"How To" wrap a rotor magnet...

[mohanjude]

James

I asked the forum on help with my damaged 1521 rotor. I applied epoxy on the magnet and it worked. However I got scared as after a 5 min run when I took the rotor out the epoxy was getting soft. I remember somebody talking about heat resistant epoxy. Dont know where to find the stuff. The epoxy you used on your picture is exactly the same stuff I used. Dont know if it will soften once the rotor is spinning at 30k rpm and the heat is high. Last question - do you think you will have enough clearance?

Mohan

[lutach]

Originally Posted by mohanjude

James

I asked the forum on help with my damaged 1521 rotor. I applied epoxy on the magnet and it worked. However I got scared as after a 5 min run when I took the rotor out the epoxy was getting soft. I remember somebody talking about heat resistant epoxy. Dont know where to find the stuff. The epoxy you used on your picture is exactly the same stuff I used. Dont know if it will soften once the rotor is spinning at 30k rpm and the heat is high. Last question - do you think you will have enough clearance?

Mohan

Mohan,

You can find some info here http://www.solarcomposites.com/compo...itespools.html and http://www.solarcomposites.com/compo...20sleeves.html. Send them an e-mail and ask them what epoxy they recommend.

Regards,

Luciano.

[lincpimp]

Originally Posted by lutach

Linc, you did it like most place will tell you to do it. You'll have a little access and that can be removed. I can't wait to see how it looks.

(Off-Topic: How's the 100A ESC doing in the crawler?)

Funny story about the crawler esc. I have waited for the 17.5t motor since about 2 days after I recieved the esc you sent me. Just got the motor in yesterday. I have a feeling the guy put the wrong addy info on the package and then had to resend it when it came back to him. He was nice and included a hacker e40 sensored 13.5t motor for another 20 bucks. Good guy. I will have the motor and esc in the crawler early next week and give it a throrough bashing on the rocks.

Originally Posted by mohanjude

James

I asked the forum on help with my damaged 1521 rotor. I applied epoxy on the magnet and it worked. However I got scared as after a 5 min run when I took the rotor out the epoxy was getting soft. I remember somebody talking about heat resistant epoxy. Dont know where to find the stuff. The epoxy you used on your picture is exactly the same stuff I used. Dont know if it will soften once the rotor is spinning at 30k rpm and the heat is high. Last question - do you think you will have enough clearance?

Mohan

I should have enough clearance, The vectran is very thing, like human hair thickness, and it is just arranged in a bunch, not woven or braided. So it lays out flat when wrapped. I would not use this epoxt to hold a magnet together. Jb weld is much beter at handling heat than this epoxy, but is much thicker. You can thin the epoxy out with a heat gun, and get it very runny, but that also makes it dry faster.

[lincpimp]

Ok, tried to remove the shrink tubing just now... It did not want to come off. So I now know to test the shrink tubing before use to see if epoxy eats into it and sticks!

So I removed the entire wrap to start again. I will say that it is some tough stuff, does not come off easily. So I think the basic theory is sound, just need to perfect the application technique a bit. I will post some more pics when I try it again.

[JERRY2KONE]

Good info Linc. Maybe you need to coat the inside of the shrinkwrap with something to keep it from sticking to the epoxy, hence making it easier to remove after the epoxy has hardened/dried. I am not sure what you can use without affecting the epoxy itself, like WD40, or Pam, or some other kind of releasing agent. The proceedure is kind of interesting to watch from the outside perspective. Thank you for sharing this with us.

[brushlessboy16]

Originally Posted by lincpimp

Ok, tried to remove the shrink tubing just now... It did not want to come off. So I now know to test the shrink tubing before use to see if epoxy eats into it and sticks!

So I removed the entire wrap to start again. I will say that it is some tough stuff, does not come off easily. So I think the basic theory is sound, just need to perfect the application technique a bit. I will post some more pics when I try it again.

I was wondering if that was going to happen..

Why not a later of way paper or something?

[What's_nitro?]

Originally Posted by brushlessboy16

I was wondering if that was going to happen..

Why not a later of way paper or something?

Even better, use plastic sandwich wrap. It's very thin and also impermeable. Wax paper might still allow some epoxy to get through and stick it all together, plus it's much thicker than the plastic wrap.