Graeme,
Here is a practice that i started doing and it has gotten me out of hot water on more then one occassion.
I always use the center of my material for my X,Y Zero position.
So in case i lose communication or whatever i can always find X,Y Zero even if it has been cut away.
I do a C3 and find 0,0 on my table
I then load my part where i have made a X on it to locate the center of the part.
I then manually move my carriage and find the center of the X on my material with the bit.
I go to the computer screen and write down my X and Y position on the readout
I then Zero X,Y
Then I do a C2 to my material surface. I make sure to have extra material outside the boundries of my cut to Re C2 if needed.
Now if you have any issues or lose position all you have to do is to go back and do a C3
then do a MX (your written down coordinate)
then do a MY (your written down coordinate)
and you are now back to center
Words of Wisdom:
“Words that sink into your ears are whispered…… not yelled”
“The biggest trouble maker you’ll probably ever have to deal with, watches you from the mirror every morn’n”
“The only difference between a rut and a grave is the depth”
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Just remember...when it's time for the hearse to pull up..there's no luggage rack on top!
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The beauty of the Second Amendment is that it will not be needed until they try to take it...Thomas Jefferson