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Old 11-10-2011, 10:58 PM   #1
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Default 45 Degree offset formula

We all know that 1.41 or 1.414 is the formula for figuring your 45 offset.

BUT!....let's say your working with 3/4" copper pipe. You got to offset 45 degrees. Lets say a 10 inch offset. So, we come up with 14.14.

Nobody on here ever gives the numbers you must deduct for the fitting.

Back to the question. We are working with 3/4 pipe. We got a 10" offset. Our travel piece is 14.14

What will the actual length be when you deduct the fittings?

I am amazed at how many know the offset formula, but still physically hold the pipe up to the 45's and have to make another cut because they do not know how to deduct for the fitting(s)
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Old 11-10-2011, 11:20 PM   #2
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Quote:
Originally Posted by swedishcharm21 View Post
We all know that 1.41 or 1.414 is the formula for figuring your 45 offset.

BUT!....let's say your working with 3/4" copper pipe. You got to offset 45 degrees. Lets say a 10 inch offset. So, we come up with 14.14.

Nobody on here ever gives the numbers you must deduct for the fitting.

Back to the question. We are working with 3/4 pipe. We got a 10" offset. Our travel piece is 14.14

What will the actual length be when you deduct the fittings?

I am amazed at how many know the offset formula, but still physically hold the pipe up to the 45's and have to make another cut because they do not know how to deduct for the fitting(s)
Your travel piece is 14 1/8" strong minus " for the fittings, and no, I won't turn that into decimals for you.
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Old 11-10-2011, 11:24 PM   #3
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Killer, nice to meet you by the way. I know the answer to this. But to clarify for those who do not, are you deducting 3/4" for each fitting or total?
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Old 11-10-2011, 11:25 PM   #4
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3/4 copper should be eyeballed....stop wastin time and get the pipe run, its getting close to lunch.......perspective please
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Old 11-10-2011, 11:28 PM   #5
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Stillaround....tell that to an apprentice who needs to know this when they perform a copper pratical at the journeyman exam......they would fail if they 'eyeballed". Eyeballing it does not cut it.

Since you are into eyeballing.........tell us all how you deduct your fitting for a 13.5" offset with 3 " PVC Sch40. Actual length of travel piece, minus fittings. And what exactly did you deduct for those fittings.

You are helping all the greenhorns out by the way....Thanks
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Old 11-10-2011, 11:34 PM   #6
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Two sharkbites and loop some pex.
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Old 11-10-2011, 11:36 PM   #7
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Chris connor........Your fired!! LOL! I hear ya buddy.
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Old 11-11-2011, 01:01 AM   #8
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3/4 is the deduction for both fittings combined ....3/8 for each ..... You can measure it on the fitting if you don't know it or don't have a take off book....
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Old 11-11-2011, 01:17 AM   #9
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First convert to fractions. 14.14. You take .14 x 8 = 1.12 since .12 is under .50 you drop it ( if it wer above .50 you would round up and add a 1 to the whole number) so now you have 1 witch you just put over whatever number you multiplied it by I always use 8. But 16 or 32 work great also So 1/8 = .14. You have. 14 1/8 ". Now take off 3/4 .... 3/8 per fitting( if I remember rite I always check the fitting) 14 1/8 - 3/4 = 13 3/8. That is your cut length!!!!
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Old 11-11-2011, 08:16 AM   #10
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And after all that, go to the truck and grab the coupling.................
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