Fanuc Series 15i/150i-MA (Programming) Operators Manual

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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 4.19 (a) lists the ranges for specifying the thread lead.
Table4.19 (a) Ranges of lead sizes that can be specified
Least command
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
1 The spindle speed is limited as follows :
1 spindle speed (Maximum feedrate) /(Thread lead)
Spindle speed : min
Thread lead : mm or inch
Maximum feedrate : mm/min or inch/min ; maximum
command-specified feedrate for feed-per-minute
mode or maximum feedrate that is determined based
on mechanical restrictions including those related to
motors, whichever is smaller
2 Cutting feedrate override is not applied to the
converted feedrate in all machining process from
rough cutting to finish cutting. The feedrate is fixed at
3 The converted feedrate is limited by the upper
feedrate specified.
4 Feed hold is disabled during threading. Pressing the
feed hold key during thread cutting causes the
machine to stop at the end point of the next block
after threading (that is, after the G33 mode is

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