Cutter Compensation in Thread Milling
To provide cutter compensation output in Thread milling, set the CUTCOM parameter to ON and specify a value for CUTCOM_REGISTER. The system will determine the cutcom direction (LEFT or RIGHT) based on the material side. Specify it using the
Internal or
External option on the
Thread Milling tab, and the direction of the tool movement.
A linear motion in the XY plane is required to turn cutter compensation ON or OFF. If there is no linear to turn it OFF, cutter compensation is not turned ON.
• When APPROACH_TYPE or EXIT_TYPE is set to HELICAL or NONE, use the NORMAL_LEAD_STEP and TANGENT_LEAD_STEP parameters to specify the length of this linear motion. The linear motion will be created at the Z level of the initial (for approach) or final (for exit) point of the thread motion. The segment defined by TANGENT_LEAD_STEP will be tangent to projection of tool path at this point. If TANGENT_LEAD_STEP is not defined, the segment defined by NORMAL_LEAD_STEP will be normal to projection of tool path at this initial/final point; otherwise it will be normal to the tangent linear segment and attached to its end. Cutcom is invoked on the first linear move, and turned off on the last linear move.
• When APPROACH_TYPE or EXIT_TYPE is set to RADIAL, the CUTCOM statement will be placed on the radial approach or exit motion. The distance is determined by the APPROACH_DIST/EXIT_DIST value.