Calculator will calculate the necessary dimensions for the construction flat pattern segments lobsterback bend elbow tee piece frustum cone and truncated pipe truncated cone with an accessible vertex and triangulation method Truncated Pipe Layout or Pipe cut at any angle Flat Pattern Pipe to Cone intersection at Perpendicular to Axis Flat Pattern Pipe Truncated by Radius Flat Pattern Full Cone Layout Flat Pattern Rectangle to Round or Square to Round Transition layout Flat Pattern Round to Rectangle or Round to Square transition layout Flat Pattern.
Truncated Pyramid Layout Flat Pattern.
Screw Flight Layout Flat Pattern.

app for those who are working in Pressure vessels fabrication process equipment fabrication welding Piping Insulation Ducting heavy Equipment fabrication Storage tank Agitators Mechanical equipment structures industrial fabrication heat ex changers etc.

Added the function of saving the development to a DXF file. Export the flat pattern as a dxf file then you can open it with any CAD program like Acad. You can use the dxf file to cut the sheet on a laser or cnc machine.
On the phone you can open AutoCAD DWG FastView SchemataCAD viewer DWG/DFX AutoDWG DWGSee.