Programming A Sample Workpiece - Siemens SINUMERIK 840Di sl Programming Manual

2.3

Programming a sample workpiece

The programming of the individual operation steps in the NC language generally represents
only a small proportion of the work in the development of an NC program.
Programming of the actual instructions should be preceded by the planning and preparation
of the operation steps. The more accurately you plan in advance how the NC program is to
be structured and organized, the faster and easier it will be to produce a complete program,
which is clear and free of errors.
Programming
Clearly structured programs are a particular advantage if you need to make changes at a
later date.
Since workpieces differ in shape and form, it is not advisable to create every program using
exactly the same method. There are certain methods, which have proven to be successful in
most instances. A sort of "checklist" can be found below.
Procedures
• Prepare the workpiece drawing
• Define machining sequence
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
– define the workpiece zero
– Draw in the coordinate system
– Calculate any missing coordinates
– Which tools are used when and to machine which type of contour?
– In what order are the individual elements of the workpiece machined?
– Which individual elements repeat (possibly rotated) and should therefore be included
in a subprogram?
– Can you use part contours or similar elements, which already exist in other
subprograms or subroutines?
Where is it advisable or necessary to perform zero offset, rotation, mirroring or scaling
(frame concept)?
Fundamental Principles of NC Programming
2.3 Programming a sample workpiece
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