tailieunhanh - Mechanical Tolerance Stackup and Analysis Part 8

Tham khảo tài liệu 'mechanical tolerance stackup and analysis part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 198 Chapter 9 first tolerance Stackup and separate requirements is the default condition in the second tolerance Stackup. Tolerance Stacklip with Simultaneous Requirements In this example the switch carrier shown in Fig. is mounted onto the back panel shown in Fig. which has simultaneous requirements as the default condition. The assembly is shown in Fig. . The object of this tolerance Stackup is to determine if the switch carrier protrudes beyond the cutout in the edge of the back panel. The simultaneous requirements Tolerance Stackup Report is shown in Fig. . Simultaneous requirements only affects the back panel as there are two tolerances in the tolerance Stackup that are toleranced relative to datum reference frame A B at MMC on the back panel. Note For simplicity 4 mm was used as the size of the M4 threads in the assembly shift calculations in both tolerance Stackups. Datum feature shift shows up in the Tolerance Stackup Report in Fig. three times once for the switch carrier and twice for the back panel. Gap A-B - Profile Edge DF Shift Back Panel Profile Edge @ DF Shift Switch Carrier Position DF B Holes BonusTolerance @DF Shift Direction of study 7 Assembly Shift Switch Carrier Position DF B Holes Bonus Tolerance DF Shift Switch Carrier Back Panel Switch Carrier Back Panel Chain of Dimensions and Tolerances Figure Simultaneous requirements-Tolerance Stackup sketch for Figs. and . Geometric Dimensioning and Tolerancing 199 Simultaneous requirements do not affect the switch carrier s contribution to the tolerance Stackup because only one of the switch carrier s tolerances in the tolerance Stackup is related to a datum reference frame that may have datum feature shift. Simultaneous requirements do affect the back panel s contribution to the tolerance Stackup because two of the back panel s tolerances in the tolerance Stackup are related to the same datum reference frame which may have datum feature shift A B at MMC . The .

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