Bance wrote: ↑Mon Apr 22, 2024 9:46 am Attach it to the sketch for that pocket, mode concentric.....

You've got me ...
How does one attach anything to a sketch?

The image in my post comes from the "Parts" file. The "000" file is the Assembly. The error seems to be in the "Parts" file.
The error is more clearly seen in the Assembly.

OS: Windows 10 Version 2009 Word size of FreeCAD: 64-bit Version: 0.20.2.29603 (Git) Build type: Release Branch: releases/FreeCAD-0-20 Hash: 930dd9a76203a3260b1e6256c70c1c3cad8c5cb8 Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3 Locale: English/Australia (en_AU) Installed mods: * Assemb...

OS: Windows 10 build 19045 Word size of FreeCAD: 64-bit Version: 0.22.0dev.36331 (Git) Build type: Release Branch: main Hash: eb5a1b333946ce4ac8a4ead835cba8bdcf602a87 Python 3.10.13, Qt 5.15.8, Coin 4.0.2, Vtk 9.2.6, OCC 7.6.3 Locale: English/New Zealand (en_NZ) Installed mods: * A2plus 0.4.62 * Ass...

Hmmm. :| Here, at the Far End of the World, we miss out on the news. This is, indeed NEW since Zolko posted to a thread I was working a couple of days ago. Perhaps I might print the post and frame it. One day it might be worth something on Amazon. "Zolko's Last Post!" :lol: I trust he will...

Thanks for the offer @ppemawm.

This is the backyard mechanic's version Close inspection will reveal that it is not perfect but I think the principle is proven.
Thanks to all for their help on this journey.

Thanks for taking the time to have a look. I could not solve the issue while inserting things from Bodies into Assembly . I fixed the problem the other way around to your solution. I recreated the Bodies in the Assembly and did away with the referencing involved in importation. You copied the Spread...

This should be the one. You will probably have to cut the date_stamp out of the file name to get it to behave.

(Funny, I thought I had sent it. )

In the end I got round the problem by creating a new set of files actually in the assembly. No exceptions then.

So, ... there TWO of us confounded. ;) Whatever the cause, the effect was to raise an Exception when a Part or Body is being loaded into an Assembly. Ghastly experience tells me that ignored exceptions cause untraceable problems further down the track. In short, they are not a good idea. Can anyone ...

Please see caption on image walker3: I did. I couldn't make any sense of it. (See below.) . The next step is to assemble the first link from the drive link to the triangle. Before we can do this though we need to import two reference points, one on the drive link body (Point1) and the other on the ...