1. Establishment of polar coordinate system
In mathematics, the polar coordinate system is composed of poles, polar axes and polar angles. However, the concept of the polar coordinate system on the NC turning and milling machining center is completely different from the polar coordinate system in mathematics. The polar coordinate system on the turning and milling machining center is composed of mutually perpendicular real axis (first axis) x and virtual axis (second axis) C in a plane perpendicular to the Z axis of the machine tool. The coordinate origin of the polar coordinate system coincides with the program origin, And the unit of virtual axis C is not degrees or radians, but the same as that of real axis X, both of which are millimeters.
2. Use of polar coordinate system instructions
(1) G112: enter polar coordinate interpolation mode.
(2) G113: cancel polar coordinate interpolation mode.
3. Several precautions when using polar coordinate system function programming on CNC turning and milling machining center:
(1) The G112 (enter polar interpolation mode) command and G113 (cancel polar interpolation mode) command must be placed in a separate statement;
(2) The coordinates of the real axis X in the program use the diameter value, and the coordinates of the virtual axis C use the radius value;
(3) When the machine tool is in the state of tool left compensation (G41) and tool right compensation (G42), the G112 command cannot be executed. To enter the polar coordinate interpolation mode, the machine tool must be in the state of tool compensation cancellation (G40);
(4) In G112 state, the unit of tool feed speed is mm/min;
(5) In G112 state, the radius value of the milling cutter used should be input into the machine tool as the geometric compensation of the cutter;
(6) Before the program is converted from polar coordinate system to rectangular coordinate system, the G113 command must be executed first.
Post time: Jul-02-2022