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Old 01-14-2010, 09:44 PM
  #51  
Dirty_Vinylpusher
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Default RE: New Project

Haha you know I laughed all the way back to the shed after crashing it!
I was just happy that it went as good as it did to be honest.
After all it was just a test to see how the motor performed, and while it was running really badly it was still planty of power there.
And this setup was geared at 5:1!!!!!!



I remember watching Robot Wars years ago and see these guys bring in their robots they'd spent months working on, only to have them annihilated by the house robots straight away, and they were laughing their heads off and cheering and said it was all worth it.
Now I understand why they acted like that.
It's not about the driving.
It's about building and creating and getting 5 minutes of fun out of it and then build it again but bigger better and stronger.







Old 01-14-2010, 10:10 PM
  #52  
ttr125fan09
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Default RE: New Project

lol, thats true, i remember my first rc car, a 1/8th duratrax raze, horribly, the first day i took it out, after break in, i was doing speed runs on my road, and the steering linkage snapped, somehow......, but anyways it ran right into a mailbox, ripping the front end off, all i did was laugh my head off

but good work on the engine cradle sofar, looks cool
Old 01-21-2010, 10:53 PM
  #53  
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Default RE: New Project

Got a bit more done on the engine cradle but as always I've been distracted by other things.....
Scored a bent shaft Stihl FS45 weedwacker really cheap (of course) which I'm converting to straight shaft with proper handles and harness.

Tell you what though, these Stihl motors are pretty solid, and have plenty of bolts which would be great for....oh I dunno......mounting to a chassis....
Maybe......

[:@]NO!
[:@]
Must.....resist........urge........

This will be used as a weedwacker and nothing else.




So I should be back on track with working on the car soon.
I got my diff from DC2man the other dayl so been tinkering a bit with mounting a pocketbike sprocket on to it and it looks like it's gonna work really well.
Once the cradle is finished I'm gonna start pulling my hair out trying to decide how to do the rear swingarm setup.

So much for this being a simple project.


Also got given an old pushbike the other day.
Maybe lengthen the front forks, put some apehangers and a chainsaw motor on that......
Yea!
Pushbike chopper!

Then there's plenty to be done in the backyard as well.
Gotta pour a concrete slab to put another shed up, lay some pavers, finish building a gate.

Not to mention replacing the doors on my car, fixing up the rust and respraying it.

Oh and getting up on the roof and screwing down a couple of roof sheets that are a bit loose....





Ah well.


Think I'll just go out to the shed, have a beer and look at my motors for a bit.


All that other stuff can wait.






Old 01-22-2010, 12:06 AM
  #54  
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Default RE: New Project

Some pics of the cradle.

































Old 01-22-2010, 07:49 AM
  #55  
sam123
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Default RE: New Project

Very nice man, very nice.

That chainsaw powered chopper your thinking of building sounds interesting too
Old 01-22-2010, 08:27 AM
  #56  
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Default RE: New Project

ORIGINAL: sam123
Very nice man, very nice.
Cheers Sam!
Bloody tricky to mount this motor as the case is all plasticky and no right angles to work with.
Just gotta make it up as I go along.
It's not perfect but I think it should work.




ORIGINAL: sam123


That chainsaw powered chopper your thinking of building sounds interesting too

Well I'm not actually thinking of building it as such.....
......although I do have the handlebars I made for that scooter project, which never happened as I'm now using that motor for this build.....


.....Mmmm yeah that scooter....still sitting in the driveway looking pretty sad and lonely....


Maybe chainsaw motor on THAT......[sm=lol.gif]



Oh and then there's that pocketbike motor.
Must do something with that as well...........

The possibilities are endless.



Old 01-22-2010, 11:28 AM
  #57  
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Default RE: New Project

You have too many heads to think with and too much ideas!
Old 01-22-2010, 08:42 PM
  #58  
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Default RE: New Project

Only one head full of little ideas running around.


Below is a picure of what the inside of my brain looks like






























































































































Old 01-23-2010, 11:35 AM
  #59  
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Default RE: New Project


ORIGINAL: Dirty_Vinylpusher

Below is a picure of what the inside of my brain looks like
Yeah,just what i thought!
Old 01-23-2010, 08:51 PM
  #60  
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Default RE: New Project


ORIGINAL: Dirty_Vinylpusher

Some pics of the cradle.


The shape of it looks a bit like atube frame chainsaw powered chopper It will be nice that the engine is modular, separated from the frame, easier to make adjustments and take apart the car. It's funny how those chainsaw engines are designed, with the plastic molding being integral part of the engine.

Can't wait to see your suspension setup!! With a swingarm type suspension, with a chain, is it possible to have some twist ? Like compressing one wheel more then the other? I would guess the chaing can't handle too much twist, but after all most 2WD ATVs use this setup so it should work nicely.

Would there be a way to use angle grinders gears to transmit power with a driveshaft ? If the driveshaft in the center is aligned with the 2 swingarms it could follow the movement of the suspension. But I see lots of work to put one set of angled gears on each side of this driveshaft... Probably better to use a chain and design the swingarm so it does not allow too much twist.

Fred
Old 01-23-2010, 10:45 PM
  #61  
ttr125fan09
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Default RE: New Project

yay updates!!!!
Old 01-23-2010, 11:15 PM
  #62  
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Default RE: New Project

If anything I'd mount the engine on the rear swingarm.
Then there's no problem with chain slack/twist.


I'd have to make the car a bit longer though otherwise half the chassis will be the swingarm.



Old 01-24-2010, 12:02 AM
  #63  
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If you can make the engine very close to the pivot point it could help reduce the effect of not having the engine on the suspended part (the engine to close to the wheel would be a pretty large unsprung weight). What I mean basically is, the engine being the most heavy part of the car, having it mounted where it is not really suspended by the suspension would not be ideal I think

I didntthink about in details so I dont know how it would work, but ifyou make the swingarm extend a little further of the suspension axis, and hold the engine just over it (the suspension axis) maybe it would have almost the same effect as having the engine mounted on the chassis?

Here is a quick mspaint drawing I dont have autocad on this computer lol



Orange is your engine blue the chassis and red the swingarm.

Brown is your engine support, bolted to the swingarm. Green is the swing arm pivot point. You could play with the engine position (forward-backward) and see what gives the best behaviour when driving it.

Frederik
Old 01-24-2010, 01:29 AM
  #64  
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Default RE: New Project

Yeah man that's pretty much what I had in mind.


To begin with I'll probably just do a "straight" swingarm without twist movement, and then we'll see what happens next.
I like the setup on that Mammuth truck though and might try that later, or on a larger build.



Old 01-24-2010, 10:43 AM
  #65  
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Default RE: New Project

Hahaha yeah I forgot you have so much in your mind (those small green aliens) that you have already thought about the design ! Keep us updated on your progess!

Fred

Old 01-24-2010, 06:36 PM
  #66  
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Default RE: New Project

All good Fred - any more ideas throw them this way.
All suggestions and tips welcome!



The rain is pouring down here today so no work for me.
Perfect for spending the day in the shed though!

Hoping to at least get the cradle finished today and maybe put the engine back together as well.
Then I might start measuring up for the frame and cut some steel and lay it all out on the bench and see what the aliens think about it.

Unless something else pops up of course....





Old 01-25-2010, 01:35 AM
  #67  
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Default RE: New Project

Ok I only got sidetracked briefly with another motor there for a bit, but decided to put it to the side and work on this car instead.


Got hold of some struts today, and started making the arms for the front suspension.
So far so good.
I'll use the ones I made today for the bottom and will figure out a way to make the top ones adjustable for camber.

Finished the cradle and it seems pretty solid.


Am thinking of a way to convert the struts to shock absorbers.
ttrfan - you mentioned something about this earlier.
What were your thoughts on this?

Resize them, fill with oil and fit springs?




























































Old 01-25-2010, 01:55 AM
  #68  
troppo
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Default RE: New Project

Looking good mate....
As for the strut to shock conversion, look into QSPSB/stoneyberk `s build on QSL, he did the same thing using (i think) pocket bike fork springs around the strut.
However you do it its going to be interesting, might have to call it the "Tip Rat"
Old 01-25-2010, 05:02 AM
  #69  
Dirty_Vinylpusher
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Default RE: New Project

Yeah Stoney's shocks are awesome.
His car is a bit heavier though so I will need to source some lighter gague springs.





Old 01-25-2010, 05:05 AM
  #70  
troppo
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Well, your a pretty handy bloke.
Try a google search for spring making, i know theres a heap of info out there. Be an extra feather in your cap to say 'even the springs are home made'
Old 01-25-2010, 05:52 AM
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Default RE: New Project

I'm more in to pulling things apart and using the bits rather than fabricating things from scratch though.
I'm sure I'll come across a device/machine/apparatus/box containing a set of suitable springs before long.


Most likely when I least expect it.






Old 01-25-2010, 07:41 AM
  #72  
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Default RE: New Project

Haha cool those arms look very nice!

Do youplanto put 2 ball joints on the other 2 ends of each arm? It's not really required I believe, you could weld a small tab with a hole on the chassis and another one on the arm. Or you can put joints all around for more hightechness

I like the progress!

Fred
Old 01-25-2010, 07:53 AM
  #73  
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ORIGINAL: Dirty_Vinylpusher

I'm more in to pulling things apart and using the bits rather than fabricating things from scratch though.
I'm sure I'll come across a device/machine/apparatus/box containing a set of suitable springs before long.


Most likely when I least expect it.






Heres a thought, i dont know how they work but what about the rams used for fly screen door closers.
Could be interesting to look into how they work
Old 01-25-2010, 10:45 AM
  #74  
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Default RE: New Project

My spring are for a manual garage door... I would think a screen door spring would work fine for your application. do a search on fleabay for ''springs'' and see what yaa come up with..
Old 01-25-2010, 03:41 PM
  #75  
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Default RE: New Project

Do you plan to put 2 ball joints on the other 2 ends of each arm? It's not really required I believe, you could weld a small tab with a hole on the chassis and another one on the arm.
At the moment I don't have enough ball joints to do that but I might get some more during the week.
Suppose it would be cool to have them all around.









what about the rams used for fly screen door closers
As far as I know they don't have springs in them?
But I could be wrong.














do a search on fleabay for ''springs'' and see what yaa come up with..
Anything from slinky's to spring dresses











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