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Old 08-19-2014, 08:53 PM   #1
kbroderick OP
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Best way to stick nickel-plated neodymium magnet to anodized aluminum brake disc hub?

Like the title suggests, I need to attach a magnet to my front brake hub. The magnets I've got are tiny neodymium deals (1/4" diameter x 1/16" deep), and the disc hub is aluminum (anodized, I think).

Previously, I used Gorilla Glue and then wrapped the magnets in gaffer's tape, with the intent that it would just serve to hold them in place while the glue set. As it turned out, the glue didn't hold as well as I hoped, but the tape worked for a few weeks. I'd love to come up with a better solution—maybe there's an epoxy I should be using? The Gorilla Glue seemed to be the best option of the adhesives at the local hardware store.

And yes, I would prefer to have an actual mechanical connection (i.e. something that screws or bolts into place), but the brake setup and speedo pickup don't lend themselves to changing the setup at this point.
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Old 08-19-2014, 09:03 PM   #2
wadenelson
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Very light sanding of both surfaces, clean with alcohol, allow to dry, then cyanoacrylate. SuperGlue.

Superglue works by an aerobic/anaerobic reaction. That is it MUST be exposed to air, and THEN all air removed for it to react properly and completely.

So you put a drop or two on the magnet, press the two surfaces together so excess glue squeezes out, THEN take them back apart for a few seconds, exposing the SG to air, THEN press them together again. 90 seconds and you'll know if you have a good bond.

As long as I'm teaching about Superglue, it works great on slit type cuts in places that try to continually pull apart.

But do NOT put it in the wound itself ! Stings like fire, for hours!

Hold the two edges of the wound together tightly, and form an artificial skin over the wound using SG. Wait 10, then apply a second coat.

Keeps dirt/debris out of the wound and thus heals a lot faster than using bandaids, etc. '

Next week: Home surgical techniques....
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Old 08-19-2014, 09:31 PM   #3
RVDan
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Quote:
Originally Posted by wadenelson View Post
Next week: Home surgical techniques....
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Old 08-19-2014, 09:39 PM   #4
XtreemLEE
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Quote:
Originally Posted by wadenelson View Post
But do NOT put it in the wound itself ! Stings like fire, for hours!

Hold the two edges of the wound together tightly, and form an artificial skin over the wound using SG. Wait 10, then apply a second coat.

Keeps dirt/debris out of the wound and thus heals a lot faster than using bandaids, etc. '

Next week: Home surgical techniques....

Don't do this, many toxins in SG, use a proper wound glue.
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Old 08-19-2014, 09:53 PM   #5
anonny
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My votes with epoxy or go to Acewell and buy a bolt with a magnet imbedded in the head of it.
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Old 08-19-2014, 09:57 PM   #6
Anorak
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There are bolts with a magnet in the head, link. Any two part epoxy should work fine, J.B. Weld etc. The clear five minute shit should be perfect.
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Old 08-19-2014, 10:39 PM   #7
GreaseMonkey
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If you don't want to go the bolt route, I'd suggest countersinking a hole in the rotor and epoxy it flush after you've put the magnet in.
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Old 08-19-2014, 11:00 PM   #8
wakewop
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Shoe goo. Maas held my ktm magnet in my rotor for 5 years
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Old 08-20-2014, 02:20 AM   #9
Bounder
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JB weld doesn't work for magnets, tried it when fitting my Koso Digidash and the magnetism pulls all the metal particles to one pole of the magnet, pulled all the epoxy with them as well!
Clear epoxy is fine but anything with metal in it is no good for magnets.
Any chance you can drop them into the heads of the disc bolts?
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Old 08-20-2014, 03:30 AM   #10
Diddy
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Is there not an issue with putting it in the disc bolt? What happens if you’re required to remove the disc?

Proper preparation prevents poor performance of the adhesive!
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Old 08-20-2014, 04:13 AM   #11
Bounder
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Use a stack of the same magnets to remove them from the socket head bolt.
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Old 08-20-2014, 05:42 AM   #12
concours
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Epoxy. JBWeld is a good one.
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Old 08-20-2014, 05:59 AM   #13
matey peeps
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Epoxy or a 2-part urethane bumper repair glue
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Old 08-20-2014, 06:01 AM   #14
JimVonBaden
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Quote:
(1/4" diameter x 1/16" deep)
You guys are way overthinking this.

3M trim tape:

http://www.3m.com/product/informatio...ding-Tape.html



I use it all the time for wheel weights, same environment and application.
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Old 08-20-2014, 06:27 AM   #15
MotorradMike
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I used epoxy to glue one to my inner disk ring at least 5 years ago and it hasn't moved yet.
Steel ring though.
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