
B–63522EN/02
4. THREAD CUTTING
NC FUNCTION
71
By feeding the tool synchronizing with the spindle rotation, thread
cutting of the specified lead is performed. In addition to straight threads,
taper threads and scroll threads can be cut with equal leads.
L
Straight thread
Taper thread
Scroll thread
L
L
F_ : Lead along the long axis
(axis having the largest amount of travel)
G33 _ F_ :
IP
To form a single thread, threading is generally performed several times
from rough machining to finish machining along the same path.
Threading starts when the one-revolution signal from the position coder
attached to the spindle is detected. So threading always starts at the same
point on the circumference of the workpiece, and threading is performed
along the same path on the workpiece. In this case, however, the shaft
must rotate at a constant speed during operations from rough machining
to finish machining. If the spindle speed changes, an accurate thread may
not be produced.
The following shows the specifiable lead range:
Specifiable lead range
Metric input F1 to F50000 (0.01 to 500.00mm)
Inch input F1 to F99999 (0.0001 to 9.9999inch)
Specifiable lead range
Metric input 0.0001 to 500.0000mm
Inch input 0.000001 to 9.999999inch
NOTE
Leads exceeding the maximum cutting feed speed when
converted to per minute feed speed cannot be specified.
4.1
EQUAL LEAD
THREAD CUTTING
(G33) (WITH G CODE
SYSTEM A: G32)
Format
Explanations
D M series
D T series