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 coil forms

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sitn
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Join date : 2013-08-12

PostSubject: coil forms   September 9th 2013, 9:22 am

Greetings,

Don't know if I am in the right spot or not, but here goes. Has anyone used toilet paper rolls or cores for coil forms? I have saved a few real nice round ones and thought about painting them with fiberglass resin to stiffen them up, and then winding coils on them. Of course you will need some kind of mounting. Either a tube base or maybe some sort of pin where they could be soldered onto the chassis or whatever. I even thought about making a variometer(sp), with cardboard tubes and some kind of ball inside.

What do you think? Let me know, as I am about to try something like this on a home brew set.

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Cliff Jones
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Join date : 2010-11-22

PostSubject: Re: coil forms   September 9th 2013, 10:37 pm

Yes I have wound coils by hand on both toilet paper rolls and paper towel rolls. Using melted wax to cover windings and seal tube from moisture.
PVC pipe would be easier though. And you can get that in very nice sizes.
Have you thought about using wiffle balls for your variometers?
If you put a limit on the rotation then you wouldn't have to make bushings for the connections.

The ball style is going to be hard to keep the windings symmetrical and in place. Maybe super glue in segments as you wind?

I've seen some old ones that were grooved for the windings, which I'm sure made winding them easier.

variometer calculations

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copain
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PostSubject: Re: coil forms   September 15th 2013, 3:27 pm

What in the world are "wiffle Balls"?
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sitn
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PostSubject: coil forms   September 15th 2013, 4:10 pm

Wiffle Balls? I believe my wife told me they are round plastic balls about the size of soft balls that have holes in them. Kids play with them by throwing or batting them around. My be a better answer for the description, I don't remember exactly. I have seen them somewhere.

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Cliff Jones
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PostSubject: Re: coil forms   September 16th 2013, 4:42 pm

The holes allow air to pass though them slowing the balls down so kids and the less sport inclined can have fun playing baseball in the street. Lot safer for windows and direct head contact too.

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sitn
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PostSubject: Holes in ball   September 16th 2013, 5:17 pm

That is why I have all those holes in my head. To slow me down!!bounce bounce 

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