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Demagnetising drill bits
http://www.tacticalwargames.net/taccmd/viewtopic.php?f=7&t=9170		 Page 1 of 1
Author:  ragnarok [ Tue Apr 17, 2007 5:36 pm ]
Post subject:  Demagnetising drill bits
The other day I brought myself a nift set of drill bits that go from 0.3 to 1.6mm (I have no idea why  :p ).  However, either at the store, or on my desk (much more likely since I have neodymium magnets laying all over it) they have become magnetised and whenever I open the case they try to jump into each others grooves, or two will pick on the one between them and try to propell it out in the manner of a rail rifle  :confuse: .

I am going to steal err borrow a micrometer from work to make sure they go back in their right grooves, but I need to demagnetise them, any idea how too?

I have to admit here that I have a degree in physics and I can't remember how to demagnetise objects  :blush: .  I think that heating and hitting with hammers might work.
Author:  Moscovian [ Tue Apr 17, 2007 5:50 pm ]
Post subject:  Demagnetising drill bits
You're timing is odd in that I bought mine just recently as well (along with that little wooden drill handle).  I have found them doing the same thing, although I will admit it isn't a strong attraction.  I chocked it up to static charge (due to the plastic container).  

Those buggers are so thin I wouldn't recommend hammers or heat :p.  If it is indeed a static problem I'd think it would be much easier to remove.  Personally, I was planning just plunging them into a stiff block of foam and being done with it.
Author:  tchristney [ Tue Apr 17, 2007 6:08 pm ]
Post subject:  Demagnetising drill bits
Heat should be fine, and is probably your only chance. I'm not sure how hot they will need to get, but the bits are already tempered steel so should be able to withstand fairly high temperatures. Make sure that your heating and cooling is done slowly (annealing) and free of magnetic fields.

The way to rule out static charge is to ground them. Touch them to a metal computer case and they will fall apart. If they stick to the case instead, then they have been magnetized (probably at the factory.)

Also, you can buy a plastic vernier caliper at a DIY store for probably less then $3. You really don't need a micrometer to measure the bit diameters.
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