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TECHNICAL REFERENCE

TECHNICAL REFERENCE
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DEFINITIONS AND DESIGNATIONS OF GEOMETRICAL DEVIATIONS (JIS B0621) TOLERANCING OF FORM, ORIENTATION, LOCATION AND RUN-OUT (JIS B0021) STRAIGHTNESS Straightness indicates the degree of deviation of a straight portion from the geometrical straight line. Straightness of two directions perpendicular to each other (Axis of a rectangular parallelepiped) Straightness with no direction defined Straightness of a surface element Space inside the prism enclosed by two pairs of parallel planes with intervals of 0.2mm and 0.1mm in the directions of indicated arrows Space inside a cylinder with a...

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Perpendicularity assumes a combination of two straight portions, a straight portion and a flat portion, or two flat portions which must be perpendicular to each other. Perpendicularity indicates, with one of the two portions as a reference, the degree of deviation of the other straight or flat portion from the geometrical straight line or Perpendicularity of a flat portion with respect to the reference straight line (with the axis of a cylinder as a reference) reference plane lat portion with respect to the Space between two parallel planes with an interval of 0.08mm, perpendicular to the...

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