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Re: Transformer basics (winding)

On Mon, 4 Mar 1996 13:30:23 +0700, you wrote:

>>From chip Mon Mar  4 13:18 MST 1996
>Date: Mon, 4 Mar 1996 13:18:13 +0700
>From: chip (Chip Atkinson)
>To: tesla
>Subject: Re: Transformer basics (winding)
>
>>>>>
>>Variable speed
>>A turn counter
>>Reversible power feed
><<<<
>
>You can get variable speed with your variac, a turn counter at the electronic
>surplus company (you'll also need some sort of cam on the shaft and a switch
>mounted so that the cam clicks it once per rev.
>The power feed is the cross wise feed to ensure that the wires lay flat.
>Since they were 31 gauge, they wouldn't natrually lay flat like a coil
>secondary's wire would.  I had to make sure that for one revolution, the
>cross feed advanced the thickness of the wire.  I calculated the amount
>the feed would have to advance based on a 28 thread/inch lead screw.  Then
>I made some wooden pulleys that were the correct diameter.  This was not 
>exact, so I used masking tape on the small pulley until I got the feed
>correct.  I made the reversing mechanism with some salvaged gears.
>
>If you saw the thing you wouldn't believe it.  I have a friend that is something
>of a machinist, and he was too shy to even borrow it.  I'm sure he was too
>embarassed to have such a kludgy thing in his shop.  
I'm not!
>
>>>
>What? Stop?  why did you reverse it? Are you talking about the direction of
>rotation or the left-to-right winding direction?
><<
>You have to stop the winding after each layer to apply the glue and mylar 
>insulating strip.  Then you reverse the cross feed and wind on the wire.
>
>If I reversed the direction that the wire takes around the core, I would
>have made a non-magnetic heating coil :-)
>
Yea, their called non-inductive resistors, that's why I asked.
>Chip
>
>As an aside to another message, when putting H2O under vacuum, it boils, it
>doesn't outgas air.  That's all I'm going to say -- don't want an non-tesla
>thread ;-)
>
Oops, I did

	jim