bendin parallel offset

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d1reyad

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i wanted to know if you have say 4 3/4 conduit running the same way on a wall with a offset of 4 inch how to bens all the offset so the space between stay the same the space from one conduit is 2 in center to center of conduit because if i bens them all the same offset they dont line up poper
 
Bend two scrap pieces to find the difference in length required to keep the 2" spacing. Then add that length to the first mark you make for each bend.
 
d1reyad said:
i wanted to know if you have say 4 3/4 conduit running the same way on a wall with a offset of 4 inch how to bens all the offset so the space between stay the same the space from one conduit is 2 in center to center of conduit because if i bens them all the same offset they dont line up poper
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Depends on your bend angle.

Take bend angle and divide by two (2).

Obtain trigonometric tangent value for this result.

Multiply the value by the CL-CL distance.

The result is how much you have to advance or retract progressive offsets.​

For example:

30? ? 2 = 15?

tan 15? = 0.268

0.268 ? 4" centers = 1.072"​

Depending on which way the parallel offset has to sit, you would either add or subtract 1 1/32" from the bend mark measurement of the previous piece. Don't forget that this assumes your conduits start at points perpendicular (square) in the run. If they are uneven, you will have to add or subtract that difference accordingly.
 
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infinity said:
Bend two scrap pieces to find the difference in length required to keep the 2" spacing. Then add that length to the first mark you make for each bend.
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Smart $ said:
Depends on your bend angle.
Take bend angle and divide by two (2).

Obtain trigonometric tangent value for this result.

Multiply the value by the CL-CL distance.

The result is how much you have to advance or retract progressive offsets.​
For example:
30? ? 2 = 15?

tan 15? = 0.268

0.268 ? 4" centers = 1.072"​
Depending on which way the parallel offset has to sit, you would either add or subtract 1 1/32" from the bend mark measurement of the previous piece. Don't forget that this assumes your conduits start at points perpendicular (square) in the run. If they are uneven, you will have to add or subtract that difference accordingly.
Click to expand...

Hmmm. Which method to use? :wink:
 
I believe this was recently discussed at length in the "Electrical Instructors" section w/the post titled "Paralel Bends"
 
infinity said:
Bend two scrap pieces to find the difference in length required to keep the 2" spacing. Then add that length to the first mark you make for each bend.
Click to expand...

I would do it like Rob with scrap or just make your first set a bit long, cut to fit and note the difference in length.
 
Or, the easiest of all: make your offsets, lay them out on a flat surface and adjust them how you want them, then mark the ends even using a straightedge, and cut at the marks.

Sure, it's a little wasteful, but for only four pipes, why not?
 
d1reyad said:
i wanted to know if you have say 4 3/4 conduit running the same way on a wall with a offset of 4 inch how to bens all the offset so the space between stay the same the space from one conduit is 2 in center to center of conduit because if i bens them all the same offset they dont line up poper
Click to expand...

check out this site, and also there are some good books on this too.

http://www.porcupinepress.com/_bending/ParallelBends.htm
 
LarryFine said:
Or, the easiest of all: make your offsets, lay them out on a flat surface and adjust them how you want them, then mark the ends even using a straightedge, and cut at the marks.

Sure, it's a little wasteful, but for only four pipes, why not?
Click to expand...

That's another fool proof method if you're using EMT and not using threaded conduit. Cutting and re-threading the ends would make that a much more lengthy process, but as you said it's only four conduits.
 
infinity said:
That's another fool proof method if you're using EMT and not using threaded conduit. Cutting and re-threading the ends would make that a much more lengthy process, but as you said it's only four conduits.
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Geesh! I'd have the difference figured out before you guys got your first piece of conduit bent.

I guess in this case "simple" is a relative term.
 
Smart $ said:
Geesh! I'd have the difference figured out before you guys got your first piece of conduit bent.

I guess in this case "simple" is a relative term.
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I don't know Smart, you laid it out pretty easy. I think I'll print your post out and I keep a calculator in the truck, so I'll have to try your method.:wink: Not having to cut and ream pipe, or thread it too if it's rigid, is a huge benefit to me.

I'm itchin' to see if the calcs work.....:smile:
 
Cow said:
I don't know Smart, you laid it out pretty easy. I think I'll print your post out and I keep a calculator in the truck, so I'll have to try your method.:wink: Not having to cut and ream pipe, or thread it too if it's rigid, is a huge benefit to me.

I'm itchin' to see if the calcs work.....:smile:
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Oh it definitely works :)

The web page at the link brother posted is the same method... only it explains how it works.
 
Hey Smart, would this guy have anything to do with how you see the world of pipe?

9998210143.jpg

Best little book on conduit bending I ever ran into (or bent around:))
 
Smart $ said:
Geesh! I'd have the difference figured out before you guys got your first piece of conduit bent.

I guess in this case "simple" is a relative term.
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In real life, though, small differences in the bends and differences in the hardness of the metal make the methods (for EMT anyway) that determine the differences after the bends have been made a better choice.
 
Rockyd said:
Hey Smart, would this guy have anything to do with how you see the world of pipe?
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Only in the sense that I bought his book[let] as a reference. Skimmed through it when I received it. Did not discover anything I didn't already know. Yet I do concur that it is a good instrucitonal aid for someone who does not know how to bend conduit, or as a reference for one who infrequently bends conduit.
 
K8MHZ said:
In real life, though, small differences in the bends and differences in the hardness of the metal make the methods (for EMT anyway) that determine the differences after the bends have been made a better choice.
Click to expand...

You're entitled to your opinion. ;)
 
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