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Thread: Margouillat

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Old 01-18-2017, 05:04 AM   #1
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Join Date: Jun 2011
Location: Le Mas Petit 81 France
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Default Margouillat

Hi!

Here my new shafty



It's a Margouillat
the last world championship winner

I've put my first crawler body (in memory ) but it's really tired and a new will arrive



Chassis is 2.5mm CF, with 3D printed gearbox/ skid combo, RC4WD gears and reinforced bearing balls.
Upper links are made with CF 4mm rods
Lower links are Ti grade 5 4mm
with traxxas rodends




SDI transmission shafts to link gearbox and axles: really thin and light, they're perfect for the margouillat

17T 32Dp is required so I've milled one in delrin, excellent for this app (Cf delrin datasheet ;) )





I've choose to mount my favorite axle: SCX housing+ beef tubs+ XR10 shafts on front
I milled 3mm CF plate to support servo, lipo and uper links





Some VP knuckles are in project and I'll mount bombproof margouillat steering kit





Ti 4mm steering link is mounted behind the axle to have a real ackerman effect



The rear axle is 100% prototype, except the dif
I use hot racing UD
Ti 5mm grade 5 single shaft
ultra light spool
delrin bushings, housing and arms




Rather than mount a UD in the front, I played on the diameter of the wheels with the maximum authorized size (Losi rock claws on voodooo sides) for front and little boss claws on the rear.
I have to try it

Wheels are in polycarbonate, extra strong material, using PVC beadlocks (4g each), delrin hubs for the rear and alu for the front, with delrin spacers

I use axial shock with Losi springs, TGS delrin spring cups (upper and lower)


and you can see that it misses plate to close axle housing
It will arrive

Electronic parts to drive the machine
HH Br mini
CC BEC
Hitec 8385TH
integy 45T Arghh! (waiting puller 400 16T )
gt3b
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Old 01-18-2017, 11:21 AM   #2
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Join Date: Nov 2010
Location: Spain
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Default Re: Margouillat

Hello. Amazing project!!! Let ask you one question.....why your left rear link is upper than the right rear link?
Thank you!!
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Old 01-18-2017, 11:58 AM   #3
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Default Re: Margouillat

Hello

Thank you
This is to contra torque twist.
Toto Rax has experienced and find it's better.
I haven't ride yet and setup is "free"
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Old 11-29-2017, 05:14 AM   #4
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Default SCXR10/AR44 margo

Hi!
After a long breack, I'm back with lot of news on my margo
All the pieces come out of my workshop

SDI steel transmission shafts are replaced by Ti-6Al-4V (all Ti I'm using has this grade)



I rebuilt the front deck for a lightweigt deck, milled in 3mm CF for the central part and 2mm for electronic support





The shocks supports are milled in aluminium





Supports are lower as possible to put the servo and lipo in 500mAh will take place at the opposite side to equilibrate the axle

The main changement is the rear axle
I take an axial AR44 housing which I grinded : links supports, edges. It just remains "the housing"
I drill the sides to put 3K CF tube 10x12mm
I cut a CF dif cober to be full CF
23 aluminium supports are screwed on tubes on steel rings inside (aluminium is not enough strong to support the thread)
The driveshaft is a single 5mm Ti shaft, mounted on an aluminium spool, with circlips to retain bearing balls on the end of the tubes.
Shims before the hubs's pins put them in place.
the upper links mount is milled in 3mm CF and 6mm delrin to screws the rodends on it







To mount the spool, I built aluminium lockers



They are used to screw the upper links support, too




Using the SCXR10 on front, I had to return the AR44, but it's a good stuff, because like that, the diff pinion "unscrews" the main gear and stays stucked on the housing and doesn't lock on the spool
I put a shim on the outside shaft to be sure that stays unlocked in backwards

Weight holders milled in aluminium, with plumb weights (it's easier to find and mold ) they have the same weight than tungsten slugs.



the mold




I mill some 7075 alu pinions to replace the RC4WD.
11g (with Ti 5mm output shaft) versus 30g. My COG is really happy about this new



I build Dlux style knuckles with 3mm CF and big aluminium block, supporting tungsten weights
I precise they are not a copy, I took quotes and draw them myself (and I build them only for me )








And to finish, I made my own lexan body
Some CAD, foam milling with plaster master
and the lexan forming machine



It is designed not to be pretty, but to be in rules limits and do easier the roll overs





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Old 11-29-2017, 05:55 PM   #5
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Location: central VT
Posts: 1,606
Default Re: Margouillat

This build is insane! Over the top, from scratch building at its finest.

How many hours do you estimate you have into your knuckles? Do you use "balls" inside flanged ball bearings in place of conventional kingpin bushing like the DLUX versions? Or have you found a way to improve upon the design in some way? I ask because my only irk about my DLUX knuckles is that I don't like how the bearing must pivot on the ball as the knuckle is steered if using the 8* kingpin inclination. It seems that possibly, theoretically, maybe the inner ball could wear down with much use? Or maybe I'm over thinking it. Either way, great job and keep us updated on your progression.

What's your rtr weight down to now?.
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Old 11-30-2017, 02:34 AM   #6
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Default Re: Margouillat

I'm really cool with my tools.
Therefore, I prefer take the time and save the machine instead of to go fast and break all
To mill aluminium parts, it takes 1h15, you add a passage on the lathe machine to do the bearing balls's places on the interior side (for me, it's easier than return the part on the CNC).
Around 15 minutes to mill CF parts. And I don't know how much time to drill and to thread the alu pieces to screw the CF parts on them.

I use traxxas rod ends on which I cut a side



And at last , I turned delrin flanged bushings with a height of 3.5mm: 3mm inside the CF and 0.5 for the flange





The weight is 1950g with 500mAh lipo and weights.
All screws are stainless (alu could save lot of grams but they're not the best to mount and unmount day after day)
Perhaps, one day I'll put alu or ti screws, when I will be sure to stop to unmount it.

it's hard enough to hold on the ground




the point of balance
he is not leaning on anything


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Old 11-30-2017, 08:59 PM   #7
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Default Re: Margouillat

Any video of it in action?


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Old 12-01-2017, 04:06 AM   #8
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Default Re: Margouillat

If the weather is not too bad this sunday, it will be done
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Old 12-07-2017, 02:40 PM   #9
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Default Re: Margouillat

Hi!
Sunday was too cold to run.
But today, temperatures are more clement and I could do some runs and this video

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Old 12-07-2017, 10:37 PM   #10
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Default Re: Margouillat

Looks like it works great


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