HEIDENHAIN TNC 360 ISO Programming - Manual (Page 170)

8-17
8 Cycles
TNC 360
8.3 SL Cycles
Fig. 8.14: Infeeds and distances with the
ROUGH-OUT cycle
A
B
C
D
Fig. 8.15: Tool path for rough-out
D
α
ROUGH-OUT G57
Process
Cycle G57 specifies the cutting path and partitioning.
• The tool is positioned in the tool axis above the first infeed point, taking
the finishing allowance into account.
• Then the tool penetrates into the workpiece at the programmed feed
rate for pecking.
Milling the contour:
• The tool mills the first subcontour at the specified feed rate, taking the
finishing allowance into account.
• When the tool returns to the infeed point, it is advanced to the next
pecking depth.
This process is repeated until the programmed milling depth is reached.
• Further subcontours are milled in the same manner.
Roughing out pockets:
• After milling the contour the pocket is roughed out. The stepover is
defined by the tool radius. Islands are jumped over.
• If necessary, pockets can be cleared out with several downfeeds.
• At the end of the cycle the tool returns to the setup clearance.
Required tool
This cycle requires a center-cut end mill (ISO 1641) if the pocket is not
separately pilot drilled or if the tool must repeatedly jump over contours.
Input data
• SETUP CLEARANCE A
• MILLING DEPTH B
• PECKING DEPTH
C
• FEED RATE FOR PECKING:
Traversing speed of the tool during penetration.
• FINISHING ALLOWANCE D :
Allowance in the working plane (positive number).
• ROUGH-OUT ANGLE α :
Feed direction for roughing out. The rough-out angle is relative to the
angle reference axis and can be set such that the resulting cuts are as
long as possible with few cutting movements.
• FEED RATE:
Traversing speed of the tool in the working plane.
Machine parameters determine whether
• the contour is first milled and then surface machined, or vice-versa
• the contour is milled conventionally or by climb milling
• all pockets are first roughed out to the full milling depths and then
contour milled, or vice-versa
• contour milling and roughing out are performed together for each
pecking depth.