Problem 1: I programmed a G3 in the XZ plane (G18), and the mill performed a clockwise arc. In order to get a counter-clockwise arc, I had to program a G2. It seems to me that if you’re facing the front of the mill, the clockwise direction is pretty obvious. Can somebody explain to me why Mach3 seems to think it’s the other way?
Iincidentally, some drawings of how to program incremental arcs (including signs for the center offsets) would be really helpful.
Problem 2: It took me a while to figure out that ‘Incremental IJ Mode’ affects all three planes. You're probably going to say, “Well, of course it does.” Once I figured that out, I realized that the user’s guide says so. However, I was coming from using the old Bridgeport Boss 5 controller, where you can only have absolute IJ mode in the XY plane. The XZ and YZ planes are incremental only. So therefore, when I saw the term ‘Absolute/Incremental IJ mode’, I assumed it only affected the XY plane. I think it should be called ‘Absolute/Incremental IJK Mode’, or even better, ‘Absolute/Incremental Arc Center Mode’.
Problem 3: Mach3 retains absolute/incremental and plane settings until the next run, even if the computer was re-started. You're probably going to say, “Well, of course it does.” However, some machines start up in a standard mode, so you don't have to worry about canceling out whatever weird mode you were using last time. Mach3's General Configuration page has check-boxes for plane and absolute/incremental 'IJ' mode. Sillly me, I thought checking those would make them the default start-up options. Sure, it's a good idea to always completely initialize your setup, but I don't recall noticing in the user's guide a warning that Mach3 retains these settings from run to run.
These are not serious problems, except that you need to figure them out before you can proceed. I assume the objective is to have a short learning curve, not to force people to achieve 'guru' status before they can get on with cutting metal.