Determination of dimensions of tubes

摘要: Measurement of lengths for determining the outside diameter, wall thickness or inside diameter tubes which, must be maintained to close tolerances. A mandrel tungsten carbide having a coaxial projection knife-edge width is postioned so that its transverse dimension intersects beam and parallel plane beam. first length measured between end nearest point on projection. tube mounted with longitudinal axis inner surface engaging this. second from tube. The shadow produced by laser most remote equal less length. twice thickness. An advantage this invention measurement carried out only one instrument instead two as required prior art.