HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 592)

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Roughing – Tool tolerances
For tool selection, the following applies:
„ Tool angle (EW): EW >= mkw (mkw: ascending contour angle)
„ Tool angle (EW) and point angle (SW): NWmin < (EW+SW) <
NWmax
„ Adjacent angle (RNWT): RNWT = NWmax – NWmin
Roughing – Oversizes
Roughing – Approach and departure
Approach and departure are in rapid traverse (G0).
Tool tolerances
Adjacent angle tolerance [RNWT]
Tolerance range for secondary cutting edge
Relief cutting angle [RFW]
Minimum angle differential between the contour and
secondary cutting edge
Oversizes
Type of oversize [RAA]
„ 16: Longitudinal and transverse oversizes differ – no single
oversizes
„ 144: Longitudinal and transverse oversizes differ – with
single oversizes
„ 32: Equidistant oversize – no single oversizes
„ 160: Equidistant oversize – with single oversizes
Equidistant or longitudinal [RLA]
Equidistant oversize or longitudinal oversize
None or transverse [RPA]
Transverse oversize
Approach and departure
„ Approach – external roughing [ANRA]
„ Approach – internal roughing [ANRI]
„ Departure – external roughing [ABRA]
„ Departure – internal roughing [ABRI]
Approach/departure strategy:
„ 1: Move simultaneously in X and Z directions
„ 2: First X, then Z direction
„ 3: First Z, then X direction
„ 6: Coupled motion; X precedes Z direction
„ 7: Coupled motion; Z precedes X direction