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Movement Control Commands

3.2 Determining the coordinate value input modes

04.07

3-61

SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition

Supplements to the dimension unit designation commands

S The state when the power is turned ON is determined by MD

$MC_EXTERN_GCODE_RESET_VALUES[5].

S On switchover, the zero offset values are converted completely.

S If the dimension unit system should be switched over during the execution of a

program, the following processing must be accomplished in advance.

If a workpiece coordinate system (G54 t o G59) is being used, return it to the

base coordinate system.

Cancel all tool offsets (G41 to G48).

S After switching over the dimension unit system between G20 and G21, the

following processing must be accomplished.

Execute G92 (coordinate system setting) for all axes before specifying axis

move commands.

S The handwheel and increment weighting are not switched over with G20 and

G21. This switchover is initiated by PLC program in this case. The relevant MD

is $MA_JOG_INCR_WEIGHT.

3.2.3 Scaling (G50, G51)

The shape defined by a part program can be enlarged or reduced according to a

required scale. For the scaling processing, the following G codes are used.

Table 3-5 Scaling G codes

G code

Function Group

G50 Scaling OFF 11

G51 Scaling ON 11

The G50 and G51 blocks must be specified in the manner as indicated above wi-

thout other commands entered in these blocks. The scaling function which is called

by G51 must be canceled by G50. If G51 is specified in the scaling mode, it is dis-

regarded.

Format

T wo different kinds of scaling can be applied.

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