HEIDENHAIN TNC 360 User Manual - Manual (Page 160)

8-7 TNC 360
8 Cycles
Fig. 8.2: TAPPING cycle
8.2 Simple Fixed Cycles
1. 2. 3. 4.
B B
A
B
TAPPING with floating tap holder (cycle 2)
Process
• The thread is cut in one pass.
• When the tool reaches the total hole depth, the
direction of spindle rotation is reversed. After the
programmed dwell time the tool is retracted to
the starting position.
• At the starting position, the direction of rotation
is reversed once again.
Required tool
A floating tap holder is required for tapping. The
floating tap holder compensates the tolerances for
feed rate and spindle speed during the tapping
process.
Input data
• SETUP CLEARANCE
A
:
Distance between tool tip (starting position) and workpiece surface.
Standard value: 4x thread pitch.
• TOTAL HOLE DEPTH B (thread length):
Distance between workpiece surface and end of thread
• DWELL TIME:
Enter a value between 0 and 0.5 seconds to prevent wedging of the
tool when retracted. (Further information is available from the machine
manufacturer.)
• FEED RATE F:
Traversing speed of the tool during tapping.
The signs for setup clearance and total hole depth are the same and
depend on the working direction.
Calculations
The feed rate is calculated as follows:
F = S x p
F: Feed rate (mm/min)
S: Spindle speed (rpm)
p: Thread pitch (mm)
When a cycle is being run, the spindle speed override control is disabled. The feed rate override control is only active
within a limited range (preset by the machine tool builder).
For tapping right-hand threads activate the spindle with M3; for left-hand threads use M4.