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Old 06-24-2009, 10:14 PM   #31
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Quote:
Originally Posted by Protech View Post
OK, I'll break it down for ya

See the drawings.

We want to know what "x" is.

First we do the Pythagorean theorem for the simple offset(we want to get "c")

"A" squared plus "B" squared. Then get the Square root of that and you will now know what "C" is.

Now, do the same thing but with "C" and "D" to get "X".

Let's do one together.

From the second drawing we know that "A"=2 and "B"=8 and "D"=7(spread, advance and rise).

2 squared plus 8 squared is 68 and the square root of that is 8.246.

So now that we know "C" is 8.246 we can do that same thing again to get "x" which is our rolling offset.

8.246 squared plus 7 squared is 116.99 and the square root of that is 10.816.

That's your answer, 10.816'.
How is that easier than taking the square root of A squared plus B squared and multiplying it by 1.4142?
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Old 06-24-2009, 10:35 PM   #32
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It isn't.
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Old 06-25-2009, 09:51 PM   #33
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WOW!, this thread still going? Sorry guys, when I first posted this question I needed the info to scratch down fast for a guy who was heading out to take the journeyman's exam.
He has since gone on to Master, steal enough from me to start his own business, build that business up to 983 trucks, go completely insane and the last time anyone saw him was at the R.P.B.O.A.

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Old 06-25-2009, 10:03 PM   #34
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para,
You are one funny guy....
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Old 06-03-2010, 02:10 PM   #35
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Does anyone know the formula for finding the length of pipe (TRAVEL) between two 45"s. Thought I could remember it but I was wrong.
The answer is: Travel = Offset x Constant
The constant for a 45 degree angle fittings 1.4142 (shorten to 1.41)
1) - measure the offset (distance pipe is being moved to new location c-c)
2) - multiple the offset by the constant 1.41
3) - answer is the travel measurement or "the distance between the two 45)
i.e: if the offset is 7 1/2" then T= 7.5 x 1.41 = 9.87 round off to nearest 1/8' T=9 7/8" c-c

Hope this helps. by the way this formulas works for any travel measurement, only thing that changes is the constant being used.

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Old 06-03-2010, 03:14 PM   #36
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Quote:
Originally Posted by aldenphac View Post
The answer is: Travel = Offset x Constant
Quote:
Originally Posted by aldenphac View Post
The constant for a 45 degree angle fittings 1.4142 (shorten to 1.41)
1) - measure the offset (distance pipe is being moved to new location c-c)
2) - multiple the offset by the constant 1.41
3) - answer is the travel measurement or "the distance between the two 45)
i.e: if the offset is 7 1/2" then T= 7.5 x 1.41 = 9.87 round off to nearest 1/8' T=9 7/8" c-cHope this helps. by the way this formulas works for any travel measurement, only thing that changes is the constant being used.
alden

For those interested here are the other constants for regular offsets not
rolling offsets.

Degree ----Constant

60 ---------1.15
45 ---------1.414
30 ---------2.00
22-1/2 -----2.61
11-1/4 -----5.12
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Last edited by PLUMBER_BILL; 06-03-2010 at 03:17 PM..
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Old 06-03-2010, 07:42 PM   #37
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I just ask my apprentice........................
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Old 06-03-2010, 11:17 PM   #38
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i Just Ask My Apprentice........................
Bingo!
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Old 06-03-2010, 11:36 PM   #39
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Here you go more formulas for you guys. http://www.plumbingzone.com/f2/usefu...a-thread-8539/
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Old 06-03-2010, 11:43 PM   #40
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I aced my practical (100) for my journeyman's test, got a 98 on the written.

I thought the copper jig and the lead pour was kid's play. I only got a half hour sleep that night and was having fun with my latest girlfriend that was STACKED!!!!

Damn those were some good times.
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