Yaskawa YASNAC PC NC Programming Manual - Manual (Page 20)

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YASNAC PCNC Programming Manual Chapter 1: Programming Basics
1.2 BASICS OF FEED FUNCTION
This section describes the feed function that specifies feedrate (distance per minute, distance per
revolution) of a cutting tool.
1.2.1 Rapid Traverse
Rapid traverse is used for positioning (G00) and manual rapid traverse (RAPID) operation. In the
rapid traverse mode, each axis moves at the rapid traverse rate set for the individual axes; the
rapid traverse rate is determined by the machine tool builder and set for the individual axes by
using parameters. Since the axes move independently of each other, the axes reach the target
point at different time. Therefore, the resultant tool paths are not a straight line generally.
The rapid traverse override function can adjust the set rapid traverse rate to F
0
, 25%, 50%, and
100% where F
0
indicates a fixed feedrate set for parameter pm2447.
1. Rapid traverse rate is set in the following units for the individual axes.
Setting units of rapid traverse rate 1 mm/min
0.1 inch/min
1 deg./min
2. The upper limit of the rapid traverse rate is 240,000 mm/min. Since the most appropriate
value is set conforming to the machine capability, refer to the manuals published by the
machine tool builder for the rapid traverse rate of your machine.
1.2.2 Cutting Feed (F Command)
The feedrate at which a cutting tool should be moved in the linear interpolation (G01) mode or
circular interpolation (G02, G03) mode is designated using address character F.
• With a 6-digit numeral specified following address character F, feedrate of a cutting
tool can be designated in units of “mm/min”.
• The feedrate specified using an F code can be multiplied by 1/10 by changing the set-
ting for parameter pm2004 D0. The programmable feedrate range is indicated in
Table 1.2.2.1
Table 1.2.2.1: Programmable Range of F Code
Input System
Normal Mode (pm2004 DO=O) F-command 1/10 Function (pm2004 DO = l)
Format
Programmable Range
(Feed per Minute)
Format
Programmable Range
(Feed per Minute)
Microns F60 F1.0-F 24000 mm/min F61 F0.1-F 24000.0 mm/min
Sub Microns F51 F0.1-F 24000.0 mm/min F52 F0.01-F 24000.00 mm/min
Sub Sub-microns F42 F0.01-F 2400.00 mm/min F43 F0.001-F 2400.000 mm/min
Inches F41 F0.1-F 9448.8 inch/min F42 F0.01-F 9448.81 mm/min