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| "Cope cut" layout in large diameter pipe http://coloradoclassicbroncos.com/viewtopic.php?f=4&t=7394 |
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| Author: | Woodscaper [ Wed Apr 08, 2015 7:26 pm ] |
| Post subject: | "Cope cut" layout in large diameter pipe |
Anybody have short cuts on layout and cutting a 90 degree cope/saddle cut in a 20" diameter .250 wall pipe? I have the cutting tools, just need layout advice. Thanks. |
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| Author: | JGZ [ Wed Apr 08, 2015 9:19 pm ] |
| Post subject: | Re: "Cope cut" layout in large diameter pipe |
Cut out a 20" circle on poster board ,lay that down and trace it. |
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| Author: | Dirtheadz [ Thu Apr 09, 2015 2:37 pm ] |
| Post subject: | Re: "Cope cut" layout in large diameter pipe |
I thought their used to be a formula for large pipe, something like 1/4 of the diameter. Hell... I really did drop out & become a statistic, when I thought I wanted to be a mechanical engineer. |
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| Author: | Woodscaper [ Thu Apr 09, 2015 4:31 pm ] |
| Post subject: | Re: "Cope cut" layout in large diameter pipe |
Here is a formua: X = (R1/Sin (JA)) - (((R1 - Sqr(R1^2-(Cos ( AP ) * R2)^2)) / Sin(JA)) + ((Tan (90 - JA) * (Sin(AP) * R2)))) R1 = large radius R2 = small radius JA = Joint Angle AP = AnglePosition I also found a method of laying out a pattern. |
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| Author: | Unaweep [ Sun Apr 12, 2015 8:40 am ] |
| Post subject: | Re: "Cope cut" layout in large diameter pipe |
You can purchase paper templates at your welding store, they aren't expensive and will last a lifetime and work on many sizes of tube/pipe and various degrees/angles. Erik |
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