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

9.SPINDLE SPEED FUNCTION (S FUNCTION) PROGRAMMING B-63324EN/03
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9.3 SPINDLE POSITIONING FUNCTION
Turning is described as follows: The spindle connected to the spindle
motor is rotated at a certain speed. As a result, the workpiece fixed to
the spindle is rotated, and turning is performed. The spindle positioning
function is described as follows: The spindle connected to the spindle
motor is rotated up to a certain angle to position the workpiece fixed to
the spindle at a certain angle. The use of this function enables a
workpiece to be drilled at any position.
The operations performed by the spindle positioning function are
classified as follows:
1. Operation from canceling spindle rotation mode to changing to
spindle positioning mode
2. Positioning the spindle in spindle positioning mode
3. Operation from canceling spindle positioning mode to changing to
spindle rotation mode
- spindle control system
The following figure shows the spindle control system.
When the spindle is rotated for turning (referred to hereinafter as
spindle rotation mode), the value corresponding to the spindle speed is
input from the spindle control unit to the D/A converter. When the
spindle is positioned (referred to hereinafter as spindle positioning
mode), the specified travel distance is input to an error counter and
converted into the velocity command for the spindle motor via the D/A
converter. The position of the spindle is then detected by the position
coder installed in the spindle.

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