Electronics > Beginners
Think I can make it? (electric 9-pole radial engine replica)
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Gregg:
I probably thought you were using more than 16 turns since the magnetic field is proportional to ampere-turns.  More turns at lower current equals the same magnetic flux and usually less heat.
But just getting it to work is the first step, take some measurements and modify if necessary. The magnetic field doesn’t care if the wiring is neatly wound. You do need to make all the coils wound the same direction.
I believe you have a lathe.  You could wind the first coil, put some heat shrink or tape around to keep it from unravelling; hold the first wound nail against a chuck jaw with tape while you wind the second, repeat for the third.  You probably don’t want to wind it very fast so you can count turns.
This is a great project; you do all the work and I just observe. 
metrologist:
Not much else to do but put it together now. I'll see how many turns feels write when I start rapping.
metrologist:
I got as far as winding the first set of 22 turns. I decided to test for a magnetic field by running an amp through the circuit, and could not detect any field with ferrous objects or magnets. I set a small magnet on top of one of the nails and reversing current had no effect on the magnet.

I recall an elementary school exercise involving a 6V alkaline lantern battery, some speaker wire, and a nail. I should go back and study my notes.

This is 28ga wire and can only handle about 1.5A, so I'm sure this design will not work.
jpanhalt:
Your magnet wire looks used and could have multiple shorted turns.   Try the test with ordinary, vinyl insulated hook-up wire (stranded or solid).
Gregg:
I don’t envy your task of winding wire in such a tight configuration.  Maybe it is time to bench test your theory.  Maybe three nails through a block of wood to try more windings, different voltages etc. and test the magnetic fields with a lot less hassle and if a meltdown occurs it won’t ruin all your hard work.  For a bench test you could wire coils with separate lengths of wire to make things easier and possibly test three phases.
I’d start by drilling holes in the wood so that the nails are a tight fit but not split the wood and grind off the nail points flush with the back.  Then during your tests you can put a suitable steel washer or sheet of steel across the bottom of the nails and see how much it enhances the magnetic fields and what it does to the current draw of the coils.
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