5to 1 formula for box offsets of any size

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tld38

Member
Location
Cleveland
Hello everyone. Does any one know of a 5 to 1 conduit formula for box offsets of any size pipe? Guys at work mentioned it today and I remember hearing something about it before. I don,t know if it applies strictly to electric and hydraulic benders or if it may have something to do with the travel on those benders. any advice would be appreciated.
 

kwired

Electron manager
Location
NE Nebraska
The ratio used depends on how many degrees of bend you are using not what type of bender used or raceway size. Drawing a triangle to represent your offset you will have a constant that changes when the angle changes. The ratio should be the length of the hypotenuse of the triangle to the side that represents the amount of offset. Use trigonometry to find unknown length when you know the angle and offset distance. 5:1 is not very much bend probably 10 degrees or even less.
 

kwired

Electron manager
Location
NE Nebraska
TOTAL​


ANGLE OF
DISTANCE
OFFSET
BENDS
A <-> B
1.00
5.00
11.47
1.00
10.00
5.76
1.00
15.00
3.86
1.00
20.00
2.92
1.00
22.50
2.61
1.00
25.00
2.37
1.00
30.00
2.00
1.00
35.00
1.74
1.00
40.00
1.56
1.00
45.00
1.41
1.00
50.00
1.31
1.00
55.00
1.22
1.00
60.00
1.15


From a spreadsheet I set up some years ago.

I'm guessing your original format did not copy the way you had it? I think I see the number of degrees and the multipliers but that 1.00 keeps getting in there - must be another field that stayed constant in the spreadsheat.

add: for the OP the multiplier of 5 is between 10 and 15 degrees of offset according to this spreadsheet 10 degrees is 5.76 multiplier, 15 degrees is 3.86 multiplier.
 
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Benton

Senior Member
Location
Louisiana
If you can see it you can bend it... they also have formulas on the sides of new benders. If we are talking about the same box offset, it seems to me, they are too small to consider measuring.
 

greeny

Member
Location
Southern NH
There are 2 approaches that I'm aware of: starting with a known ratio and determing the angle of bend or starting with a known angle and determing the ratio.

1) sin^-1(1 / (ratio desired) = angle of bend

or

2) csc(angle desired) = ratio

So in this case, use formula 1 and get:
sin^-1(1/5) = 11.537`
 

Cow

Senior Member
Location
Eastern Oregon
Occupation
Electrician
Hello everyone. Does any one know of a 5 to 1 conduit formula for box offsets of any size pipe? Guys at work mentioned it today and I remember hearing something about it before. I don,t know if it applies strictly to electric and hydraulic benders or if it may have something to do with the travel on those benders. any advice would be appreciated.

Do you mean 6 to 1?

10 degree bends require 6" between marks for every 1" of offset. I usually use 10 degree bends for box offsets myself.
 
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