Note
SVC programming is not possible if the following spindle feedrate movements are active:
● Constant cutting speed: G96/G961/G962 S... (Page 98)
● Constant grinding wheel peripheral speed: SUG (Page 103)
● Position spindle: SPOS/SPOSA/M19 (Page 117)
● ; Switch master spindle over to axis mode: M70 (Page 117)
Conversely, programming one of these functions will effect a deselection of SVC (tool cutting
speed).
Note
Maximum tool speed
System variable $TC_TP_MAX_VELO[<tool number>] can be used to preset a maximum tool
speed (spindle speed).
If no speed limit has been defined, there will be no monitoring.
Note
The tool paths of "standard tools" generated, e.g. using CAD systems which already take the
tool radius into account and only contain the deviation from the standard tool in the tool nose
radius, are not supported in conjunction with SVC programming.
Examples
The following shall apply to all examples: Tool carrier = spindle (for standard milling)
Example 1: Milling cutter 6 mm radius
Program code Comment
N10 G0 X10 T1 D1 ; Selection of milling tool with, e.g.
$TC_DP6[1,1] = 6 (tool radius = 6 mm)
N20 SVC=100 M3 ; Cutting speed = 100 m/min
⇒ Resulting spindle speed:
S = (100 m/min * 1000) / (6.0 mm * 2 * 3.14) =
2653.93 rpm
N30 G1 X50 G95 FZ=0.03 ; SVC and tooth feedrate
...
Example 2: Tool selection and SVC in the same block
Program code Comment
N10 G0 X20
N20 T1 D1 SVC=100 ; Tool and offset data set selection together with
SVC in block (no specific sequence).
N30 X30 M3 ; Spindle start with CW direction of rotation, cut-
ting speed 100 m/min
Fundamentals
2.6 Spindle motion
NC programming
94 Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
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