Hi guys

Is there a way to crack this transformer up with breaking it? I want to re wind it. thanks

edit: without breaking it

 

Last time I used a heat gun and the plastic parts were all melted.

Recently I used the de-soldering hot air gun and put a sheet of aluminium between the ferric part and the coils. It worked well. The tricky part is that you have to apply heat on both sides evenly or else the ferric would crack.

May be someone with good chemistry knowledge knew what chemical to use to dissolve the glue.

Allen

 

I use a microwave oven & it works realy well & doesnt melt the plastic bobbin. The oven i use is an old one specificly for this purpose, as its hard on the magnetrons. Have replaced acouple of magnetrons for about 30 transformers. Magnetrons are free from other dumped microwave ovens which had other problems. I have a large supply of magnetrons from the local scrap yard.

 

That core looks like it is soldered/welded together?

 

As a tip. It is not recommended to reuse copper wire from transformer windings. In a new transformer application. The reason is that the insulation on the copper wire may crack up

 

That core looks like it is soldered/welded together?

Looks Tig welded.

 

Looks Tig welded.

This transformer looks rather small so it's difficult to tell. Lots of the larger transformers like street light ballasts are welded and I've cut through the weld with a disc grinder, then rewelded it back together. Salvaged the 120 volt coil(s) added a secondary for a fairly large capacity battery charger.

 

I use a microwave oven & it works realy well & doesnt melt the plastic bobbin. The oven i use is an old one specificly for this purpose, as its hard on the magnetrons. Have replaced acouple of magnetrons for about 30 transformers. Magnetrons are free from other dumped microwave ovens which had other problems. I have a large supply of magnetrons from the local scrap yard.

Are those glue stuff safe? I mean not poisonous? I don't have a spare microwave oven.

 

That core looks like it is soldered/welded together?

Not welded together, I can cut some off with a utility knife easily, I just can't cut through it.

 

I use a microwave oven & it works realy well & doesnt melt the plastic bobbin. The oven i use is an old one specificly for this purpose, as its hard on the magnetrons. Have replaced acouple of magnetrons for about 30 transformers. Magnetrons are free from other dumped microwave ovens which had other problems. I have a large supply of magnetrons from the local scrap yard.

Thanks for your idea, I used a toaster mini oven I have spare, 180 degree C, perfectly done.

I removed the transformer as soon as the oven hit 180 degree C.

Thanks

 

Heres a picture of a few ive done & the old oven. It is hard on the magnetron. Here in Australia a basic oven new is $45. So there is no shortage of ovens thrown out with minor faults.