HEIDENHAIN TNC 620 (34056x-04) Cycle programming - Manual (Page 109)

THREAD MILLING (Cycle 262, DIN/ISO: G262, software option 19) 4.6
4
TNC 620 | User's Manual Cycle Programming | 5/2013
109
Cycle parameters
Nominal diameter Q335: Nominal thread diameter.
Input range 0 to 99999.9999
Thread pitch Q239: Pitch of the thread. The
algebraic sign differentiates between right-hand and
left-hand threads:
+ = right-hand thread
– = left-hand thread Input range -99.9999 to 99.9999
Thread depth Q201 (incremental): Distance
between workpiece surface and root of thread.
Input range -99999.9999 to 99999.9999
Threads per step Q355: Number of thread starts by
which the tool is displaced:
0 = one helix on the thread depth
1 = continuous helix on the complete thread length
>1 = several helix paths with approach and
departure, between these the TNC sets the tool by
Q355 x pitch. Input range 0 to 99999
Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min. Input range 0 to 99999.9999
alternatively
FMAX, FAUTO
Climb or up-cut Q351: Type of milling operation
with M3
+1 = climb
–1 = up-cut
Set-up clearance Q200 (incremental): Distance
between tool tip and workpiece surface. Input range
0 to 99999.9999
Coordinate of workpiece surface Q203 (absolute):
Coordinate of the workpiece surface. Input range
-99999.9999 to 99999.9999
2nd set-up clearance Q204 (incremental):
Coordinate in the spindle axis at which no collision
between tool and workpiece (fixtures) can occur.
Input range 0 to 99999.9999
Feed rate for milling Q207: Traversing speed of
the tool in mm/min while milling. Input range 0 to
99999.999 alternatively
FAUTO
NC blocks
25 CYCL DEF 262 THREAD MILLING
Q335=10 ;NOMINAL DIAMETER
Q239=+1.5 ;THREAD PITCH
Q201=-20 ;THREAD DEPTH
Q355=0 ;THREADS PER STEP
Q253=750 ;F PRE-POSITIONING
Q351=+1 ;CLIMB OR UP-CUT
Q200=2 ;SET-UP CLEARANCE
Q203=+30 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP
CLEARANCE
Q207=500 ;FEED RATE FOR
MILLING