[Elecraft] Torroid coil winders

[Allen C. Ward]

The core is placed into a holder on the machine.  A circular
bobin or shuttle is inserted into the hole of the core and
wire is loaded onto the shuttle.  The shuttle spins through
the hole and loads the wire onto itself.  After enough wire is
loaded to do just that one core, the operator cuts the wire
and then zeros the turns indicator and the coil is wound
with the shuttle circling in the opposite direction.  The
core rotates so that the turns are spaced on the core. =20
When the proper number of turns are loaded the wire is cut
(and all the extra wire on the shuttle must be cut) and the
wound core is treated with mylar tape, Q dope or epoxy or=20
other material (or nothing).  The leads are cut to=20
the correct length, tinned and soldered to a connector or=20
packaged for stocking.
What I have described is a small winder.  There are many
settings and adjustments which must be made for each
type of torroid and wire size and number of turns.  If there
is not a run of at least 100 coils or so it is easier to wind by
hand.  Torriods with many turns are easier using a machine.
Coils with a dozen or so turns are easier by hand even for
large numbers.
Allen KA5N


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