V - The magazine of the VOLLMER Group - 2018

1 3 2 4 1  MANUAL MEASURING The workpiece is clamped by hand, recorded by the camera and transferred to the screen. 2  MEASURING WITH A MEASURING MACHINE requires greater investment and takes longer, but delivers precise results and measurement reports. 3  SETPOINT-ACTUAL CONTOUR COMPARISON OF A FIR TREE CUTTER The exact values of the deviation are displayed in a table. 4  SETPOINT-ACTUAL COMPARISON OF A RADIUS CUTTER with a perfect sphere (outer deviation: 0.002 mm; inner deviation: 0.003 mm). MEASURING METHODS Whether it is milling, drilling or cutting – how precise the result is depends consider- ably on the geometry of the tool. This can be controlled and measured in two ways: manually and using a measuring machine. Whereas the former is popular, measur- ing machines are not profitable for every application. All dimensions taken manually can also be recorded using a measuring machine: but the same does not apply the other way round. MANUAL MEASUREMENT Manual measurement is simple, fast and intuitive. No complex programming or training is required. However, the results are often not as accurate as with a CNC measuring machine and vary from one employee to another. Therefore, measure- ment reports can often not be created or used, meaning the method alone is not adequate for series production. Diameters are measured using laser technology (precision ±0.001 mm). For this, one holds the blanks or tools in the laser beam; in the case of several cutting edges the workpiece must be turned. In contrast, geometries (angles, lengths, widths, distances and radii) can be detect- ed with a camera and checked on the screen (Fig. 1); dimensions are read off using measuring blocks. The surface quality can also be examined. MEASURING WITH A MEASURING MACHINE Measuring with a measuring machine (Fig. 2) always provides reproducible measure- ment results and is employee-independent. Programmes and measurement reports can be retrieved at any time. In addition, various automation solutions can be con- nected (Industry 4.0). Both diameters and geometries are measured with maximum precision (±0.002 mm). However, the method is generally associated with complex programming and re- quires specialist staff. In contrast to the manual method, profiles and contours are also recorded and an exact setpoint-actual comparison is carried out. Either using an existing setpoint contour like with the fir tree cutter (Fig. 3) or using a perfect sphere like with the radius cutter (Fig. 4). 27 26 FEED