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doran6
01-12-2010, 04:35 PM
hello i copied a question on nov 2009
(1.1414 xoffset) -2 (.414x (clr) centre line radius this is the formula
example degree of elbow: 60=.577
45=.414
30=2.00???????????is.268
example in your situation
45 degree elbow 48x20
(1.414x36 offset)-2(.414x72)
=21.288 thats the length of the duct in between your on your two 45 degree elbow...

my question is: let's say the 48*20 offset of 36" got to fit in 75" space

it might fit for all degree 30,45,60 with any kind of radius

but if i pick 45º and clr and if fit within 75" : i want to know the diaganal lenght between offset plus know the straight at one end to reach 75"

plus even more challenge: have a formula to find the exact degree elbow & clr (ex. 55º & 112"clr)with no straight in between if possible in that case

i've been trying to find that formula for many years

hope you understand my question

thanks

doran6
sheetmetal worker, ottawa, ontario
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tnbndr
01-12-2010, 07:31 PM
The answer to your question is two 51.25 degree bevels with a 24.12 radius
and no straight will give you a 36" offset 75" long.
I am attaching an excel spreadsheet that will show that. Feel free to use it to impress your sheetmetal friends. With excel on a PDA I used to use this in the field to figure these out.
You just need to keep playing with the numbers until you get the length you want. Or input the angle and know how long it will be and allow for the length in a field measure situation.

doran6
01-13-2010, 03:23 AM
thank you very much

will check the download

doran6

Rob
01-13-2010, 02:28 PM
Welcome doran6.
I hope this helps.

http://www.thesheetmetalshop.com/PNphpBB2-viewtopic-t-1607.html

thehammer
01-13-2010, 03:37 PM
The answer to your question is two 51.25 degree bevels with a 24.12 radius
and no straight will give you a 36" offset 75" long.
I am attaching an excel spreadsheet that will show that. Feel free to use it to impress your sheetmetal friends. With excel on a PDA I used to use this in the field to figure these out.
You just need to keep playing with the numbers until you get the length you want. Or input the angle and know how long it will be and allow for the length in a field measure situation.
WOW! Thanks for sharing that!! Sure makes it fast and easy!!!

tnbndr
01-13-2010, 07:02 PM
I have always been about letting technology let us be more productive. Why keep doing things the hard way and using long math formulas over and over. Excel can do that for you. You just have to know how to right the formulas.
When you guys are ready I have a spreadsheet that will also figure out the straights between two bevels, I just have to find it in my archives.