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Old 04-04-2019, 11:44 PM   #1
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Default Offset Bend Up And To The Left

I had to make an offset bend to reach a point 4 inches higher and 5 inches to the left. I used the 6.5" row in the offset bend table to determine 9 3/16 inches between bends for 45 degrees.

I used the 6.5" row because SQRT(4*4 + 5*5) = 6.4

It worked!

I could not find this calculation with a Google search.

Is this really how it's done? If yes, then why do I never see it in conduit tutorials or guides?
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Old 04-04-2019, 11:55 PM   #2
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From what I’ve seen most guides are basic. Even if they get into segment offsets.

Cox has a book for advanced techniques. I never bought it because I was afraid after spending the money there would be nothing new in it.
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Old 04-05-2019, 12:35 AM   #3
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I got Cox's book, I got Benfield's book, I got lots of bending books. I got ADD.

Numbers books might just as well be toilet paper, and then they would be useful to me. Can't remember my own Sister's birthdays. Brain gets stuck.
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Old 04-05-2019, 12:42 AM   #4
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That's the Pythagorean theorem, it's what I always use for rolled offsets. I've never seen it in a conduit book, one of my supervising journeymen taught it to me years ago

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Old 04-05-2019, 02:25 AM   #5
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A rolling offset is just like any other offset. Very seldom do I use the Pythagoream theorem to calculate the depth of a rolling offset, you can just measure it.
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Old 04-05-2019, 07:57 AM   #6
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Find a square corner on something (You know, like, 90 degrees). From the corner measure and mark your offset dimensions along each leg. Measure diagonally between marks. That is your rolling offset depth.
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Old 04-08-2019, 05:43 PM   #7
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I'm pretty sure our apprenticeship conduit bending course book brought up ol' Pythagoras for use with rolling offsets. Not entirely sure, because I used that theorem damn near every time I ran pipe. I tried to get more comfortable with the trig aspects of conduit bending rather than just the basic multipliers and it turns out it's quite a bit more work you don't need to do for every dang bend!

BUT it got me a lot more comfortable with the calculations so I could take 'em apart and use them for things like accurately figuring kicks on the stubby side of the 90, offsets at custom angles etc.
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Old 04-09-2019, 09:04 AM   #8
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Default Maths, go figure

Quote:
Originally Posted by swimmer View Post
Is this really how it's done?

Properly, yes, but just bending the offset by eye and rolling it til it fits can work too.
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Old 04-09-2019, 10:41 AM   #9
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App “iBend Pipe” easy to use & has calculation for rolled offset. Before the app I have measured my up & over- drew it out on the floor - then measured the diagonal.
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