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Circular path CTP with tangential connection
The tool moves on a circular path, starting tangentially from a
preceding contour element.
Polar coordinates radius PR: Distance from the arc
end point to the pole CC.
Polar coordinates angle PA: Angular position of the
arc end point.
Example NC blocks
12 CC X+40 Y+35
13
X+0 Y+35 R
F250 M3
14
P PR+25 PA+120
15 CTP PR+30 PA+30
16
Y+0
The pole CC is not the center of the contour arc!
Helical interpolation
A helix is a combination of a circular movement in a main plane and
a linear 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:
Thread revolutions n
Total height h
Incremental
total angle IPA
Starting coordinate Z
114
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Thread revolutions + thread overrun at
the start and end of the thread
Thread pitch P x thread revolutions n
Thread revolutions x 360° + angle for
beginning of thread + angle for thread
overrun
Thread pitch P x (thread revolutions +
thread overrun at start of thread)
Y
120°
35
CC
40
Z
Y
CC
6 Programming: Programming Contours
30°
X
X
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