"Greg has done a lot of work on this correcting possible problems that could occur, depending on the current Mach settings in force when the script is envoked and perhaps the best for me has been the addition of the G90 to this line Code "G90 G31 Z -15 F" &ProbeFeed 'Probing move at ProbeFeed rate."
Is this line to be added or changed in the blue screen mods that I downloaded? I haven't made any changes to what I installed. What effect does the G90 code have in this instance?
"Other related factors (which have been well discussed on the Zone) include residue on the tool shank or in the collet, partially insulating the tool from ground and also how good is the earth connection of the spindle shaft through its bearings ?."
Don't think its a Mach setting issue, as it worked 99% of the time.
My spindle is double insulated from the frame; therefore I have a stiff battery clip that I apply to the collet. You can see it on the URL given in the first post. As I said, this is clipped and tested to see the green "LED" light come on on the screen, and once it does, the Z setter button is clicked, so while a poor connection might be possible, I believe its highly unlikely.
At any rate, this method of setting the Z has proven to be unreliable for me, so I've gone to a different method that is just as easy, but without risk. It also works with tips that are non conductive like pens, diamond point engravers, etc.
My game controller is a wired USB, not wireless.