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No secondary coil form/former
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To: tesla-at-grendel.objinc-dot-com
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Subject: No secondary coil form/former
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From: EDHARRIS-at-MPS.OHIO-STATE.EDU
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Date: Mon, 13 Mar 1995 18:53:21 -0500 (EST)
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>Received: from ohstpw.mps.ohio-state.edu by ns-1.csn-dot-net with SMTP id AB00762 (5.65c/IDA-1.4.4 for <tesla-at-grendel.objinc.COM>); Mon, 13 Mar 1995 16:53:29 -0700
Hey all! Here's a proceedure I'd like to pass on for possibly cutting
down on coil form losses:
Don't use any form! I was playing around this weekend and found that I
could wind a coil of magnet wire on a waxed paper coated PVC form. The PVC was
slitted up/down one side to allow it to collapse when I was ready. I wound a
8"long 4" diameter coil and coated it with 2 coats of Celluose Nitrate based
laquer ( that's all I had), let dry for 1 day, then collapsed the PVC form. So
now I've got a fairly rigid free standing coil with no former material save a
bit of waxed paper which was "glued" to the inside. The coil is very stiff but
could easily be crushed - it could support a light aluminum toroid but I'd use
a thin stiff internal support for much more weight.
If I do this for real, I'll use thin polyethylene sheet between the
PVC and windings, and I'd probably try to find some low loss Q-dope
(polystyrene varnish: that's why it's called Q -)for coating the coil.
Aloha,
-Ed