My coil winder is from the 1920s and no manual and when I picked it up in avery sorry state, it was minus the tensioning aparatus, so never seen.This ETA hand winder is something like the Avo Douglas coil winder but themanual for that is not very helpful on picture or description, being part 30lost in this pic, 50KI made up a workable back tensioner from VCR slip clutch, lightly sprungpulley carrier etc but it is not very good for evening out the variationdue to unwinding very light gauge wire from the supply spool giving asomewhat jerky back tension. It is many years since I was hands-on a Douglasand have forgotten what the mechanism is. Anyone know what the Avo system isor any other more reliable system. As far as I remember it was a pair ofdiscs that somehow the wire passed through and the pressure between thediscs was varied for different tension. I also seem to remember that it toowas not very good at the very lightest gauge wire AWG40 / SWG45 and it wasbetter to run through human fingers rather than the discs. At only 1 or 2 ozback tension it would sometimes grab onto the wire if contaminated orsomething and break the wire. But there must be better than human fingerback tensioner.Is there a 2-stage spool supply process? so the wire is unwound to anintermediary stage at near enough zero tension that then goes to the winder?

"N_Cook" wrote innews:g1dt4k$824$ Many sewing machines use a similar system to set the thread tension. You might adapt one from a sewing machine.Also try looking up the patent applications for such devices, you might finds something helpful.-- bzplease pardon my infinite ignorance, the set-of-things-I-do-not-know is an infinite set. remove ch100-5 to avoid spam trap

Anyone familiar with coil winding machines ?

May 26, 2008 21 Replies

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John Ferrell 18 years ago

Just a little speculation about the groove: It may be that if the pulley is transporting something like mag tape this groove is necessary to keep an air bubble from forming and "flying" the tape.

It would not be difficult to round out the bottom of an existing pulley with a lathe-like setup. I save old drill bits to make special tools for that sort of thing.

John Ferrell W8CCW Beware of the dopeler effect (pronounced dope-ler). That's where bad ideas seem good if they come at you fast enough.

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Ron(UK) 18 years ago

You dont want the bottom of a pulley for square section belts to be rounded, the drive comes from the sides of the belt. Like the vee belt on a car alternator, when it wears enough for the belt to bottom out on the pulley, it stops driving.

The slit is there so that the flat sides make correct contact

Ron(UK)

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