1) fast forward and into

G00 and G01 in processing applications can define the linear motion of the cutting tools, but they are different, the effect of easy to confuse the novice.

Work into the class instruction (G01, G02, G03) feed speed is determined by the F in the program instruction; Fast into the class instruction (G00 part and back to zero) procedures specified in the feed speed is not processing, but as the machine tool parameters when the machine parameter Settings in the numerical control system.

Work into class instruction not only to guarantee the accuracy of the machining the end, to guarantee the accuracy of the machining path and feed speed, this will depend on the microscopic interpolation calculation and dynamic control.

Fast forward as far as possible to reduce spare travel time is the purpose of class instruction, in multi-axis linkage, unpredictable. So quickly into the class instruction can not be used for processing and feed.

2) positioning accuracy and repeat precision

Machining center manufacturers in the publicity materials tend to give only repeat positioning accuracy and not positioning precision index is given, making it easier for the part of the user to repositioning precision will be misinterpreted as the main indexes of the precision parts processing. Actually does not mean that the parts processing precision high repeat positioning accuracy is high. Positioning accuracy is the major indexes of the precision parts processing.

Repeat positioning accuracy reflect the machine tool's ability to return to the same position for many times. Measurement method is fixed a dial indicator, header pressure on the main shaft, calibration dial indicator to zero. The removal of the spindle to any position makes it back to just coordinates of calibration, read the dial indicator reading error. After reading many times, the maximum error is repeated positioning accuracy.

According to the present typical electromechanical collocation, numerical control technology and machining center, rotary encoder and the servo motor ball screw and gear rack and repeat positioning error is generally not greater than 2 pulse equivalent, far less than 0.01 mm.

Positioning accuracy refers to the full machine stroke on the specified distance of the ability to move accurately. Aluminum processing center biggest can travel seven meters, precision measurement commonly used laser interferometer.

Positioning accuracy is mainly by rail form, error, mechanical clearance, screw/rack, deformation of the parts and electrical follow error influence. The error of the measured by laser interferometer data input digital control system, through error compensation function of CNC system can get high positioning accuracy.