Symmetry measurement and evaluation in geometrical tolerances is a common problem encountered in the machine tool industry, such as shaft keyway and hole keyways and some special tooling, symmetry measurement and evaluation on gauges. The common shape of the part with symmetry requirements is shown in Figure 1. The measurement and evaluation of symmetry seems to be relatively simple, but it is not. First of all, the example of the evaluation method for the keyway specified in the original geometric tolerance standard GB1958-80 is not comprehensive enough. The correct evaluation method of symmetry has experienced a continuous improvement after the standard is promulgated.
A floor lamp is a tall lamp that stands on the floor and provides lighting to a room. It typically consists of a base, a long pole or stand, and a lampshade or light fixture at the top. Floor lamps can be used for general lighting or as a decorative accent in a room. They come in various styles, sizes, and designs to suit different interior décors and lighting needs. Some floor lamps also have adjustable features, such as adjustable height or angle, to provide flexibility in directing the light.
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