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OS:MPMM:Safety
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Safety considerations in replicating the OC MPMM Magnet Motor
An open source project.
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Safety
On Jan. 15, 2008, Al... wrote (http://www.overunity.com/index.php/topic,3871.msg70719.html#msg70719):
What I've seen look really good, I think people are doing some impressive work, and I hope having some fun too.
I don't have much time, but here are a few tips
First, safety. Safety First!
- do not leave magnets lying around loose, even for a few moments. They are easy to lose control of, and hot flying pieces and pinch hazards are to be taken seriously. I use metal jar lids as magnet trays.
- do NOT grind, burn, etc. these NdBFe magnets! The dust is toxic and otherwise obnoxious, the fumes are toxic and smelly, etc.
- do not rely on adhesives! use structure to retain magnets against fields and forces.
Next, machining acrylic plastic and polycarbonate:
- Use WD-40 or clean kerosene (NOT GASOLINE OR PETROL!) as a cutting lubricant to keep drills, taps and other tooling cool and cutting well. Beware of alcohols--acrylic crazes and loses strength on exposure to alcohol--even the alcohol in a Sharpie marker will craze the acrylic over time, and cracks will occur. Wash the WD-40 off with dishsoap and warm water.
- plastic supply companies sell special drill bits with a sharper tip angle that won't crack or pull though the plastic. They are well worth the price.
- I usually use bottoming taps even when starting, in plastic, I rarely need the plug tap to start a tapped hole. The bottoming tap makes a better thread I think.
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See also
- OC MPMM Magnet Motor - main page
- Magnet Motors
- Open Source Projects
- PESWiki
