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Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
Does anyone know how or where to find a calculator or formula to determine the length of wire needed for the coverage of the square-inches of a secondary coil?
EXAMPLE: If one were to have a 3"diameter 24" length coil & you know that 1/4 lb of 28/coated magnet wire is 314 feet, you could save a bit of money if you knew the coverage capacity of that wire.
Let's say that 1/4 spool will cover 5 square inches; then you simply determine how much coverage that cylinder coil form has and buy only what you need, etc. {That's an example out of the blue. I don't know that will cover 5 square inches.}
It's a shame to have left over wire that would not be enough for a full coil. But to know in advance what is needed would also prevent the problem of joining a new spool 3/4 of the way to completion. Determining the area of a cylinder wouldn't be difficult but to determine the coverage level of a given wire in addition would go a long way to saving time, trouble, & money. .... Any ideas?
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
JAVATC,
It can calculate how many feet of wire I need, wieght, etc, it seems fairly accurate so far.. in my case, I usually just use 10LB spools since ive gotten a hold of them easly, but I did once messure the wieght of the secondary before and after windings, and JAVATC was very acurate on the wire wieght, and lenth of it, turns per inch, which you can probably devide the total lenth of the secondary to figure out just how much wire is in an inch.
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
Yeah, Ive gotten a nice 10LB spool from a good friend of mine for fairly low price, but if you keep an eye out, either locally or the internet, you can sometimes find really nice deals for low price 10LB spools of wire.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
I have been winding some secondaries for both future use and practice because even with a coil winder, it takes some technique to get them perfect. Particularly extreme secondary's. I cannot see how some people make those super tiny coils from 36-40 "hair-wire".....
I think that is really one of the most significant elements of any type coil and when you're winding, if you don't do it fairly often you loose your "touch". Using "hand-wound" coils always seems like a major endeavor. I came across some 1/4" copper tubing for primaries and after some slow deliberate work, I found I could wind a very clean spiral without having to place it in supports first. I picked up some "tricks" with that too. They came out very clean.
If you ever see any really cute sales please PM me. I'd really appreciate it.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Just calculate circumference of your secondary, then using width of the wire you want to use (available on most wire AWG charts), determine number of turns and then finally length of the wire.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
Ouch! Thank you. You make it sound so simple I feel foolish bringing it up. I try to think of that as a formula (as it's very logical) but it's tough to get by brain around. {Circumference=area of coil form} {width of wire} {distance of wire} {Number of turns}={coverage}
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Saving Money on Secondary Coils
