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Registered Member #1438
Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
In vain, I spend much of yesterday and a few hours today trying fruitlessly to tare the secondary out of the MOT.
So far, I lost about: 1 screwdriver, 1 Drill bit, and a little bit of dignity :(
There has to be a easier way of prying out the secondary then using a hacksaw. I tried using a carbide tip drill bit but after repeated abuse, it snapped. In trying to punch a hole to the other side of the MOT through all the windings, my screwdriver got lost in the tangle of wires. I then switched to a Dremel but it really didn't seem like it was going to cut through all that wires anytime soon.
If anyone has any suggestions for taking the secondary out of the MOT any faster, please let me know.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
You still may be able to salvage yours easily
The way I've always done it is to take a hacksaw with a good blade, clamp the MOT in a vice, and cut the windings flush with the surface on both sides. Then take some sort of sturdy metal rod (but not tapered like a screwdriver or awl - they will get stuck) and hammer out the windings. Once you get a few out the rest usually pop out quite easily.
Registered Member #1221
Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196
I cut up the weldings that kept the E & I together with a angle grinder and then just took the wires out and put some new ones in and then welded it back together. If its put back together properly it can be pretty quiet.
Registered Member #1500
Joined: Sat May 24 2008, 04:38PM
Location: Ojai, Ca.
Posts: 44
Yikes, what a mess. I use a pneumatic cutoff tool to cut the welds as mentioned a hacksaw will work too. The weld is shallow except at the corners. It should then be possible to remove the seconadry intact tapping it off with wood blocks to distribute the force. I am experimenting adding primary windings. doubling ecores and having two primaies and secondaries in one assembly. Allthread works well to pull the cores together.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Cut the heater windings in the middle of the free loop, and pull them out with pliers. Then using a flat-ended rod (not screwdriver as BillyBobJoe specified), punch out the shunts. This will free up some room in the winding window. Now going back to the screwdrvier, you should be able to peel a few secondary wires into the space you've just cleared. Once the first few have gone, the rest will be easier.
Registered Member #1438
Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
I've managed to pull out the shunts and the heater windings but it the secondary still seems to be firmly in place. I noticed that there are very sturdy wax papers around where the shunts used to be and it's causing problems for me to pull the secondary out.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
It's a process of attrition. If the shunts have gone you now have some space to work. I reckon that in a screwdriver will be harder than either wax, paper, or both together. Use it, or some other slim sharp tool, to shred / damage / worry / wear / tear the insulation around the hole left by the shunts. Eventually, the hole will get bigger. Keep it getting bigger, especially in the direction of the secondary. When you get to the secondary wires, don't stop.
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Need Idea's and Tips on Rewinding MOT
Then they should be easier to remove.
