Cycle Parameters - HEIDENHAIN TNC 620 User Manual

Danger of collision!
To avoid collisions,
Do not program positions in incremental
dimensions immediately after Cycle 25 since they
are referenced to the position of the tool at the
end of the cycle.
Move the tool to defined (absolute) positions in
all main axes, since the position of the tool at the
end of the cycle is not identical to the position of
the tool at the start of the cycle.

Cycle parameters

Milling depth Q1 (incremental): Distance between
workpiece surface and contour floor. Input range
-99999.9999 to 99999.9999
Finishing allowance for side Q3 (incremental):
Finishing allowance in the working plane. Input
range -99999.9999 to 99999.9999
Workpiece surface coordinate Q5 (absolute):
Absolute coordinate of the workpiece surface. Input
range -99999.9999 to 99999.9999
Clearance height Q7 (absolute): Absolute height at
which the tool cannot collide with the workpiece (for
intermediate positioning and retraction at the end of
the cycle). Input range -99999.9999 to 99999.9999
Plunging depth Q10 (incremental): Infeed per cut.
Input range -99999.9999 to 99999.9999
Feed rate for plunging Q11: Traversing speed
of the tool in the spindle axis. Input range 0 to
99999.9999, alternatively FAUTO, FU, FZ
Feed rate for milling Q12: Traversing speed of
the tool in the working plane. Input range 0 to
99999.9999, alternatively FAUTO, FU, FZ
CLIMB OR UP-CUT Q15:
Climb milling: Input value = +1
Conventional up-cut milling: Input value = –1
Climb milling and up-cut milling alternately in several
infeeds: Input value = 0
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015
CONTOUR TRAIN (Cycle 25, DIN/ISO: G125)
NC blocks
62 CYCL DEF 25 CONTOUR TRAIN
Q1=-20 ;MILLING DEPTH
Q3=+0 ;ALLOWANCE FOR SIDE
Q5=+0 ;SURFACE COORDINATE
Q7=+50 ;CLEARANCE HEIGHT
Q10=+5 ;PLUNGING DEPTH
Q11=100 ;FEED RATE FOR
PLNGNG
Q12=350 ;FEED RATE FOR
MILLING
Q15=-1 ;CLIMB OR UP-CUT
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