Drawing instruments are used to draw straight lines ,circles , and curves accurately concisely
The drawing tools are like drawing board, mini drafter, instrument box containing compass,divider etc,.. set squares,protractor,french curves, drawing sheet,pencils,erasers.....
DRAWING STANDARDS
- Drawing standards are set of rules that govern how the technical drawings are represented
- these are used so that every one can commonly understand the meaning of drawn picture
Drawing sheet
we have many types and sizes of drawing sheets.. like A4,A3,A2,A1,A0 etc
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIExALYhGQA0SHGXcVLUavUrpjdeBXCrnNdF9pXoJRBmxsoFKzkhzssLu2zYfDOzjXZq3rD33RYNYZ2wkLbYjG3g-w_iMGkGgsG-CMCXuJ5rJ35hMrNBBbivAWH0aAotr6Zl2Y3KNBUIQi/s320/Picture1121.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdb6sXQk_8ALtXLB5NTZNMbHgfqRroeM7LclYcOUgCO9fr79MPOM12kQEBk4qA29WmIDBVEm5zNK7C1AumLBOHL6D3Ilci9jntK0vH9iS19MjUbl7v81ps5FIxeL3CuHNm-Sqx6x7FaP3l/s320/Picture1213.jpg)
while in the drawing sheet .. first we have to draw border lines and title box and then we have to start drawing
lettering
lettering and numbering should be in a perfect manner.. for example in this figure.. the upper and lower case letters are neatly draw
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8CEKvLYj5r4E_1-F0C5FuLWz3RYzlvPFVKhPF1sdjIklRpzVOR-UyjAdf7qzAeKJw4fHSWnNC7nOeUEN0D96uQE8WxBlKXxE1lVQj8IIoD5M-0mzqm13zc9j31piuFQpAvTpd6W5-KgaO/s640/Picture5.jpg)
lines and its types
basically lines which are used in the representation of the diagrams are of mainly 4 types they are
- Visible line : represent features that can be seen in the current view
- Dimension line ;Extension line;Leader line: indicate the sizes and location of features
- Hidden line : represent features that can not be seen in the current view
- Center line: represents symmetry, path of motion, centers of circles, axis of axisymmetrical parts
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