NCT Group 99M, 2000M manual Helical Interpolation G02, G03

4 The Interpolation

The program detail below is an example of how a spiral interpolation (circle of varying radius) can be specified by the use of addresses I, J, K.

G17 G90 G0 X50 Y0

G3 X-20 I-50

Fig. 4.3-6

If the specified circle radius is smaller than half the distance of straight line inter-connecting the start point with the end point, the control will regard the specified radius of the circle as the start-point radius, and will interpolate a circle of a varying radius (spiral), whose center point is located on the straight line connecting the start point with the end point, at distance R from the start point.

G17 G0 G90 X0 Y0

G2 X40 Y30 R10

Fig. 4.3-7

4.4 Helical Interpolation (G02, G03)

The series of instructions will define a helical interpolation.

It is distinguished from circular interpolation that a third axis (q), which is not an axis composing the circular plane. The control performs a simple movement along axis q.

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