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Q: What is dimensioning what is general rules of dimensioning?
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What are the perimeter rules?

Perimeter = The sum of the lengths of each side. There may be special rules applicable to selected shapes, but the above is the only general rule - in answer to the general question.


Which type of line is never crossed by any other line when dimensioning an object?

Rigth line


When you use induction you form general ideas and rules based on your experiences and what?

Logical inference.


What is the difference between datum dimensioning and chain dimensioning?

Datum dimensioning is where a single reference point is used for all dimensions in a single direction. E.g. If Point A is declared the reference point, then Points B, C, D, etc, will all be measured relative to Point A, not to each other. Chain dimensioning is where each point is measured to the next. E.g. Point B is measured from Point A, Point C is measured from Point B, Point C is measured from Point B, and so on. The problem with chain dimensioning is that each measurement relies on the accuracy of the previous measurement. If there is a tolerance associated with each measurement (+/- X), then the tolerance for each subsequent dimension accumulates and becomes the number of measurements times the tolerance of each measurement (+/- n*X). Since datum dimensioning uses only one reference point, the tolerances cannot accumulate as each measurement is isolated, rather than relying on the accuracy of the previous measurement. Common practice is to only use datum dimensioning in design drawings to ensure greater accuracy over the entire design without requiring tighter tolerances.


What is dual dimensioning?

Multi dimensions Or more easy using both metric and inches to represent dimensions