Siemens SINUMERIK 802D User Manual

Programming
10.2 Positional data
Cylindrical grinding
238 Programming and Operating Manual, 07/2009, 6FC5398-4CP10-2BA0
10.2 Positional data
10.2.1 Programming dimensions
In this section you will find descriptions of the commands, with which you can directly
program dimensions taken from a drawing. This has the advantage that no extensive
calculations have to be made for NC programming.
Note
The commands described in this section stand in most cases at the start of a NC program.
The way, in which these functions are combined, is not intended to be a patent remedy. For
example, the choice of working plane may be made at another point in the NC program.
The real purpose of this and all the following sections is to illustrate the conventional
structure of an NC program.
Overview of typical dimensions
The basis of most NC programs is a drawing with concrete dimensions.
When implementing in a NC program, it is helpful to take over exactly the dimensions of a
workpiece drawing into the machining program. These can be:
● Absolute dimension, G90 modally effective applies for all axes in the block, up to
revocation by G91 in a following block.
● Absolute dimension, X=AC(value) only this value applies only for the stated axis and is
not influenced by G90/G91. This is possible for all axes and also for SPOS, SPOSA
spindle positionings, and interpolation parameters I, J, K.
● Absolute dimension, X=CC(value) directly approaching the position by the shortest route,
only this value applies only for the stated rotary axis and is not influenced by G90/G91. Is
also possible for SPOS, SPOSA spindle positionings.
● Absolute dimension, X=ACP(value) approaching the position in positive direction, only
this value is set for the rotary axis, the range of which is set in the machine datum to 0...<
360°.
● Absolute dimension, X=ACN(value) approaching the position in negative direction, only
this value is set for the rotary axis, the range of which is set in the machine datum to 0...<
360°.
● Incremental dimension, G91 modally effective applies for all axes in the block, until it is
revoked by G90 in a following block.
● Incremental dimension, X=IC(value) only this value applies exclusively for the stated axis
and is not influenced by G90/G91. This is possible for all axes and also for SPOS,
SPOSA spindle positionings, and interpolation parameters I, J, K.
● Inch dimension, G70 applies for all linear axes in the block, until revoked by G71 in a
following block.
● Metric dimension, G71 applies for all linear axes in the block, until revoked by G70 in a
following block.

Siemens SINUMERIK 802D Specifications

General

Brand	Siemens
Model	SINUMERIK 802D
Category	Control Unit
Language	English