
7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL B-63783EN-1/01
- 706 -
Restrictions
- Conditions under which look-ahead acceleration/deceleration before interpolation
are performed
Even when look-ahead acceleration/deceleration before interpolation
mode are specified, look-ahead acceleration/deceleration before
interpolation are not performed if any of the following conditions is
satisfied:
- The system is in threading mode.
- The system is in feed-per-revolution mode (G95).
- The system is in tapping mode (G93).
- The system is in a canned cycle (other than G80).
- No move command is issued.
- The machine is positioning the spindle
- One-shot G code other than G38, G45, G46, G47, G48, G39, and
G09
- Positioning (G00, G60)
- Block with an alarm
In look-ahead acceleration/deceleration before interpolation mode, the
following functions cannot be executed. To execute any of the
following functions, cancel look-ahead acceleration/deceleration
before interpolation mode, execute the desired function, then set look-
ahead acceleration/deceleration before interpolation mode again.
- Cs contour axis control function
- Hypothetical axis interpolation function
- Electronic gear box function (EGB)
- Setting of acceleration/deceleration, and feedrate
Upon executing a command that requires an acceleration time of one
second or longer if look-ahead acceleration/deceleration before
interpolation is performed, the specified feedrate may not be reached.
By setting "1" for parameter FCC (bit 7 of No. 1517), the feedrate can
be increased. If it is increased, however, the interpolation precision
may decrease in curve interpolation such as circular and NURBS
interpolation.