This is topic Rewinding Changeover Coils in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by John Cain (Member # 352) on 04-10-2000, 09:38 AM:
Does anyone know how many turns of magnet wire are on each side of a changeover coil?
I have several to rebuild, and lost the information. Help!Thanks!
jmcain@concentric.net
Posted by John Walsh (Member # 168) on 04-10-2000, 12:31 PM:
There's no way to know, unless someone has unwound one and counted. It would be different, depending on the manufacturer, voltage, (AC or DC) etc.If you do some, tell us- it might help someone in the future.
Posted by Ken Layton (Member # 133) on 04-10-2000, 07:07 PM:
Why not just buy a new changeover coil? You can buy both the Essannay Electric "Zipper" and Weaver changeover coils from Wolk in Chicago.Kelmar coils are basicly a Guardian or Dormeyer solenoid.
Posted by Pete Lawrence (Member # 130) on 04-10-2000, 08:39 PM:
John,You'll find for this application it's not that critical. After all, the coil is on for a fraction of a second at most. I assume there is a bobbin or form the wire is wound on. All you need do is measure the wire diameter and get the right size magnet wire. Then simply fill the bobbin / coilform with about the same amount of wire. Magnet wire tables are available at www.mwswire.com/barecu1.htm and one supplier that will sell small quantities of magnet wire is Mouser electronics ( www.mouser.com ). I've done this for other solenoids in the past with no problems.
Pete
Posted by Gordon McLeod (Member # 33) on 04-16-2000, 12:57 PM:
Most Motor shops will rewind them for a fairly small fee.