HEIDENHAIN TNC 620 User Manual page 471

Useful configurations for the machine tool operator:
In order to improve the structure of large NC programs, use the
TNC's structuring function
Further Information:
Use the TNC's commenting function in order to document NC
programs
Further Information:
Use the comprehensive cycles of the TNC available for the
machining of drill holes and simple pocket geometries: See the
Cycle Programming User's Manual
For fits, output the contours with RL/RR tool radius
compensation. This makes it easy for the machine operator to
make necessary compensations
Further Information:
Separate feed rates for pre-positioning, machining, and
downfeeds, and define them via Q parameters at the beginning
of the program
NC example blocks with variable feed-rate definitions
1 Q50 = 7500 ; POSITION FEED RATE
2 Q51 = 750 ; FEED RATE FOR PLUNGING
3 Q52 = 1350 ; FEED RATE FOR MILLING
...
25 L Z+250 R0 FMAX
26 L X+235 Y-25 FQ50
27 L Z+35
28 L Z+33.2571 FQ51
29 L X+321.7562 Y-24.9573 Z+33.3978 FQ52
30 L X+320.8251 Y-24.4338 Z+33.8311
...
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
"Structuring programs", page 172
"Adding comments", page 169
"Tool compensation", page 220
Running CAM programs 12.6
12
471