NCT Group 2000M, 99M manual G90 X50 Y80 Z40

1Introduction

Absolute Coordinate Specification When absolute coordinates are specified, the tool travels a distance measured from the origin of the coordinate system, i.e., to a point whose position has been specified by the coordinates.

The code of absolute data specification is G90.

The block

G90 X50 Y80 Z40

will move the tool to a point of the above position, irrespective of its position before the command has been issued.

Fig. 1.2-6

Incremental Coordinate Specification In the case of an incremental data specification, the control system will interpret the coordinate data in such a way that the tool will travel a distance measured from its instantaneous position.

The code of incremental data specification is G91. Code G91 refers to all coordinate values. The block

G91 X70 Y-40 Z-20

will move the tool over the above distance from its previous position.

An incremental data may be defined to be referred to a single coordinate as well. Standing behind the address of the coordinate, character I refers to the incremental specification of the given coordinate value.

In block

Fig. 1.2-7

G90 XI-70 Y80 Z40

the data of X is interpreted as an incremental value, whereas data Y and Z are - for code G90 - interpreted as absolute coordinates.

Modal Functions

Some codes are effective until another code or value is specified. These are modal codes. E.g., in program detail

N15 G90 G1 X20 Y30 F180

N16 X30

N17 Y100

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