Operation Manual

HEIDENHAIN CNC PILOT 640 281
4.6 Thread and undercut cycles
API thread
Call the thread-cutting menu
Select API thread
 On: Inside thread
 Off: Outside thread
This cycle cuts a single or multi-start API external or internal thread.
The depth of thread decreases at the overrun at the end of thread.
Cycle parameters
X, Z Starting point
X1, Z1 Starting point of thread
X2, 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 1st cutting depth
 I<U: First cut with cutting depth I—further cuts:
reduction of cutting depth down to J
 I=U: One cut
 No input: Calculation from U and F1
WE Run-out angle (range: 0° <= WE < 90°)
W Taper angle (range: –60° < A < 60°)
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
GV Type of infeed
 0: Constant mach. X-section
 1: Constant infeed
 2: W/ remaining cutting (with distribution of remaining
cuts)
 3: W/o remaining cutting (without distribution of
remaining cuts)
 4: Same as MANUALplus 4110
 5: Constant infeed (same as 4290)
 6: Constant with distribute. (same as 4290)