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 Post subject: Looking for Square buss wire
PostPosted: Feb Thu 15, 2018 7:13 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Portland Oregon
I am looking for tinned copper square buss wire if I can still buy it and how do I find the dimensions for the different wire gages?
Ed


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 Post subject: Re: Looking for Square buss wire
PostPosted: Feb Thu 15, 2018 10:06 pm 
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https://www.tubesandmore.com/products/w ... eter-10-ft

Curtis Eickerman

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 Post subject: Re: Looking for Square buss wire
PostPosted: Feb Fri 16, 2018 12:07 am 
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Location: Portland Oregon
Thanks Curtis, just what I was looking for.
Ed


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 Post subject: Re: Looking for Square buss wire
PostPosted: Feb Fri 16, 2018 12:15 am 
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Location: S. Dartmouth MA 02748-1225 USA
Square wire is measured across the flats, using either a wire gage or micrometer/calipers. Reference an AWG or B&S chart, found online.

Buss has to be stretched before use to remove and kinks and to harden the wire. A hand tool know as "Round nose" pliers should be used to make bends. The tool has tapered round pins with no serrations so it won't leave an ugly mark. With practice neat "eyes" can be formed to place over studs and locked with a knurled nut. Alternately a simple offset through the hole into an eyelet solder lug. Tees can be looped crimped, a simple butt joint looks cleaner.

Another good tool is flush cut diagonal wire cutters. The flush cut leaves a very blunt end to the wire so the end will not cause a cosmetic issue with the eyes or tee joints.

Choose quality hand tools that have tight joints. Box joint tools are the best with 6" handles. Four inch handle may be too weak for the tougher gage wire.

YMMV

Chas

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 Post subject: Re: Looking for Square buss wire
PostPosted: Feb Fri 16, 2018 4:32 am 
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Location: Del Valle, TX 78617
You can make your own square buss wire from round wire with one of these draw plates: https://www.amazon.com/Draw-Plate-Squar ... draw+plate
You mount the draw plate in a vise and flatten the round wire so it fits in square hole. Put some grease or Vaseline on the wire and pull it with a vise grip pliers. After drawing several times the wire gets longer and work hardened so it needs to be annealed with a propane torch by heating to red heat and allowing it to cool. Continue drawing the wire smaller and annealing it until the wire is the size you like!
You can tin the wire with your soldering iron or use electroless tin solution made for printed circuit boards.

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 Post subject: Re: Looking for Square buss wire
PostPosted: Feb Thu 22, 2018 8:14 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7214
Location: Portland Oregon
I have ordered some 12 ga wire but I'm not having much luck finding the dimensions for other sizes of square buss wire, any more suggestions?
Ed


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 Post subject: Re: Looking for Square buss wire
PostPosted: Feb Tue 27, 2018 7:18 pm 
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Location: Hudson, MA
The area of a round wire with diameter D is PI x (D/2)^2

The area of a square wire with width W = W^2

For an equivalent wire gauge the area of the square wire should equal the area of the round wire

Therefore W = sqrt(PI x (D/2)^2)

Solving for a diameter of unity, the width of the square wire = 0.886 x diameter of round wire

The attached link has the diameter of round wires:
https://www.solaris-shop.com/content/Am ... 0Table.pdf

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 Post subject: Re: Looking for Square buss wire
PostPosted: Feb Tue 27, 2018 10:10 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13087
Location: S. Dartmouth MA 02748-1225 USA
This attached link has the dimensions for square wires:

http://mwswire.com/magnet-wire/square-magnet-wire/

This attached link has the dimensions for round wires:

https://en.wikipedia.org/wiki/American_wire_gauge

Note that #12 in both round and square is .0808, the bonus is the greater area for square. In terms of 20's radio it means increased stiffness for long runs of bus, less resistance in the filament circuits of sets with larger numbers of tubes..

Chas

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