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Feed Function (F Function)
This determines the feed rate for the workpiece and the spindle.
The feed rate generally varies according to the cutting parameters (such as the spindle speed, tool diameter, and workpiece material).
Format
F feed rate
Parameter
feed rate
Description
The feed rate is specified as a real or integer value following the "F."
The setting made on the PNC-3200 determines whether the F function is performed simultaneously with specification or after comple-
tion of the block in which the specification is made.
For millimeter input
F120.0
Feed rate set at 120 mm/min.
F120000
Feed rate set at 120 mm/min. (in 0.001 mm/min. units)
For inch input
F5.0
Feed rate set at 5 inch/min.
F50000
Feed rate set at 5 inch/min. (in 0.0001 inch/min. units)
If a speed exceeding the maximum speed is specified, the maximum speed is set. In the same way, the minimum speed is set if the
specified speed is less than the minimum speed.
The feed rate which is actually used is determined in a stepwise manner on the PNC-3200. The actual feed rate is either 0.5 mm/sec., or
from 1 to 30 mm/sec. (in steps of 1 mm/sec.). The equivalent per-minute speeds are 30 mm/min. and from 60 to 1,800 mm/min. (in
steps of 60 mm/min.).
When the feed rate parameter is set to 0, operation is at a speed of 30 mm/min.
The specified value is rounded down to the nearest multiple of 60.
Examples:
Command
F70.0
F119.0
F120.0
Operation is similar for inch input, except that the millimeter values are converted to inches.
Function
Feed rate
Operating speed (mm/min.)
60
60
120
Acceptable range
Range 1
Effective range
0—1800 [mm/min.]
0—70.87 [inch/min.]
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