Siemens Sinumerik 840D Operating Turning page 133

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General aspects regarding offsets

The term "Frame" refers to a calculation rule that permits the coordinate

system on the machine to be manipulated.

By means of a programmed instruction the user can, for instance, offset or

scale the specified coordinate system.

Example: N150 TRANS Z-10

N200 ATRANS Z-5

N240 ASCALE X0.5

A = Additive

For the programming of frames the following guidelines apply:

Programmed frames refer always to the last work piece zero point acti-

vated in the program, e.g. G54.

The instruction must be included in a single block.

They will be executed in the sequence in which they appear in the pro-

Instructions that are not preceded by an "A" (e.g. TRANS Z-10) are re-

placing Frames, i.e. they clear all other Frame-instructions used previ-

ously in the program.

The preceding "A" specifies the additive instructions. They enhance all

active Frame-instructions used so far in the program, in other words,

they do not clear anything (e.g. ATRANS Z-5).

All frame-instructions modally operative.

All active Frames (that is a return to the original work piece zero point)

can be cleared in the program by a replacing Frame (e.g. TRANS ), or

by "M30" or manually with "RESET".

840D/828D SINUMERIK Operate

Absolute offset

Incremental offset

Scaling of the X-axis

Scaling factor for the axis

Sinumerik 828d