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Subject: Re: Anyone Seen a Universal Coilwinder in Action?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
NNTP-Posting-Date: Tue, 07 Jan 2003 23:33:37 EST
Organization: Prodigy Internet http://www.prodigy.com
Date: Wed, 08 Jan 2003 04:33:37 GMT
"Jack Smith" wrote in message
> For my winter project, I'm building a Universal Coil Winder, to be
> powered by a couple large stepper motors and under PIC control. When
> finished, I'll write up the project and submit it to one of the ham
> radio magazines for publication.
> I've started on the mechanical parts but I have a question for someone
> that has actually seen a tabletop Universal Coil Winder at work.
> What is the typical operating RPM for the spindle? For winding with
> small Litz wire, say 13/44?
> I have a copy of Querfurth's Coil Winding, 1st Ed. and it looks like
> there is a 100:1 gear reduction driving the spindle in the Geo.
> Stevens coil winders he discusses. With a typical 1750 RPM synchronous
> AC motor, you get 17 RPM for the spindle, or 36 RPM if the motor is a
> 3600 RPM job.
> Perhaps the machine uses a universal motor with much higher RPM.
> These speeds seem way too slow, nearly 3 seconds per turn with a slow
> motor. My little homemade hand crank winder works faster than that.
> So, has anyone seen one of the older Universal Coil Winders in action?
> By the way, I did find a video or two on line demonstrating solenoidal
> coil winding with a high speed machine and the spindle speed looked
> like several hundred RPM at least. When I hand wind a solenoid coil
> using my lathe, I use back gear and a speed of around 50 RPM.
My Stevens winder which is about 35 years old has a DC motor on it with an
SCR variable speed drive. It also has to two mechanical speed ranges set by
belted pulleys with no drive gears. It has a mechanical turns counter that
is manually preset to a number of turns. The counter counts down to zero
then trips off the motor and sets a mechanical brake. It has a head stock
and tail stock like a small lathe and can take coils up to about six inches
in diameter and eight inches long. It has no minimum size and I've wound .25
inch coils with 48AWG wire. The thickest wire I've ever used was 14AWG which
is a bit tough and requires pounding in. I've wound a lot of transformers on
it. The maximum count is 10,000 and minimum is one. For big stuff in low
range, it turns as low as 20 or 30 rpm or even slower by pumping the foot
pedal speed control. For small wire in the high range it will spool out at
about 4000 rpm. it has a gear driven wire follower that will put down even
layers or lace winding but is somewhat of a hassle to use because you have
to setup the gears for each coil type and size. I usually lay the wire in by
hand for most work. I made a bunch of aluminum and wood tooling to hold
various standard bobbins and transformer builds. I'd like to hear more about
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