I did your mom.... a favor by making you.... a sandwich:))
Just because they cross over each other doesn't mean they aren't still called lines.
couple of reasons.... if you are drawing and dimensioning with a computer program the dimension will be inaccurate... If it is mechanical drawing then the fabricator would not have enough information to accurately measure the component. ie a circle turned a few degrees away from perp. would appear to be an ellipse. and may actually dimension that way
rise over run. That would be a 4" rise for every 12" run. In other words, 4" vertically over 12" horizontally
First you have to set up a proprtion. 45 over x equals x over 5. Then you get x squared equals 225(45*5). Finally you have to find the square root of 225 which is 15.
18" o.a.
boring
For putting to many dimension on top of the dimension!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Things like General Dimensioning and Auto Dimensioning
Dimensioning standards are standards on how to dimension a working drawing.
Tabular dimensioning
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
Over-dimensioning refers to the practice of designing or specifying components, systems, or structures with dimensions or capacities that exceed the actual requirements for their intended use. This can lead to increased costs, material wastage, and inefficiencies, as larger or more robust solutions are often more expensive and may not provide additional benefits. While it can enhance safety margins, excessive over-dimensioning may detract from optimal performance and sustainability. Balancing adequate safety with cost-effectiveness is crucial in engineering and design.
Baseline dimensioning is a method of dimensioning in technical drawings where all dimensions are referenced from a single baseline, reducing the chance of errors due to accumulation of tolerances. It helps to maintain clarity and consistency in the layout of dimensions on a drawing.
they are used by showing where it is
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.