Jacobs 26 coin mech

[joesquid]

I've been working on a Jacobs 26 for a friend (needed a complete rewiring) and have been running into a problem with the one and only electrical part of the coin mech...the rejector coil.  When I first looked at it, it had a winding resistance of nearly 2200 ohms.  It buzzed a little when it was energized so I pulled it and lightly sanded the contact points and that seemed to fix the problem.  Then, to add insult to injury, one of the soldered leads snapped off under the outer insulation so I had it rewound.....twice.  On both occasions the coil worked for nearly one minute then would start buzzing, then literally cook itself.  Final resistance reading was 303 ohms in both cases.  Does anyone know what the actual specs for this coil is (i.e. initial resistance, wire gage, number of turns, etc.)?  I know the mech will work fine without the coil but I really want to retain the "originalness" (is that a word?) to the machine.
Thanks for the help!

[johnieG]

Hmmm typical reject coils are low current devices so if you have an average line voltage of 120 volts AC across it & the coil resistance was 2200 ohms then 120V/2200R=.054A(amps) of current  so 120V x .054A=6.54W (watts) of power being consumed (dissipated as heat)by the original coil, so about a 24-26 gauge wire should have been used to wind the coil, to figure out how many turns it would take you'd have to look up the resistance per foot for the say 26 gauge wire that would equal ~2200 ohms (sorry I don't have my wire/gauge resistance chart handy)

now lets see about the "rewound" coil

120V/303R=~.4 amps(.396)  or about 48 watts (120Volts x .4Amps) seems like it wasn't rewound correctly thats way to much current for something as small as an
electromagnet/coil.   hope it helps      '>

[joesquid]

Johnnie,
  Thanks for the info.  I was assuming 26 gage wire but am also assuming that 2200 ohms is correct for this coil as that was the reading I got from it before having it rewound.  In both cases, the coil was rewound to 2200 ohms (+/- 30 ohms).  Yet, in both cases, the coil cooked itself within two minutes of having power put to it.  By the time I said "enough" and killed power, resistance had dropped to 304 ohms.  To me that says it wasn't wound right but what I REALLY want to know is what the original ohmic value for this coil is SUPPOSED to be.  2200 ohms may not be the correct value.
thanks!!

[johnieG]

you could pull an coin reject/electromagnet out of a 9800 series coinco as they run on 120volts ac too & compare, the coil might even fit the original core of yours, just a thought,