294 ISO Programming
4.22 Drilling and Boring Cycles
Feed rate reduction:
Indexable insert drill and twist drill with 180° drilling angle
A feed rate reduction is only effective if the parameter “Drilling
length A” has been defined.
Other drills
Beginning of hole: Feed rate reduction as programmed in V
End of hole: Reduction as of hole end point—length of first cut—
safety clearance
Length of first cut = tool tip
Safety clearance: See user parameter or G47, G147
Parameter combinations for single holes without contour
description
XS, XE ZS, ZE
XS, K ZS, K
XE, K ZE, K
Cycle run
1 Hole without contour definition: Tool is located at the
starting point (safety distance from the bore hole).
Hole with contour description: Tool moves at rapid traverse
to the starting point:
RB not programmed: Moves up to the safety clearance
RB programmed: Moves to the position RB and then to the
safety clearance
2 Spot drilling. Feed rate reduction depending on V
3 Drilling at feed rate.
4 Through drilling. Feed rate reduction depending on V
5 Retract depending on D at rapid traverse or feed rate.
6 Return position:
RB not programmed: Retraction to the starting point
RB programmed: Retraction to the position RB
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