Question
I've lost my origin point, how do I get it back?
Answer
Every part contains an origin folder, there is a ""Centre Point"" in every origin folder. When you start a new part file, it starts you in a sketch, if you click on the centre point, you can see it (yellow dot) but this point is not yet projected onto your sketch.
To properly constrain objects to the origin, you should project the centre point to your current sketch. To do this, click on the ""Project Geometry"" icon, then expand the origin folder and select the ""Centre Point"". You can now constrain your geometry to the projected centre point.
by Clint Brown