At present, the rotational angle accuracy of common machine tools in China is mostly 1° or 0.5°, and in actual production, workpieces with higher angular accuracy are often encountered. Such as: X53K vertical lifting table milling machine vertical milling head, the original dial has a graduation value of 0.5 ° per grid (as shown in Figure 1), it is difficult to guarantee the workpiece with high angular accuracy. The author made a slight improvement in the milling machine in the actual work, and received a good use effect. The main methods are as follows:
figure 1
(1) Basic structure
Figure 2 shows the deployment of the dial using the principle of the cursor. The main ruler is the original dial on the milling machine turntable with a line spacing of 30' (0.5°), which remains the same; we are in the original zero position of the milling machine. To modify a pair of feet, take the length of 29 grids (ie 14.5°) on the main ruler into 30 grids, then the score of the minor ruler is 29/30×30′=29′.
figure 2
(2) Principle of engraving
The difference between the main ruler line index value and the score line division value of the sub-scale is 30'-29'=1', and the difference is the reading value of the index plate. When the sub-zero line is aligned with the main rule zero line, the first engraved line of the sub-foot is different from the first engraved line of the main ruler by 1', and the second difference is 2', and the 30th difference is 30' ( That is 0.5°). When the sub-scale rotates to the right 1', the first engraved line after the sub-zero line is aligned with a certain engraved line of the main ruler; when the sub-foot is rotated 2' to the right, the second after the sub-zero is The line is aligned with a certain line of the main ruler, and so on.
(3) Reading method
Step 1: Read the degree and half of the main ruler on the left side of the sub-zero line.
Step 2: Look at which score line on the sub-scale is aligned with a certain line of the main ruler and read the score part directly.
The third step: adding the degree, the half degree and the fractional part, the number of angles of the vertical milling head rotation is obtained.
Figure 3 shows the vertical milling head rotating 2°46'.
image 3
It has been proved by practice that this method is simple and fast, and the machining accuracy is greatly improved. This method can also be applied to similar mechanisms, such as small skateboard rotation of ordinary machine tools.
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