Machines can use several different methods to locate the position of the machine work head in relation to zero position markers. An example is the Linear Scale. There are several manufactures of linear scales. These scales have different lengths depending on the overall travel distance needed by the axis travel of the machine. These scales are made up of a graduation glass, a reader head that senses the marks on the glass, and a signal amplifier. The accuracy of movement is dependent upon the degree of measure of each scale, i.e. one hundred marks per inch is more accurate than fifty marks per inch. The higher the count, the more accurately the movement is measured. Dust, oil and other foreign materials will likely cause a miscount because the reader head may count dust or contaminates as a mark on the glass. Good maintenance on the seals and regular cleaning of the scale will help extend the life of linear scale.
Comments
Post has no comments.