What's the use of G64 in CNC machining center? What does it mean in this system? By the way, does FANUC have G64?

Stop exactly? (G09, G6 1), cutting method? (G64), attack? (G63)

In the precise stop mode, cutting mode and tapping mode, the paths between program blocks are different (Figure 5.4. 1(a)).

Mitsubishi system and FANUC

Haas system is similar:

G6 1: precise stop mode (group 13)

The G6 1 code is used to specify the exact stop position. It is modal, so it will affect the following blocks. After each instruction is executed, the machine tool

The shaft will stop exactly.

G64:G6 1？ Cancel (13 group)

The G64 code is used to cancel the precise stop (G6 1).

Extended data:

According to the control mode of servo system, numerical control system can be divided into the following categories:

(1) open-loop control numerical control system

This numerical control system has no detection device and feedback circuit, and uses stepping motor as driving element. The feed instruction (mostly pulse interface) output by CNC device is amplified by driving circuit.

It is converted into a current pulse signal to control the corresponding on/off of each stator winding of the stepping motor, which drives the stepping motor to rotate, and then drives the workbench to move through the transmission mechanism (gearbox, screw, etc.) of the machine tool. ). This method is simple to control and relatively cheap. Since 1970s, it has been widely used in economical CNC machine tools.

⑵ Semi-closed loop control numerical control system

The position detection element is installed at the shaft end of the motor or the shaft end of the lead screw, and the actual working position (linear displacement) of the machine tool workbench is indirectly calculated by measuring the angular displacement.

Because the closed loop does not include large inertia links such as lead screw, nut pair and machine tool table, the errors caused by these links cannot be corrected by the loop, and its control accuracy is not as good as that of the full closed loop control numerical control system, but it is convenient to debug, moderate in cost and can obtain relatively stable control characteristics, so this method is widely used in practical applications.

⑶ Full closed-loop control numerical control system

The position detection device is installed on the machine tool workbench, which detects the actual operating position (linear displacement) of the machine tool workbench, compares it with the command position (or displacement) calculated by the numerical control device, and uses the difference to adjust and control.

This control method has high position control accuracy, but the connection stiffness of the whole system becomes worse because the connecting links such as the lead screw, the nut pair and the machine tool workbench are placed in the closed loop, so it is difficult for the system to achieve high gain during debugging, that is, it is easy to produce oscillation.

Baidu encyclopedia-numerical control system