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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Has anyone here worked extensively with neo's? I need to mount them on a disc that is going to spin at about 600-1000rpm. Is it possible to drill a hole in them for a screw insert or will this shatter them? Does anyone know if they are sold with a hole in the center for mounting on rotors?
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
any kind of machining will very likely damage/overheat them. they are usually glued down by some sort of adhesive. I have used loctite speedbonder series on metal/composite parts with great results, and I think it would work well in this application. It was Loctite H8500, great stuff to work with.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Is this Loctite the same thing I can get at NAPA Auto or Home Depot, or is this something special? I have this for tightening nuts on some outdoor equipment that I use.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
no, you are probably talking about the threadlocks, 222MS or 2440, little red bottles?
the H8500 is a two part system, in caulking style cartridges. We use them by the case. but i think there are small 50ml cartridges.
If you can't get them, potting the rotor is your next best bet. Or even CA glue could work reasonably well if you route a recessed seat for the magnets first to deal with the centrifugal force.
No matter what you use, clean them really well first.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Are they the plated or non plated neos? Where I work they use some kind of 2 part resin stuff to simply stick the unplated neos inside the magnet rotors, and these are not small motors either. I'll try and find out what it actually is because I've wondered myself a few times!
As for magnets with holes, I've seen them around with countersunk holes in the centre, but I can't help thinking they would crack too easily if you weren't careful. Probably alright for positioning whilst the resin sets! Machining neos is definitely out of the question, although if you are desperate you can get custom magnets made...
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If the disk is not too small and there are many magnets e.g. 10mm thick fiberglass or composite disks, drill/machine holes for 10mm long cylindrical magnets and glue.
You should calculate the radial forces/pressures/stresses on the disk for your intended speed, diameter, magnet mass etc. OR build one for testing to destruction.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
If you want Neo's I'd suggest going here:http://www.rare-earth-magnets.com/. They have various sizes and quantities, just about everything is 8.99 for various sizes and set quantities. Also all the magnets they sell are N40 level, some of the larger magnets they sell have in upwards of 30 pound pull force.
Registered Member #81
Joined: Thu Feb 09 2006, 11:57AM
Location: Paris, France
Posts: 43
I have been involved in projects at work using water-jet cut neodymium. It's the only way to cut them. I have also been able to mill a ferrite magnet with a tabletop cnc. Try http://www.supermagnetman.net/ . This is an impressive source of magnets.
Registered Member #964
Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
Yah, is a great place. If you have some extra $$$ I recommend getting a bunch of 7mm sphere magnets, their great fun to play with. A bunch of tricks that you can do with the spheres can be found at :) Hope your project works out.
Edit: Huh.. I didn;t know url's turned into arrows...
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neodymium magnets
