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Registered Member #239
Joined: Thu Feb 23 2006, 03:15AM
Location: canada
Posts: 23
Self Defenestrate wrote ...
I've had some luck with those ultra thin diamond dremel cut off disks, if you hold the core in something soft to ease the vibrations. Once the outside is done, I can usually boil and twist the cores apart. The inner rod part of the core is sanded a bit to flush everything up, and there you have it.
hm thats a good idea as removing a small portion of the core is much better than a huge crack.
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
Hmm. I don't seem to have that much trouble. I usually just slide a utility knife down in the cracks and it pops apart. In fact, I rewound two today, then proceeded to drop one on the concrete floor.
Registered Member #55
Joined: Thu Feb 09 2006, 04:56AM
Location:
Posts: 149
I have alwaysed boiled mine as well with great success. It took a few times but after awhile you get it down. I have boiled some large ferrite transformers successfully. I use hi temp silicone gloves, boil, wiggle, boil wiggle, boil wiggle and eventually it comes loose. All the transformers I ever boiled came with yellow or blue tape around them, I dont know if that clues you into the type of epoxy used or not. Now I find it easier to just buy the dang ferrite/forms, no more ferrite soup.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hmm. I don't seem to have that much trouble. I usually just slide a utility knife down in the cracks and it pops apart. In fact, I rewound two today, then proceeded to drop one on the concrete floor.
You disassemble big ATX supply transformers that way (poorly epoxy-ed transformer?)
I decided boiling is'nt worth effort after several trials, core ended with tny fractures (epoxy wasn't bothered at all.
Thing I didn't try is sawing the edge of former and then making soup as some from here recommend, but seems like quite a bit of work, and you need 2 transformers dead to make one new..
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
There's definitely 2 different kinds of glue they use...
If the transformer has the white epoxy, I've come to the conclusion that it isn't worth bothering. I guess you could unwind and rewind the transformer without dismantling it at all, which I might have a go at. The other kind of resin is brown and opaque, and seems to melt into liquid at <100 degC. I used to dismantle ordinary mains transformers as well, to get the steel laminates - they make great packing for lathe tools. I guess you could boil those transformers as well as they use the brown stuff!
Registered Member #239
Joined: Thu Feb 23 2006, 03:15AM
Location: canada
Posts: 23
Self Defenestrate wrote ...
I've had some luck with those ultra thin diamond dremel cut off disks, if you hold the core in something soft to ease the vibrations. Once the outside is done, I can usually boil and twist the cores apart. The inner rod part of the core is sanded a bit to flush everything up, and there you have it.
Quoting this again because I just received some diamond disks and they are very good at cutting ferrite. The normal cutoff disks are slow and crack the ferrite easily.
Price was not bad, $11 shipped for 10 disks. Ebay seller lau*** (he had lots of diamond tools for cheap).
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separating smps transformer cores
(poorly epoxy-ed transformer?)
