We use E codes so they are easy to spot on a program. Since we are using -4 controls (88hs) editing a G numbered code can be tiresome for a novice operator if they type in g; and then the control just removes the first g code and then if you type in g54 it will take the place of the next g code in the line. Its a quirky thing trying to explain to guys what exactly you have to do to get the right code on the screen
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We have had good luck with our Fadals milling mostly soft steel and aluminum up to 5 axis. We are always looking for spare parts
If you have a broken down Fadal give a shout.