolutely astonished about your work here. Great job so far!

And whatever it is you were thinking will be the trickiest option, I am confident that you will manage it! Unfortunately to guess I would need another hint, so far I am at a loss of what it could be!

Michael
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  #259  
Old 03-19-2013, 01:20 PM
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dirchsen dirchsen is offline
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So. let me try...







Hmmmmm..............












Is it Robert?


















Or Rumpelstiltskin?







Or - a KNUCKLEBOOM?






Harhar!

;-)

d.
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  #260  
Old 03-19-2013, 02:34 PM
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Ati Ati is offline
MB actros 4144 AK in construction ...
 
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Thanks Michael

Quote:
Originally Posted by dirchsen View Post
So. let me try...
Hmmmmm..............
Is it Robert?
Or Rumpelstiltskin?
Or - a KNUCKLEBOOM?
Harhar!
;-)
d.
"Rumpelstiltskin" yes, yes, very well

Knuckleboom ! well done


I talk about it to you cause in real life, trucks and knuckleboom are 2 independant parts (almost). The knuckleboom can be installed on the trucks with minor modifications. It's a kind of "plug and play" for experts.

Contrary to 1:1 scale, for me, truck and knuckleboom can't be considered as independant. I'm mostly thinking about all the hydraulic components like pump and valves which can't be scaled down enought to be fitted like in real truck. That's why all theses "big" parts must be taken into account during designing phase to be well integrated.

I think about it since a long time, and the first parts taking in consideration this "tool" will be made soon...

Alex
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  #261  
Old 04-01-2013, 10:08 AM
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Honger Honger is offline
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Your axles are beauties... Just gorgeous.
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  #262  
Old 04-01-2013, 10:35 AM
JAMMER JAMMER is offline
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Default Axles

Alex you have preformed some excellent machine work on your axles they look great. Keep up the good work. Ed
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  #263  
Old 04-02-2013, 09:02 AM
KingBob KingBob is offline
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Awe is not a strong enough word. Totally amazing.

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  #264  
Old 04-02-2013, 11:26 AM
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grumpygrady grumpygrady is offline
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Default tilt , caster and camber

i do believe that the tilt you are wanting is a result of caster and camber not the axle ,
both have to do with the angle of the king pin
caster is done by tilt the axle on a 4x4 with wedge shaped shims under the spring pack

here is a page about both
http://www.s10extremist.org/tech_art...ter_camber.htm




Quote:
Originally Posted by Ati View Post
Hey [coughing] Hey all, what a thick of dust in this thread :lolcat:

Everything is finally working fine here

So, a few news of my truck :


The main features of the front axles are designed

Pivots were hard to design to allow a steering angle of +/-45, maybe the steering links will limit it to +/-40, but I'm not yet sure so...

I've abandoned my wish of making the wheel tilting during a corner because I've not been able to find a nice and scale design, without having to mill most of the axle housing in 3D (which would have made way too long milling operations)


Here is the design I'm heading to :







Alex
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  #265  
Old 04-02-2013, 12:39 PM
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Tomsloat Tomsloat is offline
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Stunning axles
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  #266  
Old 04-05-2013, 03:09 AM
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Ati Ati is offline
MB actros 4144 AK in construction ...
 
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Thank you all for kind words

Quote:
Originally Posted by grumpygrady View Post
i do believe that the tilt you are wanting is a result of caster and camber not the axle ,
both have to do with the angle of the king pin
caster is done by tilt the axle on a 4x4 with wedge shaped shims under the spring pack

here is a page about both
http://www.s10extremist.org/tech_art...ter_camber.htm
Grumpygrady, very good link thanks, good for my technical english
I'm not sure to understand well but if I do, I don't agree completely with you
I think the camber is independant from the angle of the knuckles pivot axis, as nothing tells that the wheel axis is perpendicular to the pivot axis (viewed from the front)

Let's talk with pictures :


on this one, there is no camber (tire is vertical viewed from the front when steering is at 0) but the knuckles pivot is not vertical (viewed from the front)


I made 2 versions of the steering geometry :
1st is how real actros are and how I wanted to do
2nd is how I made

Things to know :
axle casing (blue) knuckles and wheels (orange) steering link (white) knuckles pivot axis (black)
no ackerman for simplicity


--1st version


we see there is no camber

we see there is caster


we see the inner wheel during a corner tilts more than the other



--2nd version

we see no camber

we see no caster

during a corner, both wheels stay vertical



What is not taken into account is the fact that the front axles are mounted on leaf springs. These leaf springs tilt forward and backwards because of the weigh repartition system so it will act like a "variable caster".
Here is an example of this system :

Because of this weigh repartition system, and the complexity that would have been involved during machining, I made it simple

Alex
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  #267  
Old 04-05-2013, 05:02 AM
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8BALL 8BALL is offline
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just bloody brilliant even at that stage...
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  #268  
Old 04-05-2013, 03:37 PM
lewlew lewlew is offline
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Amazing work! So detailed. just a very nice clean build.
nice job to you sir.
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  #269  
Old 04-06-2013, 12:10 PM
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grumpygrady grumpygrady is offline
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if the axle is tilting on the springs you are having axle wrap and the main springs are to small .or you need an extra link to stop it
but i think that when you add caster and camber you will get the tilt you want as the center does not change during a turn so the wheel has to change
angles ,and like i said they adjust the angle with wedges between axle and spring
any way your model is a piece of art and i look forward t the next steps
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  #270  
Old 04-07-2013, 01:42 AM
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Ati Ati is offline
MB actros 4144 AK in construction ...
 
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Thanks for cimpliments

Grumpygrady :
Axles are not tilting on springs, axles and springs are tilting on the chassis (well, there is not axle wrap on the 1:1 one which dosen't have link, so mine shouldn't have)
I'll remember wedged, thanks for the tip
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