Siemens SINUMERIK 840D sl Programming Manual

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The end point can be programmed in two ways:
1. Directly via Cartesian coordinates
2. Indirectly by specifying an opening angle (also refer to the programming of the opening
angle for circular-path programming)
If the starting point and the end point are in the plane of the basic circle, then, analogous to the
helical interpolation for circles, there is a superimposition to a curve in space.
With additional specification of paths perpendicular to the active plane, an involute can be
traversed in space (comparable to the helical interpolation for circles).
Syntax
INVCW X... Y... Z... I... J... K... CR=...
INVCCW X... Y... Z... I... J... K... CR=...
INVCW I... J... K... CR=... AR=...
INVCCW I... J... K... CR=... AR=...
Meaning
INVCW: Command to travel on an involute in the clockwise direction
INVCCW: Command to travel on an involute in the counter-clockwise direction
X... Y... Z... : Direct programming of the end point in Cartesian coordinates
I... J... K... : Interpolation parameters for defining the center point of the basic circle
in Cartesian coordinates
Note:
The coordinate specifications refer to the starting point of the involute.
CR=... : Radius of the basic circle
Fundamentals
2.9 Motion commands
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 207

Siemens SINUMERIK 840D sl Specifications

General

Control Type	CNC
Number of Axes	Up to 31
Max Number of Channels	10
Interfaces	Ethernet, PROFIBUS, PROFINET, USB
Interpolation	5-axis interpolation
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Display	TFT color display, various sizes
Programming Languages	DIN/ISO
Safety Features	Safety Integrated
PLC	Integrated PLC S7-300
Drive Interface	SINAMICS S120
Data Storage	CF card, USB
Operating System	Windows-based