Dimensions in the tool axis -3 – HEIDENHAIN TNC 407 (280 580) ISO Programming User Manual
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8-3
8
Cycles
TNC 426/TNC 425/TNC 415 B/TNC 407
Cycle call
The following cycles become effective automatically as soon as they are
defined in the part program:
• Coordinate transformation cycles
• Dwell time cycle
• SL cycles which determine the contour and the global parameters
All other cycles must be called separately. Further information on cycle
calls is provided in the descriptions of the individual cycles.
If the cycle is to be executed after the block in which it was called, program
the cycle call
• with G79
• with miscellaneous function M99.
If the cycle is to be executed after every positioning block, it must be called
with miscellaneous function M89 (depending on the machine parameters).
M89 is cancelled with
• M99
• G79
• A new cycle definition
Prerequisites:
The following data must be programmed before a cycle call:
• Blank form for graphic display
• Tool call
• Positioning block for starting position X, Y with tool radius compensation G40
• Positioning block for starting position Z (setup clearance)
• Direction of spindle rotation (miscellaneous functions M3/M4)
• Cycle definition
Dimensions in the tool axis
The dimensions for the tool axis are always referenced to the position of
the tool at the time of the cycle call, and are interpreted by the control as
incremental dimensions. It is not necessary to program G91.
The control assumes that the tool is located at clearance height over the workpiece at the beginning of the cycle
(except for SL cycles of group II).