Figure 6.17 Examples of tick symbol designations profile. The upper limit is a Ra value of 3, lum using the 'max-rule'. The lower limit is a Ra value of 0,9um and the '16% rule' applies as the default. With both the upper and lower limits, the default transmission bands apply and the Ra value is to be examined over the EL of five SL's. The lay is unspecified so therefore any lay pattern is acceptable.
The interpretation of the tick symbol shown in Figure 6.17b is as follows. The upper specification limit is a Ra value of 5,5um and the lower specification limit is a Ra value of 6,2um. The '16% rule' applies to both as the default. In both cases the lower transmission band is 0,008mm and the upper is 4mm. No SL is specified with respect to the parameter so the default situation of the EL applies. Thus, all of the five SL Ra values must be tested. The manufacturing processes is to be milling such that the surface layer is approximately circular around the centre. In this case the 'U' and 'L' is not stated because they are obvious.
The interpretation of the tick symbol as shown in Figure 6.17c is as follows. The surface is to be produced by grinding with the lay approximately perpendicular to the projection plane. There are two upper specification limits set by a Ra value and a Rz value. The Ra value is limited to l,5um using the default '16% rule'. The upper and lower transmission bands are the default values. All five SL's are to be considered. The Rz value is to be limited to 6,7um and the 'max-rule' applies. The upper transmission band is 2,5mm and the lower transmission band is the default value. All five Rz values in an EL must be considered.
The interpretation of the tick symbol in Figure 6.17d is as follows. The surface is to be produced by nickel-chromium plating and no material is to be removed afterwards. There is one upper limit for Ra and an upper and a lower limit for Rz. The upper limit for Ra is 3, lum and '16% rule' applies. The lower transmission band is the default value and the upper transmission band is 0,8mm. Each of the five SL's is to be examined for the Ra values. The upper limit is 18um when the lower transmission band is the default value and the upper transmission band is 2,5mm. The lower limit is Rz of 6,5um when the lower transmission band is the default value and the upper is 2,5mm. The '16% rule' applies to the both the upper and the lower Rz values. All five SL's are to be investigated with respect to the upper and lower Rz values.
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