HEIDENHAIN SW 548328-05 - Manual (Page 521)

HEIDENHAIN MANUALplus 620 521
8.2 P
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Global parameters for finished parts
Centric predrilling
Centric predrilling – Tool selection
For predrilling, a maximum of three drilling steps is used:
 1st predrilling step (limit diameter UBD1)
 2nd predrilling step (limit diameter UBD2)
 Finish-drilling step
 Finish-drilling is performed with: dimin <= UBD2
 Tool selection: db = dimin
Designations in the figures at right:
 db1, db2: Drill diameter
 DB1max: Maximum inside diameter for 1st drilling step
 DB2max: Maximum inside diameter for 2nd drilling step
 dimin: Minimum inside diameter
Global parameters for finished parts
Max. inward copying angle [EKW]
Tolerance angle for recess areas, used for distinguishing
turning from recessing (mtw = contour angle).
 EKW > mtw: Relief turn
 EKW <= mtw: Undefined recess (no form element)
Tool selection
1st drilling diameter limit [UBD1]
 1st predrilling step: if UBD1 < DB1max
 Tool selection: UBD1 <= db1 <= DB1max
2nd drilling diameter limit [UBD2]
 2nd predrilling step: if UBD2 < DB2max
 Tool selection: UBD2 <= db2 <= DB2max