
19.HIGH-SPEED CUTTING FUNCTIONS PROGRAMMING B-63944EN/02
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- Deceleration
Deceleration starts in advance so that the feedrate programmed for a
block is attained at the beginning of the block.
Deceleration can be performed over several blocks.
Feedrate
Time
Deceleration
start point
Deceleration
start point
Speed control by look-ahead
acceleration/deceleration before
interpolation
Programmed speed
- Deceleration based on a distance
If the total distance of the blocks read ahead becomes shorter than or
equal to the deceleration distance obtained from the current feedrate,
deceleration starts.
If the total distance of the blocks read ahead during deceleration
increases, acceleration is performed.
If the blocks of a small amount of travel are successively specified,
deceleration and acceleration may be performed alternately, making
the feedrate inconsistent.
To avoid this, decrease the programmed feedrate.
- Function for changing time constant of bell-shaped acceleration/deceleration
Bell-shaped acceleration/deceleration before interpolation is
performed using the parameter-set acceleration and acceleration
change time. If a low feedrate is specified, a linear acceleration/
deceleration may not achieve the specified acceleration as shown:
Linear acceleration/deceleration not achieving
specified acceleration/deceleration
Specified
feedrate
T1
Feedrate
T1
T2
Time
T1 : Time obtained from specified feedrate and specified acceleration (specified
feedrate/acceleration (parameter No. 1660))
T2 : Acceleration change time (parameter No. 1772)