Dirty_Vinylpusher

Well it's that time of year again, time to start a new project

Actually this one I started a while back, but it got shelved and I dug it back out the other day when I was having a bit of a cleanup in the shed.

Here's some pics of the parts I made back then.




Front hub







Rear axle bearing housing.





Sprocket mount.










It'll have the same motor as this one did, the trusty old Stihl with angle grinder gear reduction.



Gear ratio should come in somewhere around 6.5:1 and I've fitted a stiffer spring from a pocketbike motor to it so hopefully it should get the revs up a bit better before engagement.

I'm going for the same sort of setup with alloy plate chassis and no suspension which works fine on the beach which is where I'll run it mostly.
It'll have much better ground clearance than the old version.




More to come when I get around to it, but it should be a bit quicker than other projects as I've got the majority of the parts and materials at hand.
Just gotta work out how to put it all together......

Dirty_Vinylpusher

More pics.



Air filter














Pullstart handle
















Rear axle will be mounted something like this














Front end




















Engine at the back












Ground clearance under the chassis.
Will be a bit less at the axles.



















And here's the first peek at the car in whole

Lars from Norway

Always nice to see when you dig out "forgotten" cars from the shed, hehe! And i see you have also re-invented the easy to adjust-caster angle from the seventees?

Dirty_Vinylpusher

Myeah, once it's in place it won't be adjustable.
Although if I wanted to change the angle I'll only have to replace the round tubing and put it at a different angle, so yeah, it's keeping the options open I guess.

I should add that I'll cut out the chassis plate and set the motor down a bit to lower the centre of gravity.

VassilisG

Wellcome back to the 'new project' world, mate.

Mudgy

Nice!! You're lovin' that lathe now aren't you? Some trendy bits going on there mate[8D]

Dirty_Vinylpusher

Cheers Vass.
I just wanted to build something simple that I can have a play with while I try to get my head around the big project.








Front end is on (sorta), and am now setting up the rear axle housing.





It'll have another angle on the other side holding it in place.
Will probably just pop rivet the angle to the square tubing.











Gone old school with the tooling.
Picked up this old hacksaw setup at the scrapyard for $5.
Works a treat.

mikula_os

Love it because it is so simple but functional.

Won't have any suspension?

Dirty_Vinylpusher

Yeah the lathe is fun for sure.
Gets a bit tedious at times making 2x or 4x of the same thing though.

Making stuff like the pullstart handle is the most fun.
Just freehand it and see how it turns out.



Cheers mate, yeah keeping it simple.

No suspension, just motor and 4 wheels.
Works fine on the beach.

Lars from Norway

Those hacksaws are very handy! I used one like that for about 4 hours ago I always end up with straight cuts

Lars from Norway

Those hacksaws are very handy! I used one like that for about 4 hours ago I always end up with straight cuts by using it

Dirty_Vinylpusher

Ok some more pics.

Been tinkering with engine mounts and stuff.

krakkah

I like your work DVP [8D]

Have you seen these? http://www.ebay.com.au/sch/i.html?_f...All-Categories

These ones specifically http://www.ebay.com.au/itm/Mini-Pock...item27a5f56540

they're a 1:5 ratio. I have one I will be using on mine and seem to be fairly rugged. You can get smaller20H (1/4 inch chain) sprockets pretty easy too.

Dirty_Vinylpusher

Cheers Krakkah.
I try to have fun with it and not take it too seriously

The building is the most fun part for me.
Scavenging materials at the scrapyard and figuring out a way to make it work.
I'm not trying to break any land speed records or build something that's bigger/better/faster than a "real" RC car.
Just something that moves.


I've seen those reduction boxes.
They should do the trick.
For my bigger project though with the pocketbike motor, I'm gonna start with the original sprocket setup and see how that works.
Should be ok, I mean it's designed to pull a bike and a grown man (or woman), so....

krakkah

Yeh lol I just wish I had better access to things like old gearboxes and used parts. Half the fun is bolting something together and seeing how it performs without really getting too nitty gritty, as you know. Ive seen some of your videos on youtube and you have come up with some great machines

I have a background in engineering, so there is an expectation, somewhat, of people around me to make something half decent, especially since im spending money lol

I have a pitbike with a 125cc engine with a 4 speed sitting there, its runs. That will be the next project if my current thing happens anytime soon. I can do 80kmh on that and im not exactly a small person just needs reverse. I hate the idea of not having reverse. If I hit a child at 200metres out I dont want to walk over there to help, just plonk in reverse and carry on lol......Im a tad evil hehe

Dirty_Vinylpusher

I was toying with the idea of using the driveline of an old outboard motor to get reverse.
A mate brought one over to my shed to tinker with and he showed me how the reverse works.
If I understood it correctly it should be possible to switch between forward/reverse using a large servo.

I never really looked in to it any further though.

Another idea that's been thrown around is a small electric motor and a one-way bearing setup on the rear axle.

Lars from Norway

I have tried the one way bearing-trick - to no avail. When turning the wheels forwards (or driving) the bearing will actually drag the electric motor around. It is hard to explain, but i have tried to make a reverse like this on my FG and it just wouldn't work now matter what i did. Sorry

Dirty_Vinylpusher

Arrrrrr of course!
It'd be the same as rolling a bicycle backwards....

The one way bearing would be engaging when the car rolls forward.
Makes perfect sense.


Ah well.
Back to the drawingboard

Lars from Norway

Correct! I found out this the hard way, after spending almost a whole day where i used to work borrowing their lathe making parts, home to mount it and *face palm*. Make that double face palm!

Dirty_Vinylpusher

Ah well, Lars, that's how we learn what works and what doesn't.



Right, been tinkering a bit again.

Of course I'd stuffed up the front end and the wheels had different caster.
Luckily I've got a life experience of making mistakes and correcting them so I cut the front bar in half, made an insert and now it can be adjusted to the correct position before being secured.




Next I made a couple of flat spots on the hubs to mount the bracket to which the steering rods will attach.








Making the brackets.






Sponsored by Stanley



There's 2 bolt holes by the way.



That's all for now.
Still lots of problems to solve with the steering.

Dirty_Vinylpusher

Ok some updates and pictures

Front hubs are on.








Now trying to get my head around the steering.
I'm trying a setup with individual steering rods connected to a turning centre bit... kinda steering pivot... scenario....
(Anyone with the correct terminology feel free to step in here.... )




So.




Making the centre turning bit thing for the steering.




After lots of drilling, hacksawing and filing....










Bearing holder.











And all put together.....


















Thinking of setting the servo up something like this.

Lars from Norway

Just gotta like this

Dirty_Vinylpusher

It's going pretty good so far.
No major problems.

Dirty_Vinylpusher

Well after lots of fiddling around with the steering I think it's finally working.
Had to redo the brackets coming off the hubs again as they were a bit too short and the servo struggled to turn the wheels all the way.

Also made a backing plate to strengthen the servo horn.












All hooked up(-ish)

Dirty_Vinylpusher

I've had a bit of shed time the past few days and have been going over the chassis.
Replaced all the nuts with nylock nuts and also pop riveted most of the side bracing.

Added some more bracing down the middle.



It's pretty strong now.





















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