It is currently Tue Feb 20, 2018 7:25 am Advanced search

home made RC monster truck

What welding projects are you working on? Are you proud of something you built?
How about posting some pics so other welders can get some ideas?

home made RC monster truck

Postby werner sline » Thu Dec 28, 2017 4:27 am

Hello everybody,

I thought i would share my built and ask you for advice at the same time !

i started welding for fun a couple of years ago. i welded a few tables and working bench for my house and here is the RC truck i built:
Image

it weight 6kg, wheelbase is 400mm, tires are 170mm diam.
it uses RC parts coming from 1/8 buggies and rc monster trucks like the transmission, the shocks, the body
its run on a common lithium polymer battery used in 1/8 th scale buggies
i built the chassis with aluminium from the hardware store and welded the axles + arms myself

Image

Image

Image

steering knuckles to replace the aluminium fragile ones ( left )
Image

why build a monster truck myself ? well the isn't any real durable / solid axles / scale looking monster truck on the market that money can buy !
so i built it myself : actually this truck is the 4th generation of truck i built so i made it better !

here some video of this thing in action :

https://youtu.be/QnyKhxF08Rg
https://youtu.be/SAOMhouGzv8

more videos on my chanel : https://www.youtube.com/channel/UCtL8N5 ... lymer=true

ok so my question is : i use 5mm piano wire rods to built the arms of my truck. there is a lot of stress in this area and just like the real monster trucks, it sometimes bends or break. but i'm actually quite satisfied so far. the thing is i need new steel rod for a similar project and my local supplier doesn't exist anymore !

so i found this : http://www.mcmaster.com diameter 1/4"
would this steel be durable enough for my kind of use ?
i noted that the piano wire breaks right after my welding under high stress or crashes : what did i do wrong ? is it because of the heat of the welding ? ( i use an inverter stick welder with 2mm stick @ 50 amps approx )

thank you for your help !
werner sline
New Member
 
Posts: 8
Joined: Wed Dec 27, 2017 9:56 pm

Re: home made RC monster truck

Postby clavius » Sat Dec 30, 2017 10:05 am

Wow, that is a serious project, very nice!

As to your question, I am no metallurgist, but piano wire is hardened and springy. It is likely that the heat of welding it altered the properties at that area created a brittle spot that breaks rather than flexes like the rest of the wire.

The Mcmaster link is bringing me to a search page rather than your specific product. But I'd guess a plain old steel rod may be less subject to breaking here as it will not harden so readily after welding.
clavius
Workhorse
 
Posts: 85
Joined: Wed Sep 21, 2016 9:32 pm

Re: home made RC monster truck

Postby werner sline » Sat Dec 30, 2017 5:59 pm

thank you for your reply
this little monster truck was a fun project but did indeed require much working hours ! which is ok because
this RC car does stunts like no other one !

the mac master rod i choose ( sorry for the previous bad link ) :
Ultra-Strength Easy-to-Machine 1144 Carbon Steel Rods

Yield Strength: 125,000 psi
Hardness: Rockwell C30 (Hard)
Heat Treatable: Yes
Max. Hardness after Heat Treatment: Not Rated
Containing more carbon and manganese than 1117, 1144 carbon steel offers higher yield strength and hardness, even without further heat treatment. Use it to fabricate parts that require stress resistance. Also known as Fatigueproof, these rods have enhanced strength and resistance to breaking from repeated impact compared to High-Strength Easy-to-Machine 1144 Carbon Steel Rods.
Ultra-Strength, 1/4" Diameter
https://www.mcmaster.com/#standard-steel-rods/=1awwg1b

previously i used piano wire rods ( plain rods ) but i never saw their specification.

to make it simple : are the rods i choose the best rods from mc master for my use and arc welding ?

by the way, you can see me weld @ 3min45sec in this video ( showing the previous monster truck i built )

https://youtu.be/WpAlaTrpNa0

HAPPY NEW YEAR !! :mrgreen:

Image

Image
werner sline
New Member
 
Posts: 8
Joined: Wed Dec 27, 2017 9:56 pm

Re: home made RC monster truck

Postby pgk » Thu Jan 04, 2018 6:44 pm

Nice project Werner, and even better finger control on those flips. :) The last time I tried that I landed one of buggies on it's roof, to heavy on the brakes lol. The last truck I did was a 5th scale Losi5ive, didn't do any welding on it but had a custom chassis made to set the motor back a couple of inchs and turned it 90 degrees, the front end is Losi the rear is Baja, everything else is custom. Two wheel drive instead of four, and sports a 71cc ALX Reed motor.. It's a 50lb handful.. Pic before it was quite finished without the cage on it.
Image
Esab SVI 300, Mig 4HD wire feeder, 30A spool gun, Miller Passport, Dynasty 300 DX, Coolmate 4, Spectrum 2050, C&K Cold Wire feeder WF-3, Black Gold Tungsten Sharperner, Ellis 1600
User avatar
pgk
Guide
 
Posts: 151
Joined: Mon Feb 09, 2015 4:48 pm
Location: Michigan

Re: home made RC monster truck

Postby werner sline » Sat Jan 06, 2018 5:22 pm

pgk wrote:Nice project Werner, and even better finger control on those flips. :) The last time I tried that I landed one of buggies on it's roof, to heavy on the brakes lol. The last truck I did was a 5th scale Losi5ive, didn't do any welding on it but had a custom chassis made to set the motor back a couple of inchs and turned it 90 degrees, the front end is Losi the rear is Baja, everything else is custom. Two wheel drive instead of four, and sports a 71cc ALX Reed motor.. It's a 50lb handful.. Pic before it was quite finished without the cage on it.
Image


now that's a BIG rc car ! people don't realize how big 1/5 scales are !

imagine a 1/5 scale rigid axles monster truck !! tires could be like 12" diameter !! that would crush things !

anyway i ordered this at mac master :
6628K23 select lenght 1 ft , QTY 20
Easy-to-Machine 1144 Carbon Steel Rod, Ultra-Strength, 1/4" Diameter

rc cars mostly use plastic and aluminium for their lighter weight
but i sometime build part for rc with steel : you can make complex shapes, it can be quiet thin yet durable. of course it will always be haevier than a professionnal CNC machined aluminium piece...
werner sline
New Member
 
Posts: 8
Joined: Wed Dec 27, 2017 9:56 pm

Re: home made RC monster truck

Postby pgk » Mon Jan 08, 2018 3:35 pm

Yah no doubt, looks like yours is pretty robust with some of those landings you were doing with it. I have since switched over to 1/4 scale wheels and tires, kept blowing the 1/5th scale tires off the rims. the rear control arms are made from 1/2" thick aluminum. This car would be destroyed if I tried doing some of the ariel stunts you do lol. It's more at home on soccer field where it can flex it's 20 HP!! What foams are you running?
Esab SVI 300, Mig 4HD wire feeder, 30A spool gun, Miller Passport, Dynasty 300 DX, Coolmate 4, Spectrum 2050, C&K Cold Wire feeder WF-3, Black Gold Tungsten Sharperner, Ellis 1600
User avatar
pgk
Guide
 
Posts: 151
Joined: Mon Feb 09, 2015 4:48 pm
Location: Michigan

Re: home made RC monster truck

Postby werner sline » Tue Jan 09, 2018 4:58 pm

i use the foams supplied with the team associated mgt tires : regular cheap foams
it can be seen here : https://www.rctech.net/forum/monster-tr ... ion-9.html

monster truck tires and rims that look good are really hard to find. the rim is often too big in diameter and the tires are often too narrow.
i was ready to build my own rims until i found the hong nor ones ! and they are surprisingly durable ! i didn't break any !
the tires i use are actually shaved to look good


my next project is a stretched hobao hyper mt to mimic a 1/5 buggy ; the hobao hyper mt is a great durable basis. i can't wait to see if i can do freestyle jumps with a kind of 1/5 scale ( i say kind of because it wil have the size but not the weight )

i didn't buy a real 1/5 scale because those are so heavy that i would need 8s lipo and esc to move the thing properly...
werner sline
New Member
 
Posts: 8
Joined: Wed Dec 27, 2017 9:56 pm

Re: home made RC monster truck

Postby werner sline » Tue Jan 09, 2018 5:17 pm

pgk wrote:Yah no doubt, looks like yours is pretty robust with some of those landings you were doing with it. I have since switched over to 1/4 scale wheels and tires, kept blowing the 1/5th scale tires off the rims. the rear control arms are made from 1/2" thick aluminum. This car would be destroyed if I tried doing some of the ariel stunts you do lol. It's more at home on soccer field where it can flex it's 20 HP!! What foams are you running?


by the way what 1/4 scale tires and rims do you use ?
20 hp is some serious power !
werner sline
New Member
 
Posts: 8
Joined: Wed Dec 27, 2017 9:56 pm

Re: home made RC monster truck

Postby pgk » Wed Jan 10, 2018 1:14 pm

I use this guys tires: http://www.bishopracingproducts.com/ the motor is made in Italy, I took a chance and bought the first one that was sold in the US. turned out to be a beast of a engine. The guy also makes 100 cc twins!, 78, 71, and 48. Here's a video of one his 78cc power rating is about the same but has more torque.. :) https://www.youtube.com/watch?v=Bk8IUAyx6pk This was back in 2015, he has since made plenty of improvements in performance, I believe back then he was using Athena cylinders, I believe he's using Malossi racing cylinders now and has also improved pipe designs. Everyone that runs his motors are also running wheelie bars for a good reason. LOl
Esab SVI 300, Mig 4HD wire feeder, 30A spool gun, Miller Passport, Dynasty 300 DX, Coolmate 4, Spectrum 2050, C&K Cold Wire feeder WF-3, Black Gold Tungsten Sharperner, Ellis 1600
User avatar
pgk
Guide
 
Posts: 151
Joined: Mon Feb 09, 2015 4:48 pm
Location: Michigan

Re: home made RC monster truck

Postby werner sline » Wed Jan 10, 2018 4:13 pm

holy nipple ! now that is some serious sh*t !
the video show a gound destroyer machine !

i'm not into nitro but i understand the excitement of sound and smell !
werner sline
New Member
 
Posts: 8
Joined: Wed Dec 27, 2017 9:56 pm

Next

Return to Welding Projects - Welding project Ideas - Welding project plans