Unidirectional System Assignment Help

Assignment Help: >> Termination and Origin Indication - Unidirectional System

Unidirectional System:

(a) Dimensional values shall be indicated hence such they may be read from the bottom of the drawing-sheet. Non-horizontal dimension lines are preferably near the middle, interrupted, hence the value may be inserted.

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(b) Angular dimensional values may be oriented also like in diagram.

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(c) The positioning of dimensional values frequently requires adapting to different conditions. Hence, for example where values may be:

(i) Close to a termination to ignore having to follow a long dimension line whereas only part of the dimension line requires to be displayed.

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(ii) Above the extension about the dimension line beyond one of the terminations, and space is limited as shown in diagram.

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(iii) on the ending of a dimension line that is too short for dimensional value to be indicated in the common way

(iv) On top of a horizontal extension of a leader line such terminates on a dimension line whereas space does not permit a placement at the interruption of a non-horizontal dimension line.

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(v) The given indications are used along with dimensions to display applicable shape identification and to develop drawing interpretation. The applicable indication or symbol shall precede for dimension the value.

f              :               Diameter

Sf            :               Spherical diameter

SR           :               Spherical Radius

R             :               Radius n               :               Square

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