0004781: Issue with Linear Pattern in the Part Design workbench when replicating an Additive Pipe based on an elliptical path. - FreeCAD Tracker

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ID	Project	Category	View Status	Date Submitted	Last Update

0004781	FreeCAD	Bug	public	2021-11-08 14:41	2021-11-08 14:42

Reporter	vectronic	Assigned To
Priority	normal	Severity	major	Reproducibility	always
Status	new	Resolution	open
Platform	Intel	OS	MacOS	OS Version	11.6
Product Version	0.20

Summary	0004781: Issue with Linear Pattern in the Part Design workbench when replicating an Additive Pipe based on an elliptical path.
Description	I 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: https://forum.freecadweb.org/viewtopic.php?f=3&t=63409 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 Reproduce	Open 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. OR 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 Information	Screenshots: https://f001.backblazeb2.com/file/vectronic-public/freecad/screenshots.zip Sample models: https://f001.backblazeb2.com/file/vectronic-public/freecad/models.zip
Tags	Part Design

FreeCAD Information	OS: 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)

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