HEIDENHAIN MANUALplus 4110 - Manual (Page 342)

342 6 DIN Programming
6.15 Thr
ead Cy
cles
Tapered API thread G352
This cycle cuts a tapered single or multi-start API thread. The depth of
thread decreases at the overrun at the end of thread.
Parameters
 X end point of thread (diameter value)
 Z end point of thread
 XS starting point of thread (diameter value)
 ZS starting point of thread
 F thread pitch
 U thread depth
„ U>0: Internal thread
„ U<=0: External thread (lateral surface or front face)
„ U= +999 or –999: Thread depth is calculated
 I maximum infeed —default: I is calculated from the thread pitch and
the thread depth.
 A feed angle (default: 30°):
Range: –60° < A < 60°
„ A>0: Infeed on right thread flank
„ A<0: Infeed on left thread flank
 D number of thread starts (default: 1)
 W taper angle (default: 0°): Range: –45° < W < 45°
 WE run-out angle (default: 12°):
Range: 0° < WE < 90°
 J remaining cutting depth (default: 1/100 mm)
Internal or external threads: See algebraic sign of "U."
Proportioning of cuts: The first cut is performed at the cutting depth
defined for "I" and is reduced with each cut until the tool reaches the
"remaining cutting depth J."
Handwheel superposition (provided that your machine is equipped
accordingly): The superposition is limited to the following range:
„ X direction: Depends on the current cutting depth; the starting and
end points of the thread are not exceeded.
„ Z direction: No more than one turn; the starting and end points of
the thread are not exceeded.
Definition of taper angle: XS/ZS, X/Z, or XS/ZS, Z, W, or
ZS, X/Z, W
Example: G352
%352.nc
[G352]
N1 T45 G97 S1500 M3
N2 G0 X13 Z4
N3 G352 X16 Z-28 XS13 ZS0 F1.5 U-999
WE12
END
„ "Cycle STOP" becomes effective at the end of a thread
cut.
„ The feed rate and spindle speed overrides are not
effective during cycle execution.
„ Handwheel superposition is activated with a switch
located on the machine operating panel.
„ Feedforward control is switched off.