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Didn't want to highjack Allthumbs' thread so thought I would start another. I've been doing some calculations and experiments with solenoids the past couple of days. I decided to build a solenoid 2" long and 1" OD. The inside diameter of the coil is .45". As shown below, I made the bobbin out of 1" diameter black delrin. I bored an 11/32" hole, 2 inches deep and epoxied a piece of thin walled brass tubing inside. This makes the bobbin stronger and, perhaps, wear better without having any affect on the magnetic properties.
Then I turned the inner part to .45" diameter and parted off the finished bobbin.
I drilled a very small hole in one of the flanges to feed the start of the wire through. Then I mounted the bobbin on a 5/16" bolt with a rubber washer over the end with wire protruding, started the wire, and chucked it in my lathe.
Here's a picture of the 8lb spool of wire
I wrapped about 350 feet of #28 wire on the bobbin and secured it with black electrical tape.
The measured resistance was about 20 ohms and the wire is rated at a maximum of about .32 amps.
Continued on next Post...
Then I turned the inner part to .45" diameter and parted off the finished bobbin.
I drilled a very small hole in one of the flanges to feed the start of the wire through. Then I mounted the bobbin on a 5/16" bolt with a rubber washer over the end with wire protruding, started the wire, and chucked it in my lathe.
Here's a picture of the 8lb spool of wire
I wrapped about 350 feet of #28 wire on the bobbin and secured it with black electrical tape.
The measured resistance was about 20 ohms and the wire is rated at a maximum of about .32 amps.
Continued on next Post...