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Q370 Max. path overlap factor?:
stepover factor k. The TNC calculates the actual
stepover from the second side length (Q219) and
the tool radius so that a constant stepover is used
for machining. If you have entered a radius R2
in the tool table (e.g. tooth radius when using a
face-milling cutter), the TNC reduces the stepover
accordingly. Input range 0.1 to 1.9999
Q207 Feed rate for milling?: Traversing speed of
the tool in mm/min during milling. Input range 0 to
99999.999 alternatively FAUTO, FU, FZ
Q385 Finishing feed rate?: Traversing speed of the
tool in mm/min while milling the last infeed. Input
range 0 to 99999.9999, alternatively FAUTO, FU, FZ
Q253 Feed rate for pre-positioning?: Traversing
speed of the tool in mm/min when approaching
the starting position and when moving to the next
pass. If you are moving the tool transversely to
the material (Q389=1), the TNC moves the tool
at the feed rate for milling Q207 . Input range 0 to
99999.9999, alternatively FMAX, FAUTO
Q200 Set-up clearance? (incremental): Distance
between tool tip and the starting position in the
tool axis. If you are milling with machining strategy
Q389=2, the TNC moves the tool at the set-up
clearance over the current plunging depth to the
starting point of the next pass. Input range 0 to
99999.9999
Q357 Safety clearance to the side? (incremental):
Safety clearance to the side of the workpiece
when the tool approaches the first plunging depth,
and distance at which the stepover occurs if the
machining strategy Q389=0 or Q389=2 is used.
Input range 0 to 99999.9999
Q204 2nd set-up clearance? (incremental):
Coordinate in the spindle axis at which no collision
between tool and workpiece (fixtures) can occur.
Input range 0 to 99999.9999; alternatively PREDEF
HEIDENHAIN | TNC 320 | User's manual for cycle programming | 9/2016
FACE MILLING (Cycle 232, DIN/ISO: G232) 11.7
Maximum
NC blocks
71 CYCL DEF 232 FACE MILLING
Q389=2
;STRATEGY
Q225=+10
;STARTNG PNT 1ST
AXIS
Q226=+12
;STARTNG PNT 2ND
AXIS
Q227=+2.5
;STARTNG PNT 3RD
AXIS
Q386=-3
;END POINT 3RD AXIS
Q218=150
;FIRST SIDE LENGTH
Q219=75
;2ND SIDE LENGTH
Q202=2
;MAX. PLUNGING
DEPTH
Q369=0.5
;ALLOWANCE FOR
FLOOR
Q370=1
;MAX. OVERLAP
Q207=500
;FEED RATE FOR
MILLNG
Q385=800
;FINISHING FEED RATE
Q253=2000;F PRE-POSITIONING
Q200=2
;SET-UP CLEARANCE
Q357=2
;CLEARANCE TO SIDE
Q204=2
;2ND SET-UP
CLEARANCE
11
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