RE: springs or wire coils?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Pete Komen by way of Terry Fritz <twftesla-at-uswest-dot-net>" <pkomen-at-zianet-dot-com>

Hello RQ,

Garage door springs come to mind.  Don't know how effective they would be.
About 2 feet long and an inch or two diameter.  Thick wire, maybe 10 or 12
gauge.  Adjacent turns could be insulated with layers of plastic or just
make a frame that stretches the spring a little.

The one in my garage is 23.5" long, 1 1/4 inches diameter, 13 turns in 2
inches, and measures 1/2 ohm (painted so adjacent turns shouldn't short an
ohmmeter).  A laminated core would be the way to go, but insulation would be
no problem; shrink tubing would do the job on the core.  Calculates at about
37.9 microHenries (no core).  Could insert several ferrite antenna cores.

It's awfully big for what it would do.

Regards,

Pete

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Wednesday, April 25, 2001 7:55 AM
To: tesla-at-pupman-dot-com
Subject: springs or wire coils?

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<RQBauzon-at-aol-dot-com>

instead of doing tedious winding for solenoids and chokes, can relatively
long (like 1ft.) springs be used? and, if so,  if a ferrite core is needed,
can a relatively long nail be pushed into the sprinng?

spring winding~~~~~~~~~~~~~~~~~~~~~~~~~~~
I____________________________________
I___ferrite_nail________________________>
Ispring winding~~~~~~~~~~~~~~~~~~~~~~~~~~~