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Thread: rolling offsets

  1. #1
    Join Date
    Sep 2011
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    wisconsin
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    209

    rolling offsets

    is there a website you guys could give for formulas on figuring rolling offsets , now i am not talking about 3/4 pipe but doing this on 4 inch emt. making mistakes can be costly so I want to be able to figure it out and i cant measure it daignoly I have rise and how much over measurements. I cant seem to find a conduit bending section on this website there should be.

  2. #2
    Join Date
    Jan 2008
    Location
    Littleton, CO
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    264
    Just mark it out on the floor and wall with a pencil and measure.

  3. #3
    Join Date
    Feb 2003
    Location
    Huntsville Alabama
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    Figure out what you need on a piece of 1/2" and transfer your results to your 4"
    Some people are like slinkies. They serve absolutely no useful purpose. But still put a smile on your face when pushed down a flight of stairs.

  4. #4
    Join Date
    Mar 2011
    Location
    Wisconsin
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    158
    Quote Originally Posted by masterinbama View Post
    Figure out what you need on a piece of 1/2" and transfer your results to your 4"
    +1 ! By far the easiest, least costly and most accurate method, especially for 4".

    You could measure down an over then find the hypotenuse, but any mistakes in that method will cause a bad offset and require a calculator that does Sq. root. A piece of 1/2 emt can be tweaked to fit then either measure the offset or match it.

  5. #5
    Join Date
    Feb 2003
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    Huntsville Alabama
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    There is a way to do it with an old style wooden ruler but it can't be explained, it has to be visually demonstrated.
    Some people are like slinkies. They serve absolutely no useful purpose. But still put a smile on your face when pushed down a flight of stairs.

  6. #6
    Join Date
    Jun 2003
    Location
    NE (9.1 miles @5.07 Degrees from Winged Horses)
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    Quote Originally Posted by masterinbama View Post
    There is a way to do it with an old style wooden ruler but it can't be explained, it has to be visually demonstrated.
    Let us know when you post the video. I was never trained in the method, but managed in a crude fashion.

    Folding ruler, test light kit with seriesed lamps, and for the geek I was, a slide rule. I gave them up in reverse order.
    Tom
    TBLO

  7. #7
    Join Date
    Dec 2004
    Location
    Fort Collins, CO NEC: 2011
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    15,322
    Quote Originally Posted by buddhakii View Post
    Just mark it out on the floor and wall with a pencil and measure.
    That's the way I do it.

  8. #8
    Join Date
    Mar 2003
    Location
    Maryland
    Posts
    100
    I think the formula for rolling offsets is A sq + B sq = C sq rt

    For instance 8" offset but need to roll 3" to left or right

    8X8= 64 3X3=9
    64+9 = 73
    73 sq rt =8.544"

  9. #9
    Join Date
    Dec 2011
    Location
    Ocala, Florida, USA
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    888
    Quote Originally Posted by tommy View Post
    I think the formula for rolling offsets is A sq + B sq = C sq rt

    For instance 8" offset but need to roll 3" to left or right

    8X8= 64 3X3=9
    64+9 = 73
    73 sq rt =8.544"
    I have never calculated a rolling offset, but my spidey sense confirms your formula. Simple enough, since the rise (8") and the side slip (3") are two sides of a traingle with a right angle between and the desired length is the hypotenuse, then Pythagorean's theorum is correct.


    I know what I don't know, and I know where to go to find it!

  10. #10

    phone apps

    search online for iphone apps...Master Bender $3.99 willl do rolling offsets
    android electrical wiring pro $2.99
    etc

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