Instructables
Picture of How to make a ball bearing rollercoaster


Scott had always wanted to make some sort of ball bearing rollercoaster and we thought we'd post up the results of his first testing and building sessions.

The idea was to make track for ball bearings (or similar) out of something that was fairly quick and easy to work.

Scott found that mains cable copper wire was perfect for this, go to the next step to see a list of ingredients for this project and get cracking.

It is assumed that you have access to a workbench / desk and that you can use tools like soldering iron, wire cutters and so on.
 
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Step 1: Ingredients

A list of things you'll need for this project:

- Ball bearings (we used 5mm)

- Battery drill/screwdriver (ours is the cannibalised motor from an old one)

- Small drill bits (that match the diameter of the wire you will be using)

- Mains wire (we ended up getting a big roll but you can use the grey sort, often easy to get from skips or lying around. You'll want the stuff that is quite stiff, we found 2.5mm squared core to be best)

- Pliers / wire cutters

- Soldering iron + solder (we ended up modifying our soldering iron tip for best soldering)

- Small motor (ours is from and old zoom lens, you could maybe take apart an old CD drive to get the tray motor or similar - post up what you use)

- Spirit level/s

- Chipboard / ply board  (for jig and for mounting the rollercoaster)

- Matches (for jig)

- Glue (we used hot melt glue gun and some wood glue)

- Sharp knife (Stanley or similar)

Once you have this lot, you can get making!
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hans.pistor11 days ago
How did you get the separate pieces of track to align with one another?
rjacobse2 years ago
Have you tried one with marbles instead of ball bearings?
What would you suggest using instead of the wire you used?
aessam13 years ago
Really amazing
i hope to make one when i have some free time
Emara3 years ago
Haha..Thats really cool
tzq33tdq3 years ago
this is AWESOME!!!
I was just wondering would it be better if I used 10 gauge copper wire instead from a website?
hi! We are doing your project for physics and we saw that you used two motors. Do you have a different design that includes only one motor and please show us at different angles. we love your project the g mail is richardhtet98@gmail.com. and we, cant solder copper.
JamJarCollective (author)  richardhtet983 years ago
Hi Richard,
thank you for your comment. We do have a new design using only one motor - we haven't quite yet put an instructable together for this but can share some images:

http://twitpic.com/4846hm

http://www.flickr.com/photos/nottinghack/5520954871/sizes/l/in/photostream/

http://www.flickr.com/photos/nottinghack/5520943595/sizes/l/in/photostream/

The new lifter works by forcing the ball bearings vertically up a 'cage' - rather than using the 'archimedes screw' type technique.

We can't get any more photographs yet as the sculpture is away on holiday but once we get it back I'll try to get some more pictures of the new ball lifter detail.

we would suggest that if you can't solder copper then this project may be a little too much of a challenge. Have you tried using flux and/or a more powerful soldering iron?

Good luck + let us know how you get on.
sfong4 years ago
Love this.  I decided to build one with my son.  The straighten wire technique is wonderful. 

I have tried to solder the wires, and have had no luck.  My soldering iron is electric.  Do I need to use a gas like butane?  Can you give more detail on your equipment and methods?
JamJarCollective (author)  sfong3 years ago
You could try using fluz to get the heat to transfer more effectively. We have had success with both gas + electric soldering irons. You may need to try a higher powered one (we now use a 40w electric iron) - although we have burned out a number of them through heavy use.
I use butane. and like willstyles said, use solder. it helps a lot.

if you want to get a torch for cheap, dealextreme's a good website. their stuff's a little cheap (my ignition system broke and I have to use a lighter now), but the torches seem to work fine.
Have you tried using soldering paste on the joints? It really aids in the trasfer of heat from the gun to the copper.
Amazing! So incredibly cool!!!!!! I'm following your Instructables. One zillion % !!!!
amazing, will someone tell me if there is any other method of joining the wires together besides soldering? maybe if i used hot glue and then scraped off any excess glue that might get in the way of the ball bearing?
snox4 years ago
I used some Neodymium magnet balls to make some nice tricks upside down and holding some unatural curves. pretty nice all inspired from this instructable
day-weed4 years ago
very very very very very welllll done! i gotta try this! gotta question though. how do you join two pieces of track (e.g. a loop and a straight track) together or is it one continuous wire?
would 1/8" (or really, any other diameter)soft copper wire work, i found it here......http://www.rjleahy.com/store/wire/cwi.htm
would 1/8" (or really, any other diameter)soft copper wire work, i found it http://www.rjleahy.com/store/wire/cwi.htm
to make a loop or jump, just make a straight piece of track, then find something round and stiff and the size of the required loop and bend the track around that. i used a can of beans and it worked perfectly. hope this helps!!
drats6664 years ago
you could have added more wire, connecting the wrapped around wire of the shaft. this would give the ball a resting place as it sits for the ride, otherwise the ball may actually slide backwards. An alternative to the above is to have the rotating shaft with the above mentioned rests. and instead of the rails shown above, create a spiraling rail for the ball to ride along as it glides up the shaft. you can give these rails support by adding rails to them, idk it seems to add more of a endless roller coaster effect for me but hey its your project do whatever you feel comfortable.
kenexinator4 years ago
wait a second how big is the one you made????
JamJarCollective (author)  kenexinator4 years ago
It's around 175mm x 300mm  wide/long and 250mm high - not as big as some people expect from the video! See the 6v battery for some reference.
 thanks!
nolte9194 years ago
Where do you get your ball bearings?
sfong nolte9194 years ago
I have found the ball bearings at places that sell ammo for sling shots.  Very cheap for bunches.
JamJarCollective (author)  nolte9194 years ago
 The ball bearings were just some of the stuff we had lying around in our workshop space. Sorry we can't be any more specific - we've had them for ages... Try asking around in some hardware stores or motor spares places..
we used the balls out of our magnetstix set they worked well! as its only the stix that are magnetic the balls are just average sized ball bearings
I usually get mine for free from the scrap piles at transmission shops or mechanics.Ask First,lol.If you want BIG bearings,try truck stops or machinery rebuilders.Most are happy to give them away,you usually just have to grind through the outer race.Hope this helps!
sfong4 years ago
I have tried to solder the wires, and have had no luck.  My soldering iron is electric.  Do I need to use a gas like butane?  Can you give more detail on your equipment and methods?
sfong sfong4 years ago
Thanks for the responses.  BTW:  I love the method for straightening the 12 gauge copper.  It works amazingly well.  It also seems to stiffen the copper.  I just used a vice to clamp one end in, then mounted the drill to the other end.
There needs to be a lot of heat for this to work well, the author used a modified soldering iron to distribute the heat over the track spacer. Its possible that your soldering iron is too low of a wattage. Im just about finished with mine and i can tell you that a butane hobby torch and alligator clips is the way to go. Use a little soldering flux to paint the joint before you apply heat. It will help wick the solder in between the wires. It takes practice. i almost gave up on mine as being a lost cause but after i was able to walk away from it for little while i was able to finish it off and its looking really excellent. just finishing the ball lifter. Also i used a piece of shrink tubing to connect the rod to the motor, i found it easier for me then rapping the wire around the motors axial. stick with it.  
JamJarCollective (author)  maxwelltub4 years ago
 Great tips, thanks for helping others out.

Also well done for sticking it out, always nice to have a few half done things lying about to be able to crack on with!

Nice idea for the shrink tube / motor connection. it would be cool to see some pictures of your ball run, post them up or send them over if you're up for it.
JamJarCollective (author)  sfong4 years ago
 HI there, a good hot iron is the key - 40w recommended for an electric type. The modified (filed down) tip makes quite a difference as there is more surface area of hot iron touching the copper. 

Also try to apply quite a bit of pressure with the soldering iron - pressing hard should help to transfer the heat.

As maxwelltub says flux can also help although we didn't use any - just flux cored solder.

Good luck and stick with it! Let us know how you get on.
brichins4 years ago
I have every intention of building one of these - "someday" when I have spare time...

I'd like to add a magnetic transfer mechanism that picks the ball off one track and sets it on another; probably use a rotating arm that goes just over the top of the ball at a stopped postition (or maybe in the middle of a track, so it's random) and then past a blockade that scrapes the ball off while it's above the other track. Any thoughts on that, or other mechanisms to add?
JamJarCollective (author)  brichins4 years ago
 Scott tried a magnetic lifter:

Using a motor with long rubber belt from an old computer printer with two very small neodymium magnets stuck onto the outside of the belt at halfway intervals.

One problem that had to be solved was a mechanism that prevented more than one ball bearing stopping in the pickup point. It was possible for the magnet to pick up multiple balls fouling the lifting.

Also when introducing magnets into the track we found that the ball bearings got slightly magnetised, affecting how they rolled on the track. That's the reason for the shaft lifters. 

Let us know how you get on if you try the magnets, you've got some cool ideas.
lkik4 years ago
how do you join your 2 bits of track together i cant seem to make smoove joints

JamJarCollective (author)  lkik4 years ago
Each track joint is made as a butt joint - the ends are offered up to each other and soldered.

First tip is to use side cutters with one flat edge - meaning a cutting side with no bevel to it. This gives you better flat ends to your track sections. When cutting like this, sometimes the copper won't cut perfectly. Try twisting the wire off just after cutting, rather than pulling apart to reduce the shearing.

Next, when joining two track sections:

Roughly solder one track side together with a quick solder join to hold it the two pieces together.

Next, line up the other track as perfectly as possible, using the other solder join as a lever / extra support to hold the second (and better) solder join.

Once you have a decent join, you can touch your soldering iron on the first temporary join and reposition, using the better join as a guide.

This technique should allow you to get usable solder joins. If you are struggling after a good few attempts you can try overlapping the track joins. This will be a bit easier to solder and you can always try the butt joins later. Soldering is rewarded by practice and patience :)

Good luck and let us know how you get on.
LankyDuke4 years ago
Can you provide any more info on the wire used? Does it have any markings on the outer sheath?

All the wire I've across is too weak, or multi-stranded.

I did a test to see if I could do this with a simple coat-hanger, but the solder wouldn't adhere to the metal :P
My local hardware store sells something called "grounding wire" which is relatively strong, the perfect guage, and solders very easily (copper)
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