B500
B500 Page 10 840D/828D SINUMERIK Operate
Notes
Boring Section 4
Unit
α
Lifting angle (tool orientation angle) (only for lift-
ing the tool), spindle position for orientated spin-
dle stop in the cycle.
Degrees
α0
Rotation angle for the straight line, referred to
the X-axis
Degrees
α1
(Pitch circle)
Advancing angle (only for circular pattern pitch
circle)
Degrees
Lifting
mode
No lifting
The cutting edge is not retracted, but re-
turns to the safety gap height with rapid
traverse.
Lifting
The cutting edge is moved clear of the
edge of the bore and is then lifted to the
retraction level.
Degrees
αS
Starting angle offset (only for tapping without a
compensating chuck)
Degrees
αX
Shearing angle X (only for the location patterns
grid or frame)
Degrees
αY
Shearing angle Y (only for the location patterns
grid or frame)
Degrees
Centre drill-
ing
Centering at reduced feedrate
Yes
No
The reduced feedrate is arrived at as fol-
lows:
Drilling feedrate F1 < 0,15mm/rev:
Centre drilling feedrate = 30% of F1
Path feedrate F1=> 0,15mm/rev:
Centre drilling feedrate = 0,1 mm/rev
Selection
Selection of tabular value:
M1 - M68 (ISO metric)
W3/4"; etc. (Whitworth BSW)
G3/4"; etc. (Whitworth BSP)
1" - 8 UNC; etc. (UNC)
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