VARIOUS FUNCTIONS AND
PRECAUTIONS OF Symbolic FAPT
1. VARIOUS FUNCTIONS OF
When a system parameter value or an MTF parameter
value is modified, check the prepared NC data. Machining
with incorrect NC data may result in the tool colliding with the
workpiece and/or machine, or forced machining occurring,
possibly causing damage to the machine and/or tool itself,
or injury to the user.
(1)Setting of parameters
It is required to set the following parameters for outputting the S code.
Processing method for constant surface speed control
1 or 0: NC unit without constant surface speed control function
1 or 3: NC unit with constant surface speed control function
See the following “System parameters” for the difference between
1 and 3.
1102 Number of S code digits
Range selection M code
Set it as needed.
Spindle maximum/minimum speed Set it as needed. However,
always set it if data is set to 1110 – 1113.
Change rate of S code output
Change rate = (ȧS code output this time – S code output last
timeȧ)/S code output last time
If the change rate calculated within the system exceeds the value
of parameter number 1122, the obtained S code is output.
2) System parameters
Bit 0 = 0: Constant surface speed control function is not used
1: Constant surface speed control function is used
Relationship with the MTF 1085:
(1) When bit 0 is equal to 0:
The G97 is output if the parameter number 1085 is equal to 1
(2) When bit 0 is equal to 1:
The G96 is output if the parameter number 1085 is equal to 1.
The G97 is output if the parameter number 1085 is equal to 3.
This parameter is valid only when the MTF 1085 is equal to 1
Spindle maximum speed
If the S code value calculated by the system exceeds the value of
parameter number 128, it is clamped by this value.
S CODE OUTPUT