PSN-L Email List Message

Subject: Re: Interesting sensor pickup.
From: BOB BARNS roybar@........
Date: Mon, 07 May 2001 20:23:33 -0400

  I wound a 12,000 turn coil using #36 (0.005") wire.  This is about
7,300' of wire (3,000 ohms).  The coil form had a core about 1.5" in
diameter by about 1" wide.  Plexiglass sides were attachted to the
core.  The winding depth turned out to be about 0.5".  The wire was
guided back and forth by my fingers (gloves).
  There was no problem with the twist accumulating.  It took 10-15
mins.  (est.) to wind which would be about 1,000 rpm.  The lathe was
started and stopped with its regular switch.


"Westfall, Ron" wrote:
> Hi Bob
> I had thought of that, but I was concerned about introducing a twist into
> the wire.  I don't know whether the twist would accumulate over time, but
> the wire is so fine that any twisting force causes it to form loops, etc.
> Even at the fairly slow pace of 100 RPM, I did not want to take the chance
> of snarling up the wire, or worse yet, breaking it.
> By the way, the lathe I was using had a treadlebar off switch down near the
> floor.  By stepping on it, the lathe stops very quickly.  This is real handy
> if a snarl does start to form.  I ended up using it a couple of times when
> things started to get out of hand.  If anybody else is thinking of power
> winding coils, a fast off switch is a real useful feature to incorporate.
> Ron
> -----Original Message-----
> From: BOB BARNS [mailto:roybar@.........
> Sent: Friday, May 04, 2001 5:32 PM
> To: psn-l@..............
> Subject: Re: Interesting sensor pickup.
> Ron,
>   Winding a coil using a lathe (or any other means of spinning the coil
> form) is easier if you put the spool of wire on the floor.  Stand the
> spool on end so that the wire comes off the end.  This means that the
> spool does not need to turn, i.e., no tension is placed on the wire by
> accelerating the spool.
> Bob
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Larry Cochrane <cochrane@..............>