B-63322EN/03 NC FUNCTIONS 4.THREAD CUTTING
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When a tapered thread is produced, the lead must be specified with the
magnitude of a larger component. A lathe which holds and rotates a
workpiece can produce a tapered thread on the workpiece.
Fig.4.1 (b) Lead Position
In general, the lag of the servo system, etc. will produce somewhat
incorrect leads at the starting and ending points of a thread cut. To
compensate for this, a thread cutting length somewhat longer than
required should be specified.
Table 4.1 (a) lists the ranges for specifying the thread lead.
Table4.1 (a) Ranges of lead sizes that can be specified
Least command
increment
Command value range of the lead
0.01 mm 0.001 to 5000.0000 mm/rev
0.001 mm 0.00001 to 500.00000 mm/rev
0.0001 mm 0.000001 to 50.000000 mm/rev
0.00001 mm 0.0000001 to 5.0000000 mm/rev
mm input
0.000001 mm 0.00000001 to 0.50000000 mm/rev
0.001 inch 0.00001 to 500.00000 inch/rev
0.0001 inch 0.000001 to 50.00000 inch/rev
0,00001 inch 0.0000001 to 5.0000000 inch/rev
Inch input
0.000001 inch 0.00000001 to 0.50000000 inch/rev
X
Z
LX
LZ
Lead of tapered thread
When angleαis less than or equal to 45°, specify LZ.
When angleα
is greater than or equal to 45
°, specify LX.
α