HEIDENHAIN TNC 640 User Manual page 425

Cycles: Turning | RECESSING CONTOUR RADIAL
(Cycle 840, DIN/ISO: G840)
Q505 Finishing feed rate?: Feed rate for
finishing. If M136 has been programmed, the
value is interpreted by the TNC in millimeters
per revolution, without M136 in millimeters per
minute.
Q479 Machining limits (0/1)? : Activate cutting
limit:
0: No cutting limit active
1: Cutting limit (Q480/Q482)
Q480 Value of diameter limit?: X value for
contour limitation (diameter value)
Q482 Value of cutting limit in Z?: Z value for
contour limitation
Q463 Maximum cutting depth?: Maximum infeed
(radius value) in radial direction. The infeed is
divided evenly to avoid abrasive cuts. Input range
0.001 to 999.999
Q507 Direction (0=bidir./1=unidir.)?: Cutting
direction:
0: Bidirectional (in both directions)
1: Unidirectional (in contour direction)
Q508 Offset width?: Reduction of cutting length.
After clearance roughing, the remaining material
is removed with a single cut. If required, the TNC
limits the programmed offset width.
Q509 Depth compensat. for finishing?:
Depending on factors such as workpiece material
or feed rate, the tool tip is displaced during a
turning operation. You can correct the resulting
infeed error with the turning depth compensation
factor.
Q499 Reverse contour (0=no/1=yes)?: Machining
direction:
0: Machining in contour direction
1: Machining opposite the contour direction
HEIDENHAIN | User's manual for cycle programming | 10/2017
NC blocks
9 CYCL DEF 14.0 CONTOUR
10 CYCL DEF 14.1 CONTOUR LABEL2
11 CYCL DEF 840 RECESS TURNG,
RADIAL
Q215=+0 ;MACHINING OPERATION
Q460=+2 ;SAFETY CLEARANCE
Q478=+0.3 ;ROUGHING FEED RATE
Q488=+0 ;PLUNGING FEED RATE
Q483=+0.4 ;OVERSIZE FOR DIAMETER
Q484=+0.2 ;OVERSIZE IN Z
Q505=+0.2 ;FINISHING FEED RATE
Q479=+0 ;CONTOUR MACHINING
LIMIT
Q480=+0 ;DIAMETER LIMIT VALUE
Q482=+0 ;LIMIT VALUE Z
Q463=+2 ;MAX. CUTTING DEPTH
Q507=+0 ;MACHINING DIRECTION
Q508=+0 ;OFFSET WIDTH
Q509=+0 ;DEPTH COMPENSATION
Q499=+0 ;REVERSE CONTOUR
12 L X+75 Y+0 Z+2 FMAX M303
13 CYCL CALL
14 M30
15 LBL 2
16 L X+60 Z-10
17 L X+40 Z-15
18 RND R3
19 CR X+40 Z-35 R+30 DR+
18 RND R3
20 L X+60 Z-40
21 LBL 0
12
425