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After reading your posts I have decided to go with a microwave transformer winding and field as in the photo.
Having used the transformer as a magnet which was not to bad the leads connecting to the battery did not get hot and the transformer was cool.
The winding wirer is 1.1 mm in dia and the number of turns is 208 and the restance is 1.9 meg omes.
I would like to increase the magnetic field .
Can this be done removing 4 turns on the windings.
I am very great full for your support.
Having read your post the restance in the Magna bender is .0095 ohms is this correctYour power supply is in foldback current limiting. With just one of your magnets connected to 12 volts it would draw 9 amps. (You need to learn some basic electrical theory. Ohms law and power calculations.) To run 7 of your magnets from 12 volts would require 63 amps. (756 watts.) I had not heard of the "Magna bender" so I Googled it. I found out that it takes about 2.3KW I suspect the magnetic design is going to be far better than you or I could design so I would expect a DIY one to take more power. I do not think you will succeed with this project.
Les.
Then what dia wirer would I use to make this windingNo. The resistance of the Magna bender would be about 24 ohms. (240 volts version.) (This is assuming that it takes the full 10 amps of it's current rating.)
Les,