Positional Data; Programming Dimensions - Siemens sinumerik 808d Programming And Operating Manual

Address Significance
STOPFIFO Stops the fast
machining step
STARTFIFO Start of fast
machining step
STOPRE Preprocessing
stop
1.2

Positional data

1.2.1

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 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
● Absolute dimension, X=AC(value) only this value applies only for the stated axis and is
● Absolute dimension, X=CC(value) directly approaching the position by the shortest route,
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
Value assignments
revocation by G91 in a following block.
not influenced by G90/G91. This is possible for all axes and also for SPOS, SPOSA
spindle positionings, and interpolation parameters I, J, K.
only this value applies only for the stated rotary axis and is not influenced by G90/G91.
This is also possible for SPOS, SPOSA spindle positionings.
Information
Special function;
filling of the buffer memory until
STARTFIFO, "Buffer memory
full" or "End of program" is
detected.
Special function;
the buffer memory is filled at the
same time.
Special function; the next block
is only decoded if the block
before STOPRE is completed.
Programming principles
1.2 Positional data
Programming
STOPFIFO; separate
block, start of filling
N10 X...
N20 X...
N30 X...
STARTFIFO ;separate
block, end of filling
STOPRE ; separate block
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