HEIDENHAIN NC 124 - Manual (Page 71)

6 Programming Workpiece Positions
TNC 124 71
6
Programming Workpiece Positions
Entering workpiece positions
For many simple machining processes it is often sufficient to simply
describe the workpiece to be machined by the coordinates of the po-
sitions to which the tool should move.
There are two possibilities of entering these coordinates in a
program:
• Keying in the coordinates with the keyboard, or
• Transferring the tool position with the Teach-In function
Entries for a complete part program
Having the TNC execute a machining process requires more than
entering coordinates in a program. A complete part program requires
the following data:
• A BEGIN block and an END block (automatically generated by
the TNC)
• Feed rate F
• Miscellaneous function M
• Spindle speed S
• Calling the tool with TOOL CALL
Entering feed rate F, miscellaneous function M, spindle speed S and
TOOL CALL
in a part program is described in Chapter 5.
Important information on programming and machining
The following information is intended to help you in quickly and easily
machining the programmed workpiece.
Movements of tool and workpiece
During workpiece machining on a milling or drilling machine, an axis
position is changed either by moving the tool or by moving the ma-
chine table on which the workpiece is fixed.
Pre-positioning
Pre-position the tool to prevent the possibility of damaging the
tool or workpiece. The best pre-position lies on the extension of the
tool path.
Feed rate F and spindle speed S
Adjust the feed rate F and spindle speed S to your tool, workpiece
material and machining operation.
The TNC then calculates the feed rate F and spindle speed S with
the INFO function (see Chapter 12).
In the appendix you will find a diagram which will aid you in
selecting the appropriate feed rate F for tapping.
When entering tool movements in a part program you
always program as if the tool is moving and the work-
piece is stationary.