Sketch and bodies origins are shifting from drawing origin

[michaelstanz]

I am getting back into some CNC programming after many years.  I imported (using copy and paste) a drawing I made with an old version of autocad and was very meticulous about aligning it with the origin before I started creating the solid model. Everything seemed to look OK as I was creating the features and bodies.  I noticed when I went to the manufacturing page that the origin of the project was no longer aligned with the sketch and bodies.  This is the second time it has happened with a different drawing.  I have attached a picture which indicates it is offset by .059 and .03.

I can move the sketch over to the project origin but the body really gets out of whack apparently because some of the components I created were not on the sketch.  The pockets in 3 of the spokes don't move.  Why is this happening?  I haven't gotten into the machining yet but when I attempt to drill the center hole the gcode needs to move to X.0 and Y.0

[davebYYPCU · Accepted solution]

There are no short cuts in Fusion, imported sketch would not be constrained to the file / component origin, as default, (building on quicksand has the same effect)

Move and lock (constrain) the sketch to the origin, fully defined sketches are recommended.

When done the features that break will need editing to fix the selections.

Might help.....

[TheCADWhisperer]

@michaelstanz 

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

Your image doesn’t show the most important information - the expanded sketch folder.

With absolute definition of the Origin as datum - all behavior is robust and logically predictable.

[michaelstanz]

That's what I ended up doing.  I found a single point very close to the imported drawing's origin that may have been inadvertently selected as the origin.  There was a lot of cleaning up of tangent circles and chained geometry.