PVC Pipe and Fittings Library: Difference between revisions
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The default pipe length is 1ft. This is an arbitrary choice. When I use a macro, it will store the last length used by the user. | The default pipe length is 1ft. This is an arbitrary choice. When I use a macro, it will store the last length used by the user. | ||
= | =Elbows= | ||
Useful links: [https://www.aetnaplastics.com/site_media/media/attachments/aetna_product_aetnaproduct/204/PVC%20Sch%2040%20Fittings%20Dimensions.pdf] | Useful links: [https://www.aetnaplastics.com/site_media/media/attachments/aetna_product_aetnaproduct/204/PVC%20Sch%2040%20Fittings%20Dimensions.pdf] | ||
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== Pipes == | == Pipes == | ||
To create Pipes 40 and 80 Schedule PVC pipes [[File:pvc-pipe-nps.fcmacro]] | To create Pipes 40 and 80 Schedule PVC pipes [[File:pvc-pipe-nps.fcmacro]] | ||
[[File:pvc-pipe-nps-macro-screenshot.png]] | |||
[[File:pvc-pipe-nps-macro-screenshot.png|thumb]] | |||
== Ellbows == | == Ellbows == | ||
(Experimental) | (Experimental) | ||
Run [[File:create-elbow.fcmacro]] with parameters G, H and M from a table. | Run [[File:create-elbow.fcmacro]] with parameters G, H and M from a table. | ||
[[File:create-elbow-macro-screenshot.png]] | |||
[[File:create-elbow-macro-screenshot.png|thumb]] | |||
[[File:90-deg-elbow-screenshot.png]] | |||
[[File:90-deg-elbow-screenshot.png|thumb]] | |||
Revision as of 20:26, 10 December 2017
Pipes
The dimensions of the PVC pipes can be found here PVC_Pipe. Wikipedia on Nominal Pipe Size (NPS) [1],
We will use following guide line for position of a pipe: put one end (base) of the pipe onto the x-y plane. The center of the base has coordinate (0,0,0). The other end points to the positive direction of the z-axis.
Rationale: This is the same way FreeCAD places a new cylinder. We mimic the FreeCAD behavior for UI consistancy.
The default pipe length is 1ft. This is an arbitrary choice. When I use a macro, it will store the last length used by the user.
Elbows
Useful links: [2]
Simple general elbows
This is an intermediate solution. Here I do not follow particular NPT-Standards. Later I will translate the NPT-Parameters in these general dimensions.
To create general elbow with 6 Parameters:
- alpha - angle of the elbow.
- R1 - inner radius of the bending part.
- R2 - inner radius of the elbow.
- R3 - outer radius of the elbow parts.
- L1 - length of one part part of the elbow.
- L2 - length of the another part of the elbow.
I had problems to join all parts of the elbow in FreeCAD. The solution was to make the bent part a little bit smaller. Probably the problem was caused by having many common or coplanar faces of the parts. See [3].
90° - Degree.
Described by 3 dimensions: size, G,H,M. Other dimensions are derived from NPS pipe-dimensions.
Notations
- O.D. - outer diameter.
- Average I.D. - average inner diameter (why average?). This dimension determines the size of the pipe.
- Min. Wall - thickness of the pipe wall.
- Schedule - determines (indirectly) the thickness of the wall.
Notes
"O.D." = "Average I.D."+2"Min. Wall"
Gallery
SCH40 1/8" PVC pipe - size:5kb - FreeCAD -File:Pvc-pipe-nps-sch40-1d8.fcstd,
Elbow test file - size:5kb - FreeCAD -File:Pvc-elbow-test-60deg.fcstd
Macros
Pipes
To create Pipes 40 and 80 Schedule PVC pipes File:Pvc-pipe-nps.fcmacro
Ellbows
(Experimental) Run File:Create-elbow.fcmacro with parameters G, H and M from a table.
How to create a pipe macro
Steps to create GUI: The original instruction are taken from [[4]] but I (Ruslan) have problems with them. I adjusted them to FreeCAD.
- Create with QT Designer a Dialog based on QDialog class. Save the name for example add-nps-pvc-pipe-dialog.ui
- Convert add-nps-pvc-pipe-dialog.ui to python code running
- pyside-uic add-nps-pvc-pipe-dialog.ui -o pipe-dialog.py
- or call
- pyside-uic --indent=0 add-nps-pvc-pipe-dialog.ui -o pipe-dialog.py
- to use tabs as indention.
- If you use the FreeCAD macro editor, pay attention that the indention of pyside-uic and of the editor are the same.
- Insert content of the methods setupUi(self, Dialog) and retranslateUi(self, Dialog) from pipe-dialog.py (How can I insert here a block of python code?) into your macro file.