HEIDENHAIN CNC Pilot 4290 - Manual (Page 370)

7 Parameters 358
7.5 Mac
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Continued
AWG – Definition of approach mode: Respective machining
parameters;Tool change position: Defined tool change point
■ 2: Moving to tool change position with G14.
■ 3: Moving to a calculated change position with G0 – TURN PLUS
uses the current and subsequent tool to calculate the optimum
change position
■ Speed limitation [SMAX]: Global speed limitation – You can define
a lower speed limitation in the TURN PLUS program head (see
”
6.2.2 Program Head”).
Global safety clearance
■ External on blank [SAR] – Safety distance on the outside blank
■ Internal on blank [SIR] – Safety distance on the inside blank
■ External on machined part [SAT] – Safety distance on the outside
premachined workpiece contour
■ Internal on machined part [SIT] – Safety distance on the inside
premachined workpiece contour
TURN PLUS takes account of SAR/SIR for all rough-turning cycles
and for centric predrilling.
SAT/SIT on the premachined parts apply to:
■ Finish-machining
■ Recess turning
■ Contour recessing
■ Recessing
■ Thread cutting
■ Measuring
3 – Centric predrilling
Centric predrilling - tool selection, allowances
For predrilling, a maximum of three drilling steps is used:
■ 1st predrilling step (diameter limit UBD1)
■ 2nd drilling step (diameter limit UBD2)
■ Finish-drilling step
■ 1st drilling diameter limit [UBD1]
■ 1st predrilling step, where UBD1 < DB1max
■ Tool selection: UBD1 <= db1 <= DB1max
■ 2nd drilling diameter limit [UBD2]
■ 2nd predrilling step, where UBD2 < DB2max
■ Tool selection: UBD2 <= db2 <= DB2max
■ Finish drilling is performed with: dimin <= UBD2
■ Tool selection: db = dimin