I have a few couple of questions

1) It seems that G1 A45 turns CW to 45 degrees, and G1 A-45 turns CCW to the same 45 degree position. I could not find the G-Code documentation, that sign(A-word) is the direction, and abs(A-word) is the position. My Mach3 behaves indeed this way.

The hint is from here (see attached picture): http://www.cnczone.com/forums/mach_software_artsoft_software/163474-gcode_turn_axis_ccw.html#post1172380

Tool path window really rotates, as from this hint: (Mach3 and 4th Axis topic) https://www.machsupport.com/forum/index.php/topic,15220.msg101823.html#msg101823

2)  In any case, is it possible to tell Mach3 to use B as the 4th axis (preparatory question, should I need it):  because our post processor seems to treat, by default, the A axis as vertical-linear, and the B axis as horizontal wrap-around. That's what I have read in the postprocessor code (I could not verify whether mentioning of vertical/horizontal refers to the spindle axis or the 4th axis). The question is very preparatory, as I have yet to see the piece to be machined.


Peter.
I'm the IT man (running Mach3 on a virtual Windows8-32bit on a real Windows8 laptop. There is a real machine in the shop)

3) Jogging the 4th axis does not reflect in the tool path window, it is not the same as G0 A~ or G1 A~ (whilst jogging X, Y, Z is shown in the tool path window).

4) Homing/Limits in A seem not rotary, or cannot be disabled individually. With (365;-5) I did run into soft limits on A. I set them to very large and small values (9999999999; -9999999999).