The application of linear scale in the numerical control machine tool

linear scale as straight axis nc machine tool can detect the position of elements, the equivalent of "eyes", is to "monitor" the straight axis CNC system in the implementation of the mobile instruction, the straight axis is not really accurate operation to the CNC system The location of the instruction required. If the nc machine tools is not installed grating ruler, and makes a straight axis numerical control system of mobile command, the straight axis can reach the location of the numerical control system requirements, fully rely on the precision of numerical control system debugging and machine precision machinery transmission to protect. Numerical control machine tool use after a period of time, due to the electrical debugging parameter modification and partly due to the increase of mechanical error, the straight axis is likely to be the location of the instruction required and nc system differs a lot, don't know at this time nc system, maintenance and operation of machine tool personnel also don't know, if you want to know the difference, maintenance personnel will be tested for accuracy of nc machine tools. So nc machine tools is not installed grating ruler, shall regularly check on the accuracy of machine tools, carelessly, once forget to test the accuracy of CNC machine tools, is likely to lead to processing the product accuracy out-of-tolerance even scrapped.

If the straight axis nc machine tool installed linear scale, need not to worry about the problem, and by the grating ruler to complete the mission. If the straight axis due to reasons such as mechanical haven't reached the accurate location, grating feet as position detecting element, can issue instructions to the numerical control system, make the straight axis can reach more accurate location, until the resolution of the linear scale distinguish don't come out. At this time of the grating ruler served for the supervision function of the independent of machine tools, like people's eyes, always "monitor" a straight axis position, ensure the straight axis can meet the requirements of CNC system.

The precision of the linear scale depends on its resolution, quality is different, the price is different. Grating ruler is glass grating feet and steel grating ruler. The world can make glass linear scale length is about 3 meters long, more than three meters of the linear scale will choose steel tape.

In making new machine or used machine tools transformation, the purpose of using linear scale is to increase the running accuracy of straight axis. But can increase the grating ruler is not totally depends on whether to buy grating ruler, mainly depends on the geometry precision of mechanical part of the straight axis. linear scale can replace the mechanical precision, it can only be "the icing on the cake". Many people are there exist deviations in understanding on this issue. If straight axis geometric accuracy of machine tool is very poor, such as some lathe Z axis with straight rack drive, reverse gap is very big, even if the shaft after using linear scale, arrive when the axis CNC system operating instructions near location, due to the straight axis transmission accuracy is not high, not only the objective of any, instead of volatility in the exact location.

Nc machine tool which the root of the straight axis installation linear scale depends on the actual situation. General X axis nc machine tools must be installed grating feet, with a taper surface nc grinding machine grinding products, the general in order to guarantee the processing precision and surface quality of the cone, the Z axis is installed grating ruler. The Z axis of boring and milling machine general installation linear scale, other shaft depending on the precision of the processed products.

In numerical control machine tool, the linear scale is used as the numerical control system can detect the position of components, check whether the straight axis of the actual displacement of the machine tool and numerical control system of instruction.