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A question about coil winding - Page 40

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Posted by Jasen Betts on December 25, 2009, 9:13 am
 



it appears that you are talking to yourself.


Posted by Fred Abse on December 25, 2009, 5:55 pm
 


On Fri, 25 Dec 2009 09:13:05 +0000, Jasen Betts wrote:


Not just talking, I think ;-)

--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
                                             (Stephen Leacock)

Posted by Jim Wilkins on December 8, 2009, 12:59 am
 


You can wind a bobbinless, free-standing coil by hand by zig-zaging
the wire from side to side, each turn pressed against and held at the
ends by the previous one.
http://www.lakefish.net/images/product_photos/rope_11.jpg
It isn't as hard as it looks at first and you can hold it together
with tape flaps that you lift as you go around. Some of the filter
coils in old radios were wound this way, often several windings spaced
along a core tube. Double stick tape will hold the first turn in
place. At each end you jump the wire over the previous one so the new
wire is always on the same side.

It isn't the fastest way, but it requires nothing but fingers, the
wire and a core, such as cardboard wrapped around a dowel, that you
can pull out afterwards.


jsw

Posted by Michael B on December 8, 2009, 3:42 am
 



That is indeed tantalizing. Thanks for bringing it to my attention.

Posted by Josepi on December 21, 2009, 11:48 pm
 

Really cool! Except for one thing. Your photo sample is still wound on a
form and is not free standing, the same as you need to wind a coil.
Bobbinless, sure.

The zig-zag is not recommended for enamel insulated wire as it puts a lot of
mechanical stress on wire insulation crossing each other, the resultant is
bulky, not as flexible and cannot be formed into the laminations after
winding.



That is indeed tantalizing. Thanks for bringing it to my attention.


You can wind a bobbinless, free-standing coil by hand by zig-zaging
the wire from side to side, each turn pressed against and held at the
ends by the previous
one.http://www.lakefish.net/images/product_photos/rope_11.jpg
It isn't as hard as it looks at first and you can hold it together
with tape flaps that you lift as you go around. Some of the filter
coils in old radios were wound this way, often several windings spaced
along a core tube. Double stick tape will hold the first turn in
place. At each end you jump the wire over the previous one so the new
wire is always on the same side.




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