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Forum Index : Windmills : NdFeb.
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DaViD Senior Member  Joined: 14/01/2009 Location: United StatesPosts: 120 |
Has anyone tried shaping NdFeb. magnets to suit your application or is it impossible? Any feedback of how it went if you did try it? 
thanks,Dave If your not living on the edge your taking up to much space! |
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
Yes... but not fun. Flux from fieldlines has discussed how to do it successfully. I can't find it at present, but yes it can be done. .... ...Like this. These magnets were sculptered by painstaking machining 
This photo is from Scoraigwind (Hugh Piggott's site) found here. here: ........oztules Village idiot...or... just another hack out of his depth |
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| DaViD Senior Member Joined: 14/01/2009 Location: United StatesPosts: 120 |
Thanks oztules I've got a lot of time on my hands so I'll give it a go and see how it goes from there. I just didn't want the magnets chipping and breaking if I tried it  If your not living on the edge your taking up to much space! |
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| oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
David, make sure you track down how to do it properly, or you will ingest rotten vapours, and probably kill the magnets with heat if not done correctly. I will try and find the link.. ........oztules Village idiot...or... just another hack out of his depth |
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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi oztules, I think the photo is a before shot. It may be possible, but heating and shock from grinding may degrade magnets too much. I have cut SamariumCobalt blocks, and rounded damaged Neos. The buildup of grindings on the work does pose a challenge. You get white grindings on the samarium type. Quite spekky. There is a lot of energy released when the magnet is treated this way. I think the toxicity aspect would curb my desire to mod magnets now. I feel funny, after handling strong magnets for too long a time. I now don't play with them, but only handle them to transfer them from the stock to the final resting place on the job. Someone may have found some info on confirmed risks with handling, apart from the mechanical aspects. Gordon. become more energy aware |
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CraziestOzzy Senior Member Joined: 11/07/2008 Location: AustraliaPosts: 135 |
elements (and subsequent oxides created during grinding) themselves are rather nasty... PDF doc PDF doc "Compounds" of elements mixed together and left alone after manufacture (that is, magnet) are inert and relatively safe. I would advise if grinding, to contain powder in a viscous (sticky) solution similar to non-flammable grease etc. http://cr4.globalspec.com/member?u=25757 http://www.instructables.com/member/OzzyRoo/ |
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| DaViD Senior Member Joined: 14/01/2009 Location: United StatesPosts: 120 |
I would like that link if you can find it oztules. I have all kinds of self contained breathers since I own a industerial painting co. so those would come in handy. If I was to use a water grinder do you think that would work well enough to keep the heat down to a safe level? If your not living on the edge your taking up to much space! |
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| Jarbar Senior Member Joined: 03/02/2008 Location: AustraliaPosts: 225 |
It might be plausible to cut them on a Gem stone cutter/grinder with a coolant running during the process.Keeping down dust and heat. Anthony. "Creativity is detirmined by the way you hold your tounge".My Father "Your generation will have to correct the problems made by mine".My Grandfather. |
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| oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
David, it looks like the hardness of Neo's is about rockwell 49c... so well within range of any carbide tooling you have handy. A wet saw with carbide tipped blades should do fine. Still can't find the article, but with coolant, the fumes and temp should not be a problem anyway. Temp is a problem I would think with dry cutting, but people who have actually done it seem to be adamant that those thin (1mm) cutting disks do the job fine without cooling, and without damage to the flux... go figure?? ..here: breathing protection would be a must with this technique. They are stacked thick... not thin for a quick cut.. must rip through it very rapidly to stay cool??.. but he is adamant that no cooling is required... and 500 watts with hard drive magnets is tough to ignore. The heat must not travel through neo very well at all I guess. (I might cut up a 1/2" one tomorrow just to see perhaps? ........oztules Village idiot...or... just another hack out of his depth |
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| DaViD Senior Member Joined: 14/01/2009 Location: United StatesPosts: 120 |
Hi oztules, I'm going to give it a try also with a right angle grinder with no coolant to see what happens. Also I am going to try to water grind an angle on one side like the mags. that imsmooth had made just to see if it can be done without destroying the flux. I know that the driver mags. have a north-south pole on each face of the mag. so it would make sense to cut them in half then stack them. It's the grinding the angle on the edge i'm really worried about now that i've seen someone cut them. Thanks for the info. that really helped me out 
Wonder where he got so many mags. of the same size? all of mine are mostly differant sizes  If your not living on the edge your taking up to much space! |
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vawtman Senior Member Joined: 14/09/2006 Location: United StatesPosts: 146 |
What size shape mags do you need? I recall Zubbly(rip)drilled holes in them.Please don't mess with machining them unless your desperate and i'm sure there is no MSDS for proper protection when milling. They can't take much heat i had one fall off my woodstove and could still hold my finger on the stove for short time  |
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| DaViD Senior Member Joined: 14/01/2009 Location: United StatesPosts: 120 |
Hi vawtman, I was just wanting to experiment with the hard drive mags. that I have so I will know if I can use them in the near future. Also I have full face self contained respirators and Tyvek suits that I use for lead paint ebatement so the fumes and dust wouldn't be a problem to control. As for the mag. falling off the stove and you still being able to hold your finger on it is a little weird because you would think that some of the motors that have mags. in them operate at temps. that are to hot to touch. I dont know the actual temp. that they obtain though.  If your not living on the edge your taking up to much space! |
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| DaViD Senior Member Joined: 14/01/2009 Location: United StatesPosts: 120 |
Well I have cut 4 mags. with a right angle grinder but I ran water over them out of a hose and they cut really clean and cool to the touch. I was scared to dry cut them. I really dont know why it's not like I'm going to use the mis-matched ones for anything constructive. If your not living on the edge your taking up to much space! |
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