Detailed Description
2.1 Path feedrate F
Feeds (V1)
2-6 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Based on the programmed cutting rate S
Speed
, either (S
G96
) or (S
G961
) and the part-oriented
actual value of the transverse axis (radius r), the control system uses the following formula to
determine the spindle speed:
6
6SHHG
Q
U
π = Circle constant
Example
S
G96
= 230 m/min
• Where r = 0.2 m ! n = 183.12 rpm
• Where r = 0.1 m ! n = 366.24 rpm
⇒ The smaller the workpiece diameter, the higher the speed.
For G96,G961 a geometry axis must be defined as the transverse axis.
The transverse axis, whose position affects the speed of the mater spindle, is defined using
channel-specific machine data:
MD20100 DIAMETER_AX_DEF
(geometry axis functioning as transverse axis).
The function G96,G961 requires that the machine zero and the workpiece zero of the
transverse axis are in the turning center of the spindle.
Constant speed (G97, G971)
G97,G971 deactivates the "Constant cutting rate function" (G96, G961) and saves the last
calculated spindle speed. With G97, the feedrate is interpreted as a revolutional feedrate (as
with G95).
When programming G971, linear feedrate is selected (as with G94). The feedrate F is
interpreted in mm/min or inch/min.
When G97, G971 is active, an S value can be reprogrammed to define a new spindle speed.
This will not modify the cutting rate programmed in G96, G961.
G97,G971 can be used to avoid speed variations in movements along the transverse axis
without machining (e.g., cutting tool).
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