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Magnetic Trains

DIY magnetic train set

Magnetic trains are a fun hobby for all ages. This month, we'll set out to create our own magnetic train set, then take it one step further and turn it into a MagLev train set!






Testing

First, we purchased some plain, non-magnetic trains online. This will allow for complete customization and allow us to experiment with different options. 

Our first thought was to use some countersunk magnets, like our R622CS-P. The countersunk hole makes it quick and easy to attach these magnets to any object. The R622CS-P have a pull force of 3.5 lb, which is plenty strong to hold, but not impossible to separate. When installed, they had a good, firm hold, but they didn't allow the trains to turn. 

Then we put a NSB6 steel ball between them. The hold was still good, and now the trains can turn, but they don't quite have the classic magnetic train look. 

A R622CS-P pair provides a firm hold
A R622CS-P pair with a NSB6 steel ball in between

While we were experimenting, one of our customers emailed us, wanting to make some custom magnetic trains himself...he had the awesome idea of using some upholstery tacks with magnets set underneath the head. We tried this out, and it was a clear winner! Using our R621 magnets, this setup has a firm enough hold, allows for turning, and has that classic train look. Thanks to our customer for the idea! 

Two upholstery tacks with R621 under the head
This setup works well and looks authentic!

Materials and Build

The materials are simple, some wooden trains, 7/16" diameter x 1/2" long upholstery tacks, and some R621 magnets. Check out the video below to see the build in action!



We thought we'd be able to push the tacks right into the wood, but it wasn't consistently successful. So we pre-drilled a small hole on both the front and back of each train. 

Next, we marked the north pole of each R621 magnet. We made two piles of magnetic upholstery tacks - one pile had the north pole facing the head, one had the north pole facing the pin. We'll use one pile for the rear of the train, and one for the front, that way all of the trains will connect, no matter what order they are in.

Using our Pole ID to identify the north pole
This tack has the south pole facing out

Then, we just had to push the magnetic tack assemblies into the trains and we were done. We had a quick and effective magnetic train set. We found that it took just over 0.5 lb of force to pull two trains apart. That's a little more than a traditional magnetic train, but still weak enough to remove easily. For larger trains, you might step up to the R622 or R822

Pushing the tacks was much easier with a pre-drilled hole

Also, with our setup, the trains couldn't make a really tight turn. There isn't enough room between the trains to do so. Using a thicker magnet would allow for tighter turns. We're quite pleased with the results! We're magnet nerds, not artists, so we didn't attempt to paint the trains, but be sure to send us pictures of your magnetic trains!






Make it better

How could we make this project, better, cooler, and more attractive (more like repelling)? Add more magnets! We turned some of these trains into a MagLev train set! In our old Maglev Trains article, we go into more detail about MagLev trains and how to get stable levitation. Check out that article for more information. 

Materials and Build for the MagLev track

Some wood, plexiglass, BY041 and BX041 magnets, some steel, and wooden trains. 

First, we cut the wheels off of the magnetic trains, we won't be needing those anymore! Next, we glued some BX041 to the bottom of the train, making sure that the same pole was facing out on all of the magnets. We decided to use two smaller tracks, one on either side, rather than a single row of magnets in the middle of the train. From previous experience, we know that using two tracks like this has better stability. 

Two rows of BY041 on the bottom track, stuck to a steel strip
Two rows of BX041 on the trains. We doubled them up for added strength.

Then, we cut some grooves into a piece of wood to accept the plexiglass (which will hold the trains in place), and mounted some steel in the middle. We stuck some BY041 magnets on the steel, again making sure that the same pole of each magnet was facing up. Like poles repel, which is what we want here! We used the steel, rather than gluing, to make it quicker and easier to move and change the magnets if needed.

Tips and Tricks

Repelling magnets are highly unstable, as we mention in our original Maglev Trains article and in our Diamagnetism and Levitation article. Repelling magnets won't stay repelling by themselves, some outside force needs to hold them there. In our design, the plexiglass sides keep the trains above the track, stopping them from flipping around or falling off. 

The plexiglass helps hold the trains above the track
Using the same tack+magnet assembly, you can have as many as your track can hold!

We also found the levitation to be a bit more stable when the two tracks were slightly offset. We made the bottom track slightly narrower than the magnet tracks on the train. 

Making a MagLev Train set really steps up the magnetic train game! You can also do cool things with it. One of our engineers can recall having to make a MagLev train in grade school, that was powered by a CO2 cartridge. The goal was to make a train that could protect the passenger when the train slammed into a wall...the passenger being an egg. 

It doesn't take much force to move the trains along the track, so there could be some fun ways of getting the train to zoom around the track!












Some older posts you might enjoy...


Magnet Fishing II

Brand new magnet fishing magnets!

Rocks and Crystals

Which magnets could work to hold decorative rocks and crystals to a fridge?

Magnetic Gears

Using magnets to create a gear assembly

Dent Removal

Magnets can be a great way to remove dents from malleable surfaces, like brass. We did some experimenting to find out when this is possible, and what you can use.

Removable Access Panel

One great thing about magnets is that they aren't as permanent as screws or adhesives. You can move or remove them relatively easily if you need to. This makes them great hanging up things you want to be able to remove, like access panels. But what's the right strength?

This month we'll share our experiments and recommendations for hanging up removable access panels.