ABS Absolute -- that is referenced to a known start point on the
machine or the workpiece.
INC Incremental -- each move starts from where it is as 0, 0, 0
(X, Y, and Z), moved the specified distance, and then considers
where it has landed to be the 0, 0, 0 point for the next move.
Usually in CNC machine commands, though I could imagine using a
DRO in incremental mode for some projects.
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I missed the Staff meeting, but the Memos showed that rodjava
in rec.crafts.metalworking :
ABS - absolute movement, from a set zero point. You move to "grid
location" x,y,z. Distance as the crow flies.
INC - incremental. Movement relative to where you are. You move
"over" in X, Y or Z. Distances if the crow has to walk and carry a
ABS will tell you where you are, relative to where machine Zero is
set. INC will tell you where you are, relative to where you started
Switching these in a DRO will not get you in _as much_ trouble as
switching them when setting up the program. E.G., when you rapid a
head 12 inches in X thinking "move to X12 Y0" when the program is
already at (X6,Y0) and in INC mode ... can you say "Head Crash"boys
and girls? Knew the guy who did just that, and it destroyed the
machine - cost more to fix than the company figured it was worth.
"I had just been through hell and must have looked like death warmed
over walking into the saloon, because when I asked the bartender
whether they served zombies he said, Sure, what'll you have?'"
from I Hear America Swinging by Peter DeVries
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