In the attached file, there is a vertical datum plane through the center of a rectangular prism. I want to create a datum line along the intersection of this plane with the YZ plane. When I attempt to do that, I get an error, "Attachment mode failed: Attach EngineLine::calculateAttachedPlacemen...

@heron
Not sure how I missed the last part of the discussion...
Anyway, thanks.
Unfortunately, that fix is specific to that drawing.
Changing the order of the loft has no effect on the file below.

Thanks, I see I didn't create a part; originally this was going to just be a simple thing...
Thanks for the verification.

If I start with the attached file and do the following: Create a new body Right click on Sk_Cut2_HoldDown and choose "Move object to other body"; use Body001 and click "OK" then everything in the original body is removed and placed under the part. If instead, I first move the ske...

Thanks both, I was wondering if that might be it.

Just dropping in to say FreeCAD really needs an angle constraint. FreeCAD have an angle constraint. And when you need an equal, just use expressions. Give the first a name, for example x and use it as expression for the other angle.0.png I'm in a situation where I need an equal angle constraint, bu...

garya wrote Not sure I understand what you're saying. It looks like you're in sketcher, but the Measurement tool is inactive in my Sketcher. Can you send a pic and supply the pink banner info. It could be this, go to "Edit-Preferences-Display-Pick radius", set that 9 or 10. Maybe there wa...

chrisb wrote: ↑Mon Nov 15, 2021 12:04 am In Sketcher you can use driven dimensions instead of the measuring tool.

Just learned that, thanks.

edwilliams16 wrote: ↑Sun Nov 14, 2021 11:21 pm Toggling a dimension to "reference" makes it an output instead of an input. Or check "reference".Screen Shot 2021-11-14 at 1.19.34 PM.png

Thanks!