Magnet Stacking Power?

[WarriorFish]

I'm familiar enough with using magnets but there's one thing I've not done yet and that is stacking magnets to create stronger bonds. I know it works of course, but I'm wondering how much?

For context, I'm magnetising the snapping claws of my Keeper of Secrets because I don't fancy chartering a freighter for each game and while the join itself is straight forward enough it is a rather long arm and is almost horizontal:

I currently have a 3x1mm N42 neodymium magnet in the shoulder and arm and the strength of their pull is good maybe enough... I would prefer that it was definitely strong enough so I won't have to worry about the arm getting knocked off during games. I could potentially rework the arm to put two of the 3x1mm magnets in on top of each other but what sort of improvement would I see?

[armarnis]

Probably less improvement than a 3x1 at n52

[WarriorFish]

Luckily I have managed to find a few 3x2mm magnets I didn't know I still had, but I have no idea what strength they are unfortunately. If I replaced the arm 3x1mm with one of these then even if it is another N42 it should make enough difference?

[Fajita Fan]

You can stack magnets but you have remember to glue them together. 

 

https://www.kjmagnetics.com/blog.asp?p=doubled-forces

 

This is where I order my fancier N52 magnets from (I get cheap magnets for my bases off Amazon) and they discuss this.  Really neat site btw.

[WarriorFish]

Thanks Fajita, that is a very useful link! It seems I was mostly there with my understanding so it all makes sense I will try replacing the arm magnet when I'm next ready to do battle with the kit and of course report back here

[Fajita Fan]

I love these little guys, they're great for marine arms and tank barrels. 

https://www.kjmagnetics.com/proddetail.asp?prod=D201-N52

[Xenith]

Pin to keep the arm in the right position and single magnet to hold it. I personally wouldn't rely on stacking small magnets for something like a long arm. Surface area of the magnet is what counts when it comes to shear-resistance. My long stack of 3mm magnets still breaks easily with minimal force. 

Edited April 28, 2020 by Xenith

[WarriorFish]

Later than planned as I sliced my thumb when I attempted to return to try the new magnet, but as promised the results of using 3x2mm:

Nice and secure Thanks for the help everyone, hope this can help someone else too :)

[Lord Ragnarok]

This is timely for me as I’m magnetizing leviathan dread storm cannon arms and they are a bit weak. I’ll try n52’s (if I can dig them out!)

[Fajita Fan]

You may only need to replace a magnet on one side if you get N52s, they're stroooooong for their size!