HEIDENHAIN TNC 620 Programming Station

Programming contours | Path contours – Polar coordinates
Helix
A helix is a combination of a circular motion defined in polar
coordinates and a linear motion perpendicular to this plane. Program
the circular path in a main plane.
As an alternative, you can superimpose a circular contour defined in
Cartesian coordinates on a linear motion.
Further information: "Superimposing a linear motion on a circular
contour", Page 164
Application
Large-diameter internal and external threads
Lubrication grooves
Calculating the helix
To program a helix, you must enter the total angle through which the
tool is to move on the helix in incremental dimensions, and the total
height of the helix.
Thread revolutions n: Thread revolutions + thread overrun at
the start and end of the thread
Total height h: Thread pitch P times thread revolutions
n
Incremental total angle
IPA:
Thread revolutions x 360° + angle for
beginning of thread + angle for thread
overrun
Starting coordinate Z: Pitch P times (thread revolutions +
thread overrun at start of thread)
Shape of the helix
The table below illustrates in which way the shape of the helix is
determined by the work direction, direction of rotation and radius
compensation.
Internal thread Work direction Direction of rotation Radius compensation
Right-hand
Left-hand
Z+
Z+
DR+
DR–
RL
RR
Right-hand
Left-hand
Z–
Z–
DR–
DR+
RR
RL
External thread
Right-hand
Left-hand
Z+
Z+
DR+
DR–
RR
RL
Right-hand
Left-hand
Z–
Z–
DR–
DR+
RL
RR
5
HEIDENHAIN | TNC620 | Klartext Programming User's Manual | 01/2022
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