conduit bends

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What do you mean by "take up"? Are you talking about the number of inches you need to deduct to make a 90?
 
Is the distance between the blue lines in the attached image what you mean by takeup? The black represents the unbent conduit, the red is after the bend is made.
 
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It will vary.

We would like to say "Every bender and every style bender has the same take-up"....that *might* be true - but I haven't used EVERY style bender available...although I used an awful lot of benders :)

Here's a website that can explain all about bending :
[Conduit Bending]

You will find information for all sorts for making pretzels ;).


Here are instructions for 45 benders made by GreenLee:
[GreenLee Bender Instructions]

Here are the directions for the:
Hand Benders - 840, 8840, 841, 8841, 842, 8842
and
Hand Benders - 843, 8843

I am "assuming" you didn't break out a Cyclone or a Chicago for 3/4" EMT.
 
I know everyone refers to take up on 1/2" emt as a 5" take up, 3/4" emt a 6" take up and so on. That situation is not always true. You just have to know what your working with. I have bent 1/2" emt with a 3/4" bender plenty of times. And what was the take up on my 1/2" emt?......6"
 
chevyx92 said:
I know everyone refers to take up on 1/2" emt as a 5" take up, 3/4" emt a 6" take up and so on. That situation is not always true. You just have to know what your working with. I have bent 1/2" emt with a 3/4" bender plenty of times. And what was the take up on my 1/2" emt?......6"
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Actually, it would be smaller than that. Your "form" is the inner radius of the shoe and takeup measure is basically the outside radius of the resulting bend. For a 6" outside radius on a 3/4 EMT Bender, the inner shoe radius is roughly 5". Wrapping a 1/2 EMT on this shoe would result in an outside bend radius of approximately 5 3/4" due to the difference in cross-sectional OD's.
 
The take up on my Ericksen hand bender is 14" more or less. There are actually three arrows -- one for 1/2", one for 3/4" and one for 1". But then the radius of the bend is always 12".
~Peter
 
I'm confused, what does the deduction required for bending a stub 90 degree bend have to do with the radius of the bend?
 
infinity said:
I'm confused, what does the deduction required for bending a stub 90 degree bend have to do with the radius of the bend?
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Well, generally speaking, the deduction/takeup will always be equal to or greater than the radius ;)

Typically, with hand benders, the deduction/takeup puts the bend mark at the point of tangency on the stub side of the bend.
 
Smart $ said:
Well, generally speaking, the deduction/takeup will always be equal to or greater than the radius ;)

Typically, with hand benders, the deduction/takeup puts the bend mark at the point of tangency on the stub side of the bend.
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How does this relate to the side opposite and adjacent the mark on the bender?
 
Smart $ said:
Well, generally speaking, the deduction/takeup will always be equal to or greater than the radius ;)

Typically, with hand benders, the deduction/takeup puts the bend mark at the point of tangency on the stub side of the bend.
Click to expand...


This is where I see a problem. The deduction measurement is part of the circumference of the bend not the radius. The ratio of the radius of the 90 degree bend to the circumference of the would be 1 to 1.57. A bend with a 15.7" deduction would have a radius of 10".
 
infinity said:
This is where I see a problem. The deduction measurement is part of the circumference of the bend not the radius.
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The radius and circumference are always directly related.

A given radius will always result in the same circumference, it has to or the radius must be variable.
 
A simple saying that I have learned and use in the class is:

Oscar Had A Heap Of Apples

The equates to;
The Sine of the angle is the result of the side Opposite divided by the Hypotenuse (Oscar Had)
The Cosine of the angle is the result of the side Adjacent divided by the Hypotenuse (A Heap)
The Tangent of the angle is the result of the side Opposite divided by the Adjacent (Of Apples)

This is why I asked the question I did after reading this post
Smart $ said:
puts the bend mark at the point of tangency on the stub side of the bend.
Click to expand...
 
jwelectric said:
A simple saying that I have learned and use in the class is:

Oscar Had A Heap Of Apples

Click to expand...

I don't know who Oscar is, we had a fellow named Andy...

Oh hell, another hour of Andy



How about the "magic circles"?
Anyone remember them?
 
iwire said:
The radius and circumference are always directly related.

A given radius will always result in the same circumference, it has to or the radius must be variable.
Click to expand...
Bob I agree 100 % with you here, deductions only change then stub length and no affect what so ever on the radius or circumference of the bend.
 
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