From: Jack Smith
Subject: Anyone Seen a Universal Coilwinder in Action?
X-Newsreader: Forte Agent 1.92/32.572
Date: Wed, 08 Jan 2003 01:25:27 GMT
NNTP-Posting-Date: Tue, 07 Jan 2003 20:25:27 EST
Organization: Cox Communications
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.