1. The relative coordinates are used by the operator, such as finding the zero point of the compound knife. There is a certain connection between mechanical coordinates and absolute coordinates. Let me give you an example. For example, when a part is programmed, there must be a coordinate zero point, which is the absolute coordinates x0 and Y0. That is to say, absolute coordinates are used for programming, and finding this zero point is the programming zero point
precautions for each coordinate system of machining center: all coordinates are based on a fixed coordinate system, which describes the position of the origin of the coordinate system. The absolute coordinate is a fixed coordinate position, and the point coordinates input will not be different with different references
extended data:
NC Lathe Feed processing path refers to the path that the turning tool starts to move from the tool setting point (or the fixed origin of the machine tool) until it returns to the point and ends the processing program, including cutting path and non cutting empty path such as tool cut in and cut out
The feed route of finishing machining is basically carried out along the contour sequence of parts, so the key point of deter
mining the feed route is to determine the feed route of rough machining and empty stroke. In the CNC lathe processing, the determination of the processing route should generally follow the following principles
2. Unknown_Error
3. The workpiece coordinate system is the coordinate system established on the workpiece when the programmer writes the program. The position of the origin of the workpiece coordinate system is the zero point of the workpiece. In theory, the setting of workpiece zero point is arbitrary, but in fact, it is set by programmers according to the characteristics of parts for the convenience of programming and the intuitive size. When choosing the workpiece coordinate system, we should pay attention to: 1) the zero point of the workpiece should be selected on the dimension datum of the part, so as to facilitate the calculation of coordinate value and rece errors; 2) The zero point of the workpiece should be selected on the surface of the workpiece with high accuracy to improve the machining accuracy of the machined parts; 3) For symmetrical parts, the zero point of the workpiece is set on the symmetrical center; 4) For general parts, the zero point of the workpiece is set at a corner of the workpiece contour; 5) In z-axis direction, the zero point is usually set on the workpiece surface; 6) For the horizontal machining center, it is better to set the zero point of the workpiece at the appropriate position of the uniform z-axis line on the rotation center; That is to say, when programming on the worktable (7), the tool starting point and program starting point should be set at the same place, which can simplify the program and facilitate calculation. Please see for details http://www.busnc.com/prog/zhongxin/
4. Please clarify, is it machine coordinate system or workpiece coordinate system. In general, the workpiece coordinate system is set by g54 to G59, and the local coordinate system can also be set by G92 and G52. The machine coordinate system is set with dry g53
go to the recer forum website to check the answer details & gt& gt;
5. Absolute coordinates are relative to the workpiece origin coordinates, relative coordinates are relative to the previous point coordinates, mechanical coordinates are relative to the machine origin coordinates, the machine origin will not change, which is the relative coordinates is more difficult to understand, I hope you can understand. It's going to take time.
6. The workpiece of the milling machine moves in X and Y directions with the worktable, and the cutter moves up and down with the spindle box in Z direction.
generally speaking, first determine the z-axis direction, and if it is far away from the workpiece, it is the positive direction in Z direction. Therefore, upward is Z +, and then according to the right-hand rule (thumb up, four fingers gripping direction is x pointing to Y direction), the right side is x +, and inward is y +. All the judgment methods of machine tools are the same,
including the lathe, the tool rest of the lathe is far away from the workpiece, that is, the tool rest is to the right, this direction is Z +, because the lathe has only two directions, so the inward direction is x +.
7. The workpiece coordinate system is set by you according to the processing technology, which is completely defined by you. The workpiece coordinate system is established under the machine tool coordinate system, which is generally defined by the machine tool manufacturer according to the characteristics of the equipment. Some mechanical calibration points will be installed inside the machine tool to make it easy for users to calibrate.
8. Must be consistent, otherwise cannot use numerical control machine tool.
9. In machining center, the worktable moves and the spindle does not move. I understand what the landlord means. Does the landlord mean that according to the Cartesian right-hand rule, if the x-axis moves in a positive direction, the worktable should move to the right, and if the x-axis moves in a negative direction, the worktable should move to the left< But you should know that Cartesian right-hand rule is based on the principal axis in processing. In theory, if the x-axis moves in the positive direction, the principal axis should move to the right, and if the x-axis moves in the negative direction, the principal axis should move to the left. But in fact, the principal axis is fixed, so it can only be realized through the workbench. So it is reversed
10. FANUC system G52 local coordinate system
purpose:
setting a subroutine in the workpiece coordinate system can simplify the complexity of calculation and improve the efficiency of calculation?? The format of the program:
G52 X Y Z
G52 X0 Y0 Z0 → cancel
o1000
M6 T1
G90 G54 X0 Y0
G90 G52 X200. Y80. The original g54 program's origin position is shifted (X200. Y80.)
x0 Y0; Re specify the origin (local coordinates)
G90 G52 X0 Y0 Cancel the program origin offset
M30
