Re: Torque needed to spin the secondary?

• To: tesla-at-pupman-dot-com
• Subject: Re: Torque needed to spin the secondary?
• From: "Mark Broker" <broker-at-uwplatt.edu> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sat, 15 Apr 2000 12:41:44 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

I wound my 6.25" secondary using a small DC lab-bench motor with an integral
counter.  I think its torque rating was 1.2 in-lbs (tho may be 1.2ft-lbs).  It
took a little bit of time to get it up to speed, but if I needed to stop it, I
just grabbed the wire hard (wearing a cloth work glove) or grabbed the
form.  It
stopped in about 1/2 turn.

The motor did get warm after a while, but when it got up to a good speed, I was
able to wind the last 8 inches or so in only a couple minutes (and the top 8"
looks the best, too)

Mark

Tesla List wrote:

> Original Poster: "Ed Phillips" <evp-at-pacbell-dot-net>
>
> >
> > I also realized that it takes more time, effort and money to have a motor
> > connected to the tube that to have my kids turn the tube for me for a
> couple of
> > hours (while I wind it). I can pay them a good salary and still same
> money and
> > time. So I'll go for that solution (child labour, oh my ...!)
> >
> > For the higher spinning rate, needed to achieve uniform coating layers,
> > I'll use
> > my variable speed drill and some kind of support for it.
> >
> > Regards
>
>         Another advantage of using child labor (labour in the US) is that if
> the wire snags or breaks you can stop the turning instantly and correct
> the matter, particularly if you keep a supply of pre-cut strips of tape
> handy.  It's mighty hard to get a motor to stop in only a turn or two. I
> learned this long ago when trying to wind long coils on my lathe.  I
> think the extra time required to turn by hand is worth it.
>
> Ed

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