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Magnet glue??

Old 05-20-2009, 08:38 PM
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speedy72vega
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Default Magnet glue??

What type of glue is best to reglue outrunner magnets? Also, any tips for rebalancing? Has anyone tried a prop balancer on an outrunner housing?
Old 05-21-2009, 12:27 AM
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jdetray
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Default RE: Magnet glue??

When I build my own brushless motors, I always glue the magnets with thin CA. It seems to hold well.

- Jeff
Old 05-21-2009, 05:33 AM
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ron_van_sommeren
 
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Default RE: Magnet glue??

Or a good quality slow epoxy.

Glueing in magnets
http://www.torcman.de/index_e.htm
-> downloads
-> Assembly Procedure TM280, 350, 430
-> chapter 3

Vriendelijke groeten Ron
Old 05-21-2009, 07:27 AM
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Dr Kiwi
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Default RE: Magnet glue??


ORIGINAL: speedy72vega

What type of glue is best to reglue outrunner magnets? Also, any tips for rebalancing? Has anyone tried a prop balancer on an outrunner housing?
JBWeld is the only epoxy I know of which can withstand a fair amount of heat [most epoxies and CAsoften at only 60C].

Old 05-21-2009, 07:51 AM
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speedy72vega
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Default RE: Magnet glue??

Thanks guys, I appreciate the responses. The outrunner i'm talking about is a large one, a 50-65, so I think the JB Weld might be the best choice. What about balancing afterwards? Anyone balance one before?I think the reason the magnets came loose in the first place (other than it's a crappy Turnigy motor) was due to improper balancing. It vibrated and screeched, then the magnets started coming loose.
Old 05-21-2009, 10:11 AM
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jdetray
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Default RE: Magnet glue??



I wonder if a magnet was loose from the start?



JB Weld sounds like a great choice. Be sure you don't let too much adhesive build up beneath the magnet. The spacing between the magnets and the stator is probably quite small, and you don't want the magnet rubbing on the stator.



 - Jeff

Old 05-21-2009, 08:38 PM
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speedy72vega
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Default RE: Magnet glue??


ORIGINAL: jdetray



I wonder if a magnet was loose from the start?



JB Weld sounds like a great choice. Be sure you don't let too much adhesive build up beneath the magnet. The spacing between the magnets and the stator is probably quite small, and you don't want the magnet rubbing on the stator.



- Jeff

I think it was the balance issue that started it all. I ran the motor up for the first time, and about 1/2 throttle, it made a loud screeching sound, and Icould actually see the outer housing shudder. Ithought maybe the timing was too low, so Ireset it to 20 degrees, no change. On the third run, small pieces of the magnet glue started flying off, then a magnet moved down into the rear housing.
I think it wasn't balanced well, and the vibration loosened the crappy glue (it was a cheapo Turnigy motor). Too bad, because if the motor had been made better, it seems to have good potential for power.

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