Siemens Sinumerik 840D Operating Turning page 137

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Scaling of the coordinate system

For the explanation of the scaling instruction the machining of similar

washers as in section 2.

These are smaller in both axes. The evaluated scaling factors are 0,737 in

diameter and 0,75 for the Z-axis.

Generally valid formula:

The raw material has a diameter of 30 mm.

The overhang is to be at least 40 mm. Again the parting tool of width 3 mm

The technology remains the same as for washer 1,

only the scaling is added to the program.

In the editor extract the scaling takes place already before the tool change.

N10 G18 G54 G64 LIMS=4000

N20 SCALE X0.737 Z0.737

N40 G00 X300 Z400

N60 G96 S160 F0.2 M4 D1

N70 G00 X44 Z0.2 M8

N80 G01 X-1.6

N100 G00 G42 X14 Z2

N120 X38 RND=1.5

N150 G00 G40 X200 Z300

Care must be taken that the tool carrier now no longer traverses to the

same physical point as in the unscaled coordinate system, since the scal-

ing acts in all directions.

The complete program extract is shown in the summary.

840D/828D SINUMERIK Operate

Scaling factor = Dimension after scaling,

divided by dimension after scaling

28 / 38 = 0,737

; Roughing tool

; Core drill Dm. 16

Sinumerik 828d