
B-63344EN/02 SUPPLEMENT 6.RETHREADING
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6.1 OVERVIEW
Applicable threads
- Following thread types
General, metric, unified, piping PT, and PF
- Straight and tapered threads
- Single and multiple threads
- Normal (right-hand) thread and reverse (left-hand) thread
Spindle orientation
Perform spindle orientation before teaching the thread position.
Input data
Input data required for rethreading in the process data window
for ordinary threading. Specify "REPAIR" as the "METHOD"
input item to perform rethreading.
Rethreading requires the following data items like ordinary
threading:
Process data: TYPE, METHOD, ANGLE, and LEAD
Figure data: START X, START Z, END X, and END Z
For details of each item, see the corresponding chapter in this
operator's manual.
Teaching the thread position
Teach the thread position to synchronize the tool feed with the
mounted thread. Touch the tool on the bottom of an appropriate
thread and press soft-key [SYNC P] to teach the thread position.
The taught position is used to provide timing to start feeding the
tool at the cutting start point.
Tool motions
The tool moves for rethreading as shown in the figure below:
a) Moves from the current tool position to the approaching point.
b) Moves from the approaching point to the cutting start point.
c) Performs threading.
For details of each point, see the corresponding chapter of this
operator's manual.
Current tool
Approaching point
Cuttin
start point
Thread
Synchronization
To synchronize the tool feed with the mounted thread, the tool is
made wait for the start of tool feed at point A shown in the figure
below by the number of spindle rotations that is obtained by the
following equation:
Q = Qs + Qz - Qe - Qp (degree)