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If the tangent of the previous block does not lie in the active plane, its projection into the active

plane is used.

If the start and end points do not have the same position components perpendicular to the

active plane, a helix is produced instead of a circle.

2.9.7 Helical interpolation (G2/G3, TURN)

The helical interpolation enables, for example, the production of threads or oil grooves.

With helical interpolation, two motions are superimposed and executed in parallel:

● A plane circular motion on which

● A vertical linear motion is superimposed.

Syntax

G2/G3 X… Y… Z… I… J… K… TURN=

G2/G3 AR=… I… J… K… TURN=

G2/G3 AR=… X… Y… Z… TURN=

G2/G3 AP… RP=… TURN=

Meaning

G2: Travel on a circular path in clockwise direction

G3: Travel on a circular path in counter-clockwise direction

X Y Z : End point in Cartesian coordinates

I J K : Circle center point in Cartesian coordinates

Fundamentals

2.9 Motion commands

NC programming

204 Programming Manual, 12/2019, 6FC5398-2EP40-0BA0

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

Siemens SINUMERIK 840D sl Programming Manual

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