Operation Manual

HEIDENHAIN MANUALplus 620 251
4.5 Recessing cycles
Undercutting type U
Call the recessing cycles
Select undercutting U
This cycle machines an Undercut type U and, if programmed,
finishes the adjoining plane surface. The undercut is executed in
several passes if the undercut width is greater than the cutting width
of the tool. If the cutting width of the tool is not defined, the control
assumes that the tool’s cutting width equals the undercut width.
Either a chamfer or a rounding arc can be machined.
Cycle parameters
X, Z Starting point
X1, Z1 Corner point of contour
X2 End point on plane surface
I Undercut diameter
K Width of undercut
B Chamfer/Rounding
 B>0: Rounding radius
 B<0: Chamfer width
G47 Safety clearance (see page 128)
G14 Tool change point (see page 128)
T Turret pocket number
ID Tool ID number
S Spindle speed/cutting speed
F Feed per revolution
MT M after T: M function that is executed after the tool call T