| The problem is that the resin that "doesn't shrink" does shrink, pulling away from the sides of the magnets just a little, breaking the bond. This probably isn't a problem if you're using round magnets as the shapes involved will hold them in place, but if you're using magnets with flat sides they could much more easily slide out when the alternator is turning. However, there's a simple solution it seems, just fill the very small gaps with super glue, which appears to bond to both resin and magnet very well. I did this to the "magnet disk" I just made, watching the superglue fill the gap, took a little more than one of those small tubes the superglue comes in to fill all the gaps. Btw, I also used fiberglass drywall joint tape(very easy to cut to the right width) around the first edge of the disk(leaving the vents open to pump air through the stator/disk gap) and magnets/resin to better bond everything to the disk. I made 5 wraps with the fiberglass and then rubbed resin into it. Then I made 5 more wraps on top of that and put on more resin. I'm hoping I'll have one very tough magnet/disk, we'll see. |
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