The origin refers to the origin of the machine tool coordinate system, which is a fixed point of the machine body. The machine origin of the machining center is set within the motion limit positions of the X, Y, and Z axes in the positive direction. It is a necessary operation to return the origin to zero before each product processing. This operation seems simple but has a very important impact on the processing accuracy.
We often use a vernier caliper to measure the length of a workpiece. The caliper will be reset to zero every time we use the caliper. The purpose of this is to allow the caliper to have a fixed reference object to ensure the accuracy of the measurement results. The same is true for the machining center. A fixed and precise switch is set on each axis of the machining center. When this switch is triggered, the machining center spindle will return to that specific position. Actions can be based on this point as a reference, which is the basic principle of returning to the origin. Even if there is a power failure during processing, the specific point can be found by performing the operation of returning to the origin again to ensure the consistency of the position of the reference point, thereby accurately connecting the previous processing path.
Machining center 850 returns to the origin operation, we often use G code to complete it. In the general G code, G53 and G28 are commonly used zero-return programming operations, and both can be used in the incremental value mode at the same time. But the difference between G53 and G28 is:
G53 is to directly return to the reference origin;
For G28, it is necessary to return to the origin of the current coordinate system first, and then return to the reference origin.
In terms of safety and efficiency, it is recommended to use G53 to return to the reference point. The specific programming of G53 will not be repeated here. The reason for selecting the G53 code is that before the origin switch is replaced, a workpiece is being processed on the worktable of the machining center, and the workpiece coordinate G55 is used. After the origin switch is replaced, if you want to continue processing this workpiece, you need to reset the G55 coordinates. This is because the previous G55 refers to the original origin coordinates, and now this origin has been offset, and all movements since then will also refer to this new origin coordinates, so the coordinates of G55 must be reset. Continue to execute the processing program.
Machining center is a new type of processing equipment. Although many processing procedures are simple, they cannot be ignored. The best choice of processing procedures can guarantee the high precision and efficiency of the processing center to a greater extent.
