Thread Recutting; Outline - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function

14.3 Thread Recutting

14.3 Thread Recutting

14.3.1 Outline

The function stores a thread groove position and compensates a start position of spindle thread cutting automatically so that
the tool can pass along the memorized position of the thread groove at the thread cutting execution. Thread machined
workpieces which have problems such as the thread number shortage, striped groove, etc., can be re-chucked and thread re-
cut.
(1) Re-chucking of thread machined workpiece (2) Memorizing thread groove position (memorizing
(3) Moving to start position after tool retract
[Thread recutting correspondence table]
Thread cutting command
Thread cutting
Continuous thread
Variable lead thread
Fixed cycle for turning machining
Compound type fixed cycle for turning ma-
chining
○ : Machinable △ : Machinable with conditions × : Impossible
Machinable with conditions ( △ )
(*1) Continuous thread: Conduct a memorizing of thread recutting position at the groove on the first block of continuous
thread.
(*2) Variable lead thread: Thread recutting is disable during an automatic operation with thread recutting enabled when the
first thread cutting command is the variable lead thread cutting.
(*3) Compound type fixed cycle: Re-finishing can be performed to the finished workpiece. Thread recutting cannot be per-
formed correctly if a memorizing operation is conducted to the finished workpiece.
IB-1501668-B
lead axis and spindle position)
(4) Thread recutting ON and program operation
start
The start position of spindle thread cutting is auto-
matically compensated with the memorized position
of the lead axis and spindle.
Z direction feed thread
Right-handed/Left-handed thread
○
△ (*1)
△ (*2)
○
△ (*3)
580
X direction feed thread
Scroll thread
○
△ (*1)
△ (*2)
○
△ (*3)