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Helical interpolation, 5 p a th cont ours — p o lar coor dinat e s – HEIDENHAIN TNC 406 User Manual

Page 134

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HEIDENHAIN TNC 406, TNC 416

113

6.5 P

a

th Cont

ours — P

o

lar Coor

dinat

e

s

Helical interpolation

A helix is a combination of a circular movement in a main plane and a
liner movement perpendicular to this plane.

A helix is programmed only in polar coordinates.

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.

For calculating a helix that is to be cut in a upward direction, you need
the following data:

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.

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

Number of revolutions times 360° + angle for
beginning of thread + angle for thread
overrun

Starting coordinate Z

Pitch P times (thread revolutions + thread
overrun at start of thread)

Internal thread

Work
direction

Direction

Radius
comp.

Right-handed
Left-handed

Z+
Z+

DR+
DR–

RL
RR

Right-handed
Left-handed

Z–
Z–

DR
DR+

RR
RL

External thread

Right-handed
Left-handed

Z+
Z+

DR+
DR–

RR
RL

Right-handed
Left-handed

Z–
Z–

DR
DR+

RL
RR

Y

X

Z

CC

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