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IDProjectCategoryView StatusLast Update
0004781FreeCADBugpublic2021-11-08 14:42
Reportervectronic Assigned To 
Status newResolutionopen 
PlatformIntelOSMacOSOS Version11.6
Product Version0.20 
Summary0004781: Issue with Linear Pattern in the Part Design workbench when replicating an Additive Pipe based on an elliptical path.
DescriptionI am trying to use Linear Pattern to duplicate a flange on a pin. The flange is created using an additive pipe which uses a path sketch involving an ellipse.

This doesn't work.

I have queried in the forum to see if this was:

- a known bug (doesn't seem to be)
- more experienced users can get it to work (they can't)
- more experienced users thought it might be a bug (they do)

Forum link:

I have taken my sample from the forum, improved it based on their feedback and simplified it a lot more. I have also included a comparison of using a circle (instead of an ellipse) for the additive pipe path and this seems to work fine with the linear pattern feature.

In the linear-pattern-attempt-1.FCStd you will see:

  • attempt-1-01.png : Linear pattern of a pin and a flange based on a circular path is rendered.
  • attempt-1-02.png : Another flange based on an elliptical path is added to the first pin.
  • attempt-1-03.png : When another linear pattern for the elliptical flange is added, the result is not as expected.

In the linear-pattern-attempt-2.FCStd you will see:

  • attempt-2-01.png : A pin with a circular flange and elliptical flange is created first.
  • attempt-2-02.png : If I try to create a linear pattern involving all of these at once (the pin, the circular flange and the elliptical flange) the linear pattern dialog displays an unexpected error.
  • attempt-2-03.png : The final result is not as expected.

Steps To ReproduceOpen the linear-pattern-attempt-1.FCStd file and observe that:

- the linear pattern using the feature of an additive pipe based on a circle path sketch IS rendered.
- the linear pattern using the feature of an additive pipe based on an ellipse path sketch IS NOT rendered.


Open the linear-pattern-attempt-2.FCStd file and observe that the linear pattern including both additive pipes is rendered incorrectly.sketch is not rendered.
Additional InformationScreenshots:

Sample models:

TagsPart Design
FreeCAD InformationOS: macOS 10.16
Word size of FreeCAD: 64-bit
Version: 0.20.Unknown
Build type: Release
Python version: 3.9.7
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.3
Locale: C/Default (C)



2022-03-03 13:55

administrator   ~0017112

This ticket has been migrated to GitHub as issue 6281.

Issue History

Date Modified Username Field Change
2021-11-08 14:41 vectronic New Issue
2021-11-08 14:42 vectronic Tag Attached: Part Design