It's been years since i did this. It's not difficult once you get the
first E lamination out and have room to work. Use an old small knife and
hammer to separate and remove the outer "I" lamination (if any). The
dope is brittle and should break very easily. Now do the same for the
first "E" lamination using the knife to crack the dope all the way
around. Make sure to crack the dope at the tip of the center leg as
well. Now put a thin flat bar against the  the center leg of the "E"
lamination and tap with hammer to drive it out. Now it's just a process
of separating the laminations with the knife and pulling them out.

You will probably not be able to get the last lamination back in on
reassembly. The transformer should still work just fine. It will have a
more audible hum than the original unless you arrange some way to clamp
the laminations very tightly.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Arkady Skorokhod
> Sent: Wednesday, June 12, 2002 3:53 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [OT]: Help! disassembling transformer
>
>
> Hello,
>
> I have a moderate size mains transformer to be rewinded.
> Stricly speaking I want to change
> secondary winding only to obtait voltage I need.The
> transformer is a standard type core composed
> from "E" and "I" type laminations.
> The problem is that the laminations sit very tight and all
> the transformer is well soaked with dope.
> Probably I could disassemble the core with pliers and hammer
> ;) with brute forse but assembling
> it back may become more problematic.
> Is there any recipe which could help to do the job?
>
> Thanks,
>
> Arkady
>
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