Several Methods of Origin and Origin Regression of FANUC System
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Since it is to find the origin, first talk about what is the origin, the origin is divided into: the origin of the program, the origin of the operation, the origin of machinery these three terms, first talk about it.
The origin of the program: the reference point for the size of the drawings, there is nothing to explain, we all understand.
Operation Origin: By means of the origin correction operation, any one of the movable points can be set. When the machine moves, this point is used as the "0" point of the coordinate system. When the workpiece is machined, this point is used as a reference point for processing.
explain:
1, processing, the origin of the operation must be consistent with the origin of the program.
2. The so-called origin correction operation is an operation for finding the distance between the machine origin and the XYZ axis origin of the operation. The distance obtained by this item operation is called the “origin correction valueâ€.
Mechanical origin: OSP control, in order to know the current position of the tool, in the XYZ ball screw drive pump on each axis, each equipped with OSP type position detector, this OSP type position detector can be in the full stroke of the machine This produces a 7-digit value. The mechanical position that OSP can know is this value.
Now, let's talk about the origin return (back to the above origin? Of course it's back to the mechanical origin). First, let's talk about the most commonly used one.
Method One Operational Essentials:
1. The axis to be established is to be operated by hand wheel and moved to the vicinity of the machine origin;
2, then, the axis is moved to the center of the moving range by about 100mm (B axis is shifted by about 30 degrees in the negative direction;
3, At this time, please move to a position near the origin at a speed of 230mm or more per minute, and stop approximately 2mm from the origin (about 1 degree within B axis);
4, in the origin return screen automatically return by the origin can be.
Method two (applicable to special machine tools, only Z-axis motion), the origin of the machine is usually the origin position when the origin of the machine is lost, the tube is the first origin or the second origin, the error is very small ( My actual experience, ah, is not blind, so, ah, directly change the 4# of the parameter 1815 from 0 to 1; of course, to turn off the power once, and then process the material, a measurement is only 0.02 difference. ? No! If you don't want to say, move the Z axis in the direction you need to measure a difference, and then re-establish the origin by the above method.
Method 3 is my trick, and I haven’t missed it. (Oh, don’t laugh, it’s true).
Everyone knows when programming that when the spindle is machining a hole (assuming that both sides are required to be machined, and the degree of concentricity is required), the absolute value of the command on the XY axis does not change after the B axis rotates 180 degrees, but it still processes the same. A hole, and a good concentricity, which is why, originally, when setting the processing coordinate system, we have set it up, and the absolute value of the 0 and 180 degree coaxial values ​​added is equal to the machine axis. The total length of the trip.
Well, using this, I will use the X axis as an example to find a temporary origin for the X axis. When B is 0 degrees, the X axis will be moved to the set point of work and the Z axis will be used as the work fixture. On or bad material, processing a little (for measurement), and then rotate the B axis by 180 degrees, then move the X axis to the home point we set, and then work on the work fixture or bad material, if Before and after the two processing positions overlap, congratulations, you find the temporary origin is the true origin you find, but the reality is ruthless, the actual will not be such a coincidence, how to do, say, measure the difference between the two processing again Divide by 2 (do not understand it), that is, we need to adjust the value, and then X axis corresponding direction to move the difference distance, according to method two, re-establish the origin is OK, and the corresponding, the other axis is the same .
In summary, the first method is the best, the second method is suitable for a certain machine, and the third method is very useful, but the person who has not compiled the process is not easy to understand. We choose flexible applications. Disclaimer: The above method is absolutely applicable to the FANUC system.
Of course, if an exchange motor is encountered and the origin position of the machine is shifted, it is necessary to confirm the origin of the fixture, and after setting the error value in the 1850 parameter, it can be operated according to the above method.