CNC Knowledge

How do usually find the center coordinates of a CNC machining center circle?


How to find coordinates during CNC machining is one of the problems faced by many newcomers who have just contact with CNC machining centers. Today, we will introduce how to find the center coordinates of a circle on a machining center.


1.How to Find the Center Coordinate of a Circle in a CNC Machining Center

1)Place the dial indicator on the spindle. First, move it roughly to the center of the circle and manually rotate the spindle to check the gauge. Then, manually rotate it around the center of the circle to check the negative direction of the multiple head wheels pressed on the xy side. Then, manually rotate the spindle once and slowly adjust it. It is best to know that all three points are in the same position. When boring holes, all points on the gauge must be in the same position! As I become more proficient in this, it will become faster.


2)Install a drill bit, and the tip of the tool is roughly aligned with the center of the circle. Lift the Z-axis, disassemble the knife, the watch seat is sucked on the main shaft (the position where the knife is installed), and the dial indicator is against the surface of the workpiece. Then you manually rotate the main shaft and observe the dial indicator. Which direction has more pressure gauges? Move the hand wheel to the negative direction, and then correct it slowly.


3) Now the coaxial deviation correction device, as long as the instrument is clamped on the main shaft, the main shaft rotates twice, and the main shaft moves once, the XY coordinates between the main shaft axis and the workpiece axis can be displayed on the display screen. According to the deviation size, it is enough to shake the main shaft according to the size. It is very convenient and can be done in two or three minutes. The precision is high and no technology is required.


2.Understand the coordinates of the machining center

In order to describe the motion of the machine tool during NC programming, simplify the method of programming and ensure the interchangeability of recorded data, the coordinate system and direction of motion of the NC machine tool have been standardized, and both ISO and my country have drawn up naming standards. The Machine Coordinate System (Machine Coordinate System) is a Cartesian coordinate system composed of X, Y, and Z axes established with the origin of the machine tool O as the origin of the coordinate system and following the right-hand Cartesian Cartesian coordinate system. The machine tool coordinate system is the basic coordinate system used to determine the workpiece coordinate system. It is an inherent coordinate system on the machine tool and has a fixed coordinate origin.