Operation Manual

HEIDENHAIN CNC PILOT 640 277
4.6 Thread and undercut cycles
Thread cycle (longitudinal)—expanded
Call the thread-cutting menu
Select thread cycle
Press the Expanded soft key
 On: Inside thread
 Off: Outside thread
This cycle cuts a single or multi-start external or internal thread. The
thread starts at the starting point and ends at the end point of
thread (without a thread run-in or run-out).
Cycle parameters
X, Z Starting point of thread
Z2 End point of thread
F1 Thread pitch (= feed rate)
D Threads per unit (default: 1 single-start thread)
U Thread depth – No input:
 Outside thread: U=0.6134*F1
 Inside thread: U=–0.5413*F1
I Maximum infeed
 I<U: First cut with cutting depth I; further cuts: reduction
of cutting depth
 I=U: One cut
 No input: I is calculated from U and F1
GK Run-out length
G47 Safety clearance (siehe Seite 140)
G14 Tool change point (siehe Seite 140)
T Turret pocket number
ID Tool ID number
S Spindle speed/cutting speed
GH Type of offset
 0: Without offset
 1: From left
 2: From right
 3: Alternately left/right