1. G Function Description
1.2.17 G33: THREAD INTERPOLATION
Command form:
G33 Z F ;
Z: Absolute command (G90), coordinates of Z axis for end point;
Incremental command (G91), for length of thread in axis direction;
F: the thread of a screw (0.01mm);
Description:
When spindle turned, tool feeds in Z axis direction at the same time.
After repeating many times, there is inertia lag of the spindle rotation at
thread interpolation finishing. They will produce somewhat incorrect leads
at start and end points of a thread cut. In order to compensate this, thread
cutting length should be specified longer than required, in thread
interpolation, limit of spindle speed(R) is:
1 spindle speedRMax feedrate
thread lead
R: spindle speed(rpm)
Thread lead(F): mm or inch
Feedrate: mm/min or inch/min
Notes:
Max feedrate can be setting by parameter #405.
Acceleration and deceleration time of thread interpolation can be
setting by parameter #409.
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