G90 & G91, best of both worlds....

Group,

For those writing control software they might consider what is
offered on two of my "commercial professional" controls.

The controls wake up in G90, absolute mode, and there is no need ever
to invoke the G91, incremental mode. Absolute and incremental modes
can be intermixed in the same block. For example, in one of my
controls the incremental coordinates are specified as U,V,W referring
to X,Y,Z, respectively, to indicate an incremental move. "G01 X1.0
V0.5" means move to absolute X1.0, and 0.5 incremetally from the
current Y position. My other controller with this option simply uses
a "/", as in "Y0.5/" to indicate the move is incremental.

This feature is incredibly powerful for MDI, (shop floor
programming). Aside from ease of programming it makes the program
very readable, it's apparent just from looking at a block in question
whether a move is absolute or incremental.

Doug