HEIDENHAIN CNC PILOT 640 User Manual page 348

4
H: Type of offset for smoothing the thread flanks (default: 0)
0: Without offset
1: From left
2: From right
3: Alternating left/right
R: Remaining cut depth (V=4)
C: Start angle
BD: Outside=0 / Inside=1 – external/internal thread (no meaning
for closed contours)
0: External thread
1: Internal thread
F: Thread pitch
U: Thread depth
K: Thread runout length
K > 0 Run-out
K < 0 Run-in
D: No.gears
Q: Number no-load.
E: Variable gr. (default: 0)
Increases/decreases the pitch per revolution by E.
If a thread has been defined with G24, G34 or G37-Geo,
the parameters F, U, K and D are not relevant.
Slop.length B The slide requires a run-in distance at the start of
thread in order to accelerate to the programmed contouring feed
rate before starting the actual thread.
Overflow length P: The slide needs an overtravel at the end of
the thread to decelerate again. Remember that the paraxial line P
needs overtravel even with an oblique thread run-out.
You can calculate the Slop.length and Overflow length with the
following equation:
Slop.length: B = 0.75 * (F * S)² / a * 0.66 + 0.15
Overflow length: P = 0.75 * (F * S)² / a * 0.66 + 0.15
F: Thread pitch in mm/revolution
S: Spindle speed in revolutions/second
a: Acceleration in mm/s² (see axis data)
348
DIN/ISO programming | Thread cycles
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017