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GeneralLogicConfiguration(Config
Many Mach 3 users are very confused about the CV settings and how they affect machine
motion. Maybe I can shed some needed light on the topic :)
General Logic Configuration (Config - General Config...)
-Motion Mode (Constant Velocity OR Exact Stop)
Constant Velocity “CV” – This mode attempts to maintain a constant velocity during
ALL angular or arc moves while obeying the acceleration parameter. This is not possible
during some moves...such as single axis moves that change direction (i.e. Motion must
stop at some point during these moves). On moves where constant velocity can be
maintained, the corners will be rounded depending on how high the acceleration is set
combined with the CV Distance Tolerance (see below) . Higher accelerations and
smaller CV Distance Tolerance values will result in tighter corners and lower following
errors. Note, this is NOT the same as servo following error and has nothing to do with
PID control. Servo/Stepper following errors will be slightly WORSE than the CV
induced following error depending on how “tight” the servo loop is. Stepper motors will
lag as well (+- 1 full step), and will lose steps if pushed too far (VERY BAD).
Exact Stop – This mode accelerates and decelerates to each “point” in the gcode. Mach-3
only sees one move at a time and usually machines run somewhat rough and very slowly
in this mode. Exact stop should only be used where a machine must not round any
corners (inside or outside). However, remember that most CAM software will output
many tiny G01 moves to form arcs. In exact stop mode this type of movement will leave
very bad surface finishes and can be hard on tooling and machine components.
-General Configuration (LookaHead____ Lines)
Only applicable in CV mode. This determines how far “down the road” Mach-3s motion
planner is looking. Setting this to a low number is like driving your car while being very
nearsighted. A high setting is like 20/20 vision and using bin
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