HEIDENHAIN CNC Pilot 4290 - Manual (Page 141)

HEIDENHAIN CNC PILOT 4290 129
4.7 T
u
rning Cy
cles
Recessing cycle G866
G866 generates a recess defined by G22-Geo. The CNC PILOT uses
the tool definition to distinguish between external and internal
machining, or between radial and axial recesses.
Calculation of the cut segmentation (SBF: see machining
parameter 6): maximum offset = SBF * width of cut
Parameters
NS:
Block number (reference to G22-Geo)
I: Allowance (with precutting)—default: 0
■ I=0: Recess is machined in one run
■ I>0: Precutting is carried out in the first run; and finishing in
the second
E: Dwell time—no input: Corresponds to a spindle revolution
■ With I=0: For each recess
■ With I>0: Only during finishing
Cutter radius compensation is active.
Oversizes are not taken into account.
Cycle run
1 Calculate the proportioning of cuts.
2 Approach workpiece for first pass from starting
point (radial recess: first in Z, then in X direction;
axial recess, first in X, then in Z direction).
3 Execute the first cut according to ”I.”
4 Return at rapid traverse and approach for next
pass.
5 I=0: ”E” period of dwell.
6 Repeat 3 to 4 until the recess has been machined.
7 I>0: Finish-machine the contour.