Press fitting neodymium magnets`
Press fitting neodymium magnets`
(OP)
Hello all,
I got a couple of projects that would call for press fitting some neodymium magnets into anodized aluminium. I've talked to K & J magnetics and they obviously don't recommend it. But I see press fit magnets everywhere, specially anodized aluminium. They're almost a given on any aluminium pocket flashlight. AND I found this supplier (Industrial Magnet inc.) that has magnet assems with brass sleeves.
Am I missing some magical technique that allows this? I know that the tolerances on the nickle plated magnets are yet to be desirable, let alone the brittle nature of the magnets. The hardening of the anodized aluminium can't help either.
Can anyone help me out here?
I got a couple of projects that would call for press fitting some neodymium magnets into anodized aluminium. I've talked to K & J magnetics and they obviously don't recommend it. But I see press fit magnets everywhere, specially anodized aluminium. They're almost a given on any aluminium pocket flashlight. AND I found this supplier (Industrial Magnet inc.) that has magnet assems with brass sleeves.
Am I missing some magical technique that allows this? I know that the tolerances on the nickle plated magnets are yet to be desirable, let alone the brittle nature of the magnets. The hardening of the anodized aluminium can't help either.
Can anyone help me out here?
RE: Press fitting neodymium magnets`
Then of course there is the option to use adhesives.
RE: Press fitting neodymium magnets`
I've already read though this thread:
http://www.eng-tips.com/viewthread.cfm?qid=371826
And the adhesives suggested in that post would be great for my other application but I need to think of cost on the manufacturing side when this goes to production, not to mention the quality control that goes into goopy adhesives.
RE: Press fitting neodymium magnets`
RE: Press fitting neodymium magnets`
You can also find "canned" Nd magnets, like these:
http://in.misumi-ec.com/asia/ItemDetail/1010014735...
RE: Press fitting neodymium magnets`
RE: Press fitting neodymium magnets`
https://www.magnetics.com/product.asp?ProductID=42
They are impressive. But maybe a little over engineering the problem. It would definitely be the easiest fix. I think I'm just going to go for it in my second phase of prototyping. I'll get pictures of what I have thus far.
RE: Press fitting neodymium magnets`
The only other way I can see it working too well, without chipping the magnets, is to possibly use a heat shrink fit rather than pressing it in. Personally I haven't use heat shrink fits with anodized aluminum, only bare aluminum, so I haven't really looked into how it might go differently with the surface changes.
RE: Press fitting neodymium magnets`
I just ordered a ranged index of drill bits sizes (D-F), a ton of magnets, and get to it. Ill have to spec each magnet, unfortunately american magnet tolerances seem to be tighter than over seas, go figure.
RE: Press fitting neodymium magnets`
RE: Press fitting neodymium magnets`
The cylinder was just epoxy-ed in and the other was press fit.
RE: Press fitting neodymium magnets`
RE: Press fitting neodymium magnets`
RE: Press fitting neodymium magnets`
RE: Press fitting neodymium magnets`
You'll need to experiment a bit with the tolerances for the right clamping. But the magnet will sit better than with a cold press fit.
Benta.
RE: Press fitting neodymium magnets`
RE: Press fitting neodymium magnets`
Wow, didn't know that. Poses a problem, then.
RE: Press fitting neodymium magnets`
https://youtu.be/CbY7zfp1g-A?t=220 example Youtube video of bonding to aluminum. Since the joint is accessible from both sides the metal-metal joint should cure just fine.
RE: Press fitting neodymium magnets`
Having broken a few neodymium magnets I'm on the sceptical side of getting a good press fit.
You can get them with adhesive backing, though the size range may not be impressive and I've had at least one case where the adhesive wasn't really enough.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Press fitting neodymium magnets`
Mike Halloran
Pembroke Pines, FL, USA