Codes and Settings
M38 SSV ON
M39 SSV OFF
Setting 165, SSV VARIATION (RPM), lets you vary the RPM.
Setting 166, SSV CYCLE (0.1) SECS, lets you set the amount of time, in tenths of a second, that it takes the RPM to vary. A value of 30 in this setting equals 3 seconds.
Before you begin:
- Make sure that Setting 165, SSV VARIATION (RPM), is set to 100.
- Make sure that Setting 166, SSV CYCLE (0.1) SECS, is set to 25.
Type in this code:
G97 S1000 M03
M38 (SSV ON)
G04 P30. (dwell for 30 seconds)
M39 (SSV OFF)
G04 P30. (dwell for 30.seconds)
Press CYCLE START.
When the program reaches the M38 command, the RPM rises to 1100 and falls to 900 within 2.5 seconds repeatedly for a period of 30 seconds, as defined by the G04 P30. command.
After the 30-second dwell, the M39 command returns the RPM to 1000 with no fluctuations.
The best combination of RPM and time tested to date are:
Setting 165 - 20 RPM
Setting 166 - 30 (3 seconds)
Setting 165 - 30 RPM
Setting 166 - 50 (5 seconds)
Carbide can withstand plus or minus 20 RPM without damaging the insert.
Results will vary based on the tool and workpiece material.