HEIDENHAIN MANUALplus 4110 - Manual (Page 341)

HEIDENHAIN MANUALplus 4110 341
6.15 Thr
ead Cy
cles
Extended longitudinal multi-start thread G351
G351 machines a single or multi-start longitudinal thread (internal or
external thread) with variable pitch. The thread starts at the current
tool position and ends at the "end point X, Z."
Parameters
 Z end 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 —no input: 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)
 J remaining cutting depth (default: 1/100 mm)
 E variable pitch (default: 0)
„ E>0: Increase the pitch per revolution by E
„ E<0: Decrease the pitch per revolution by E
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.
Example: G351
%351.nc
[G351]
N1 T45 G97 S1500 M3
N2 G0 X16 Z4
N3 G351 Z-29 F1.5 U-0.9 I0.2
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.