https://forums.autodesk.com/t5/fusion-manufacture-forum/clearance-and-retract-heights-and-going-to-z0-first-causes/m-p/7611040#M167186 <P>It's not fusion where the problem is it's in Mach3, I can show you all day&nbsp;my machine going to G28 at the start of the G code then going to the first cut position (Work Zero) same at the end and not crashing or anything bad.</P> <P>&nbsp;</P> <P>It sounds more like Mach3 has pooped itself, you have a offset stuck or a tool change position set, what version of Mach3 are you useing.</P> <P>&nbsp;</P> <P>One thing to try is put in G40 and G49 into the mdi then restart mach3 and putting the G40 and G49 in to the MDI again then home the machine and set the work Zero's and run a g code again with the G28 in it.</P> <P>&nbsp;</P> <P>Do it as an air cut if the machine does not goto Machine Zero at the start where it is in the G code you will have to try doing a overwrite of Mach3 with a fresh copy.</P> Sat, 09 Dec 2017 22:45:28 GMT daniel_lyall 2017-12-09T22:45:28Z