they are used by showing where it is
Engineering societies develop standards to maintain uniformity across the profession.
The answer of this qustion is in "Fundamentals of Design and Manufacturing book"
The Interstate Highway standards for the U.S. Interstate Highway System uses a 12-foot standard for lane width.
Crown platforms are not universally required on production rigs, as their necessity depends on the specific design and operational requirements of the rig. They are often used to provide additional workspace and enhance safety during drilling operations. Regulatory agencies and industry standards may dictate their use in certain situations, but ultimately it varies by rig type and the operational practices of the company.
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Dimensioning standards are official guidelines that define how measurements, notes, and symbols are presented on technical drawings to ensure clarity and accuracy. They establish rules for line types, arrowheads, text size, and placement of dimensions to avoid confusion during manufacturing or inspection. Following these standards ensures that the drawings are universally understood, reducing the risk of errors in production. Utilizing the best dimensioning systems allows engineers and designers to maintain uniformity, improve communication, and streamline the manufacturing process. By adhering to these standards, industries achieve precise, reliable, and efficient results in creating high-quality components and products.
In graphics, dimensions are typically drawn to standards defined by the American National Standards Institute (ANSI) or the International Organization for Standardization (ISO). These standards ensure consistency and clarity in technical drawings, including dimensioning practices. ANSI Y14.5 is particularly notable for dimensioning and tolerancing in engineering drawings.
Methods of dimensioning include linear dimensioning, which specifies the size and location of features using straight measurements; angular dimensioning, which indicates angles between lines or surfaces; and radial dimensioning, which is used for circular features, providing the radius or diameter. Additionally, leaders and notes can be employed to clarify specific details. These methods ensure clear communication of sizes and relationships in technical drawings.
a bubble tube of a level has a sensitivence of 20" per 2 mm division. Find the error in the reading on the staff held at a distance of 100 mm from the level when the bubble is deflected by two division from the centre.
Things like General Dimensioning and Auto Dimensioning
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Engineers adhere to dimensioning standards and guidelines to ensure clear communication and consistency in technical drawings and designs. These standards help prevent misunderstandings, reduce errors, and facilitate collaboration among diverse teams and stakeholders. By following established conventions, engineers can also ensure compatibility with manufacturing processes and quality control measures, ultimately improving product reliability and safety.
Tabular dimensioning
to save space in dimensioning
Contour dimensioning is a method of dimensioning a part by specifying the lengths of its contours or outlines. It provides an overall description of the part's shape and size without specifying the individual dimensions of every feature. This method is often used for parts with complex shapes where detailing every dimension would be impractical.
It show dimension of given dig. Ex. length meter etc. > chain dimensioning as opposed to datum dimensioning. chain dimensioning: 4 holes in line on a drawing, first hole position dimensioned from the edge, remainder dimensioned from the centre of the previous hole. datum dimensioning: all holes dimensioned from the edge. the cumulative tolerance build up on the chain dimensioning allows for greater overall tolerance build up.
Things like General Dimensioning and Auto Dimensioning