line drawn at origin fully constrained, no icon
Your model should be related to the Origin, either directly to it or dimensioned and constrained to it. As you can see in the animated GIF there is not issue with a line to the origin and then moving it. At the end I add a horizontal sketch constraint to the line and still and grab the end and move it.
John Hackney, Retired
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You answered it yourself: " It becomes fully constrained, and I can't move it. I can shorten it via dimensions."
The fact that you can shorten it with dimensions is what is preventing the entire sketch from being constrained. The line is constrained if it starts at the origin and is horizontal or vertical, but the other endpoint of the line is not constrained, which is why you can affect it with a dimension. Add that dimension, and the sketch is fully constrained.
Jeff Strater
Engineering Director
If you have a line sketched from the Origin, you can easily find and delete the Coincident constraint if you select the line, near the origin end, right click and select Delete Constraint from the context menu.
John Hackney, Retired
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@kmanuele wrote:
Lesson? Don't use origin as an origin?
Not quite. What I'll write is not a hard rule as there are always exceptions that yields another method, however any sketch should reference either the sketch origin or geometry projected into the sketch form other sketches, or edges of 3D geometry.
If you don't want to constrain a particular sketch element to the origin, then don't start at the origin as it is clunky to remove, as you have discovered.
