Operation Manual

HEIDENHAIN CNC PILOT 640 293
4.6 Thread and undercut cycles
Undercut DIN 509 E
Call the thread-cutting menu
Select undercut DIN 509 E.
 Off: When the cycle is completed, the tool remains
at the cycle end position.
 On: Tool returns to the starting point
The cycle machines a thread undercut according to DIN 509 type E, a
cylinder start chamfer, then the adjoining cylinder, and finishes with
the plane surface. You can define a finishing oversize for the area of
the cylinder. The cylinder chamfer is executed when you enter at least
one of the parameters cylinder 1st cut length or 1st cut radius.
Cycle parameters
X, Z Starting point
X1, Z1 Starting point of cylinder
X2, Z2 End point on plane surface
U Grinding oversize for the area of the cylinder (default: 0)
E Reduced feed rate for the plunge cut and the cylinder start
chamfer (default: feed rate F)
I Undercut depth (default: value from standard table)
K Undercut length (default: value from standard table)
W Undercut angle (default: value from standard table)
R Undercut radius on both sides of the undercut (default:
value from standard table)
G14 Tool change point (siehe Seite 140)
T Turret pocket number
ID Tool ID number
S Spindle speed/cutting speed
F Feed per revolution
B Cylinder start chamfer (default: no start chamfer)
WB First-cut angle (default: 45 °)
RB First-cut radius (default: no input = no element): Positive
value = first-cut radius, negative value = chamfer
G47 Safety clearance (siehe Seite 140)—evaluated only if "With
return" is active
MT M after T: M function that is executed after the tool call T.
MFS M at beginning: M function that is executed at the
beginning of the machining step.