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Formula for making precise PIE CUT BENDS............!!!!

Fabrication Everything From JBwelded/Fluxcored downpipes to Equal length SS Manifolds.

Formula for making precise PIE CUT BENDS............!!!!

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Old 12-21-2008, 04:47 PM
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Default Re: Formula for making precise PIE CUT BENDS............!!!!

Sorry to dig up an old thread, but I am trying to build an exhaust for my car and had a question about the original formula.

I follow all the math, but am lost as to where the angle of 11* comes from? Wasn't the angle 12 when you divide the bend angle/2x5?

Originally Posted by MADMAX

L = 2.288"
Angle = 11 degrees
_____
Now you need to cut 5 of these -> \____/ with the top part measuring 2.288" in length.




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Old 12-22-2008, 02:55 AM
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Default Re: Formula for making precise PIE CUT BENDS............!!!!

Originally Posted by cutlass84
Sorry to dig up an old thread, but I am trying to build an exhaust for my car and had a question about the original formula.

I follow all the math, but am lost as to where the angle of 11* comes from? Wasn't the angle 12 when you divide the bend angle/2x5?

Thanks for catching that. Funny how no one caught it before.

I meant 12 degrees, not 11. Mistypo.



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Old 12-22-2008, 08:29 PM
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Default Re: Formula for making precise PIE CUT BENDS............!!!!

Cool, thanks for the quick reply man. If I can get my ban saw to cut straight I'll try to post pics of my attempt at this..
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Old 12-22-2008, 11:53 PM
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Default Re: Formula for making precise PIE CUT BENDS............!!!!

Originally Posted by MADMAX
Here is an Excel ------sheet that t_cel_t created that uses this formula for you mathematically challenged individuals. Pie Cut Excel Sheet
I get a virus warning!
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Old 12-23-2008, 04:45 PM
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Default Re: Formula for making precise PIE CUT BENDS............!!!!

its not a virus, unless somehow someone switched it on that server.
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Old 01-26-2009, 05:22 AM
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Default Re: Formula for making precise PIE CUT BENDS............!!!!

thanks for this right up. this will help tons.

HMT ftmfw!!!
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Old 04-16-2009, 12:54 AM
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hell ya was just about to pay 50 for someone to make my down pipe, and $ for intercooler piping. thanks alot.
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Old 08-26-2016, 02:45 AM
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Default There must be a mistake

Either I am right, or I am wrong, but there is a part I feel, is missing. 11*12...11*0.288. How did u get 0.288 from 12?
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Old 04-03-2017, 03:03 PM
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does anyone else have this ------sheet ?
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