Operation Manual

HEIDENHAIN CNC PILOT 640 251
4.5 Recessing cycles
Type of machining for technology database access: Recess turning
By setting the following optional parameters, you can define
additional contour elements:
 A:Oblique cut at contour start
 W:Oblique cut at contour end
 R:Rounding arc (in both corners of contour valley)
 B1:Chamfer/Rounding at contour start
 B2:Chamfer/Rounding at contour end
Cycle run
1 Approach workpiece from starting point
2 Finish first side, taking optional contour elements into account;
then finish contour valley up to position just before end point X2/
Z2
3 Approach workpiece for finishing the second side on paraxial path
4 Finish second side, taking optional contour elements into account;
then finish remainder of contour valley
5 Finish chamfer/rounding at contour start / contour end, if defined
6 Move to the tool change point according to the G14 setting
B1, B2 Chamfer/rounding arc (B1 contour start; B2 contour end)
 B>0: Radius of rounding
 B<0: Width of chamfer
RI, RK Workpiece blank oversizes in X and Z: Oversize before the
finishing operation for calculating the paths for approach/
departure and the finishing area
G47 Safety clearance (siehe Seite 140)
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.
MFE M at end: M function that is executed at the end of the
machining step.
WP Displays which workpiece spindle is used to process the
cycle (machine-dependent)
 Main drive
 Opposing spindle for rear-face machining