How to: remove motor magnets

Z

zappy

100 W
Joined
May 26, 2011
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149
The easiest way to remove or soften epoxy is usually heat the part with a heat gun or similar until the epoxy goes above its glass transitional temperature and unpick whatever is stuck. If common sense prevails the epoxy used on your motor should have a higher glass transitional temperature than your magnets Currie temperature. Other wise why did you spend all the money on the expensive magnets if they fall off before the expensive grade is needed? Most room temperature cure epoxies have glass transitional (TG) of around 80C. Neo magnets are ceramic (like a house brick) and do not like being bent, pried, hit, knocked or dropped. When you stack 56 magnets together it becomes fairly powerful and can pull the other magnets/tools out of your grasp from a fair distance and hit together chipping them. If you damage just 1 out of your magnets it is very hard to find a replacement. A few people on the sphere are starting to cut n shut, Siamese motors or are experimenting with different thicknesses, laminated backing iron or multi segmented magnets in the original bell and need to remove existing magnets or just need to pinch some cheap magnets for another project or just repair your "favorite/lucky" motor
Epoxy can be softened with MEK solvent or probably easier to obtain paint stripper containing "methylene chloride" as the active ingredient
1: Wearing gloves brush on paint stripper from every angle you think you can get the paint stripper to attack the epoxy bond
2: Wait, be patient!
3: Do it again
4: Wait, be patient!
5: Do it again
6: Wait, then wash it off with water
7: I heated my flux ring in the oven at 50C-60C for 1/2 an hour and then they slid right off. This part may be optional but may help soften any epoxy the stripper might not of reached.
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I hope this helps.

Zappy
 
nice post-useful
i would never have the patience to do this type of job
where can you source magnets? are they expensive?
 
why? did you intend to replace the magnets with another size?

if a magnet is cracked but still in place it should still function. if it cracks and the broken piece is loose then it should be epoxied back in place and that will restore almost all of the magnetic field. but loose magnetic pieces are not found in the presence of other magnets.
 
Old motors seem like the cheapest, easiest source of neo for new motors.
 

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Thank you!!!

http://www.amazon.co.uk/250ml-M-E-K-99-9-working-delivery/dp/B005Z1K2F2/ref=pd_sim_sbs_diy_1
 
i used that stuff in almost paste like form to strip paint from the trim in my house once. once we could buy it by the gallons, but it was only about $4-5/gallon then.

i saw they have a 5 liter can for twice the money and it has 20 times as much MEK.
 
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