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I haven't used these yet. Before buying some, can I just ask what size I need to give sufficient strength? I don't really want to buy tiny 1mm x 1mm neodium ones and find they won't hold guns on.

I used some on my assault terminators so I could switch between thunderhammer and lightning claw arms and they work wonderfully.  The ones I used are 3mmx1.5mm.  I even used them on my terminator chaplain so I could switch between the metal arms and lightning claw.  They hold the metal arms on just as well as the plastics.  Dunno what you had in mind for holding power though.

Make sure you put them in so the magnets stick together instead of pushing each other away....  I never felt like such a moron until I did that.

I've used very tiny magnets, about 2 or 3 mm cubes for my predator sponsons, and they have done nicely. I've never used them for Terminators, but I would think they would do just as well.

I also use 1/4" inch circular magnets on my land speeders for customized weapons choices and flight stands. They work very well. They don't let go. Usually what I find happens is that the magnet will snap off the expoxy that holds it to the flight base before a weapon will fall off.   I've even used them on Emperor Class battleships for BFG, and that is a fair chunk of metal to hold on the flight stand.

Even the tiny magnets are useful. I use the smallest available, 1.5mm x1mm disks. This joins smaller pieces such as swappable ams on its own, for larger pieces it stabilises. My favourite is to pin and magnetise. The pin takes the weight, the magnet hold it together, you can have swappable Falcon armament this way even with the smallest magnets.

I don't use larger magnets because they become too bulky and harder to fit into the models. My Hammerhead main armament is pinned and swappable because it mounts vertically. My Flacon secondary armament is pinned and magnetised because it mounts horizontally. The small magnet wouldnt not adequately hold a shuricannon to a falcon, but it doesnt need to, with a simple pin to hold the weight the weapons are very secure.

Keep magnets away from kids. If a child swallows magnets they are in real trouble.

I uses a set of rare earth mags on my cannoness in two places:

3mm*1.5MM on the jetpack (I added warmaster eagle wings to it) for ease of transportation.

and 1mm*1mm on the hand weapon s and hand to allow for a variety of weapons.

I used the same 1mm on one of my squad leaders to enable a variety of weapons for my special weapons squad.

don't drill too deep for the magnet depth. too much and you'll have to use filler to bring the mag back to the proper depth.

I, too, use the 3mm*1.5mm available from Magcraft. As was mentioned before, a pin and magnet arrangement, where some portion of the attached part penetrates the model or visa-versa works wonderfully.

I am currently using this arrangement to allow swappable arms on my Nomad Mercenary Warjack. I can replace the sword arm and open hand for a cannon and club and viola! its now a Mule.

I recommend buying the smaller size simply because those magnets have the most utility. The warjack arm could have used a larger magnet but that would have meant I would have needed to buy two different sizes of magnets and as it is, I will never run out of my current stock.

Agreed.

I've built 2 fire prisms recently and on the plastic arm from the turret to the prism (major front heavy) I used a combination of drilling in 2 3x1mm magnets and 1 1.5x1mm magent for each connection and a pin in the the facing half of the prism cannon. Once you hacve the magnets in place in the gun, add an extra magnet to each one you've seated. Put a blob of paint on it then carefully position it on to the connecting side of plastic.

This gives you a template to drill into to seat the corresponding magnet.

Do it in reverse and you get the perfect seating on you pulse laser to make it a falcon.

I you want to do it on the charger for the prism side (also front heavy). I've done it by creating a long horizantal oval of greenstuff around the plastic spiggot. I've then drilled out the space for 2 3x1mm magnets in the greenstuff and used the same methoud of blobs of paint to match them up to the seating of magnets on the charger/starcannon/scatterlaser/shuriken cannon.

I also seat the central plastic connecter into a blob of greenstuff in the base of the turret at the line for the teeth of the connecting rod. Then glued in place with superglue. This means that the gun (prism is a front heavy b*****d) wont give you too muc drink syndrome.

The gun can't move up or down but becomes a lot more stable.

If you buy a prism kit you can build a Prism/facon with a bit of investment of time and magnets.

Once I figure out how to post picturers I'll post them.

I'm contemplating doing something similar with my Tau to convert between hammerhead and devilfish, only I'm not entirely sure how much magnet I need...

As you know, the chin turret burst cannon pivots on trunions inside the chin turret, fairly simple, build up a backing inside the chin turret and mount magnets, drill out the trunions and mount magnets, I can fit up to 1/8" dia magnets in there, though that's almost certainly overkill.

The real question here is, will the outlined setup keep the cannon under control, or do I need to add more magnets at the back of the burst cannon?

If you are looking to just keep a weapon attached but free to swivle, one magnet point will do the job admirably. however if you do not want swivle, you are either going to have to use a pin, two+ magnet points, or two rectangular magnets.

I make heavy use of magnets, with the bottom of every base having some to attach to my carrying case bottom. All my tanks have magnetized accessories (storm bolters, smoke launchers, dozer blades etc.) for easy swap outs, and my Immolators have one magnet in each gun to make swapping options easy. My Exorcists also use 3 4lb strength magnets to hold the big pipe organ launchers on.

I use a variety of sizes from 1/8th inch or so to 1/4 inch, depending on the use. Mostly the little ones are for accessories and gun swaps, the bigger ones for bases on heavier models. K&J Magnetics has a lot of really good variety in this sense, with disc, rectangle, rod and ball magnets of various sizes and strengths. Periodically I loot their overstock section to find random sizes for easy applications, like rectangular magnets for bases.

I was eyeballing their (K&J) site for an order anyways, glad to hear good things about them. I'll probably wind up going with round magnets just for ease of drilling out holes for them, and I can put an attach point at the back without issue, though I'll try it without first to see if the gun balances on its own.

Yea, I can't recommend K&J enough. The guy even sent me an assortment of freebies after I ordered some 50$ of magnets in preperation for my marine project. Good delivery time and a good selection, and good prices (though honestly I didn't shop around too much, maybe 3 other sites.)