Siemens SINUMERIK 840D sl Function Manual page 1730

Detailed description
2.1 Path feedrate F
Based on the programmed cutting rate S
actual value of the transverse axis (radius r), the control system uses the following formula to
determine the spindle speed:
π = Circle constant
Diameter programming and reference axis for several transverse axes in one channel:
One or more transverse axes are permitted and can be activated simultaneously or
separately:
• Programming and displaying in the HMI operator interface in the diameter
• Assignment of the specified reference axis with SCC[AX] for a constant cutting rate G96,
References:
/FB1/ Function Manual Basic Functions; Transverse Axes (P1)
Example
Example
S
G96
• 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 or G962 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 $MC_DIAMETER_AX_DEF (geometry axis with transverse axis function )
The function G96, G961 or G962requires that the machine zero and the workpiece zero of
the transverse axis are in the turning center of the spindle.
14
G961, G962
= 230 m/min
, either (S ) or (S
Speed G96
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
) and the partoriented
G961
Basic logic functions: Feeds (V1)