[China Aluminum Industry Network] 1) Fast Forward and Progress

In the machining program, both G00 and G01 can define the linear motion of the tool, but their role is very different. Beginners are easy to confuse.

The feedrate of the work feed command (G01, G02, G03, etc.) is determined by the F command in the program; the feedrate of the fast feed command (G00 and part of the zero return command) is not specified in the machining program, but is set during the machine parameter setting. Saved as a machine parameter in the CNC system.

The work order instructions must not only ensure that the machining end point is accurate, but also ensure that the machining path and the feed speed are accurate, which depends on the microscopic interpolation calculation and dynamic control.

The purpose of fast-forwarding instructions is to minimize idle travel time. In multi-axis linkage, the motion trajectory is unpredictable. Therefore, fast-forwarding instructions cannot be used for machining feeds.

2) Positioning accuracy and repeatability

The processing center manufacturers often only give repeat positioning accuracy in the publicity material without giving the positioning accuracy index, making it easy for some users to misunderstand the repeat positioning accuracy as the main index for determining the part machining accuracy. In fact, high repeat positioning accuracy does not mean that the part machining accuracy is high. Positioning accuracy is the main indicator that determines the accuracy of part machining.

Repeated positioning accuracy reflects the ability of the machine to return to the same position multiple times. The measurement method is to fix a dial indicator, the head is pressed on the spindle, and the zero point of the dial indicator is calibrated. Move the spindle to any position and then return it to the calibration coordinate position just before reading the reading of the dial indicator. After many round-trip readings, the larger error is repeated positioning accuracy.

In accordance with the current level of CNC technology and machining center typical electromechanical collocation, namely servo motor + rotary encoder + ball screw or rack and pinion repeat positioning error is generally not more than 2 pulse equivalent, far less than 0.01mm.

Positioning accuracy refers to the ability to accurately move a specified distance over the full stroke of the machine. The large stroke of the aluminum processing center can reach up to 7 meters, and laser interferometer is generally used for positioning accuracy measurement.

The positioning accuracy is mainly affected by the shape error of the guide rail, mechanical clearance, screw/rack error, machine deformation and electrical following error. The error data measured by the laser interferometer is input into the CNC system, and the positioning accuracy can be obtained with the error compensation function of the CNC system.

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