The full technical drawing contains at least three projections. However the ability to imagine an object on two projections is required both from the technologist, and from the skilled worker. For this reason tasks on creation of the third look of two set constantly occur in examination cards in technical colleges and colleges. Successfully to perform a similar task, it is necessary to know the symbols accepted in technical drawing.
It is required to you
- - sheet of paper;
- - 2 projections of a detail;
- - drawing tools.
Instruction
1. The principles of creation of the third look are identical to classical drawing, drawing up the sketch and creation of the drawing in one of the computer programs intended for this purpose. First of all analyze the set projections. Look what types are given you. When it comes to three types, it is a frontal projection, the top view and the left-side view. Define what is given you. It is possible to make it on arrangement of drawings. The left-side view is arranged on the right side from frontal, and the top view — under it.
2. Establish projective connection with one of the set types. It is possible to make it, having prolonged the horizontal lines limiting a subject contour, to the right when it is required to construct the left-side view. If it is about the top view, continue vertical lines down. Anyway one of detail parameters at you on the drawing will appear automatically.
3. Find the second parameter limiting detail contours on the existing projections. At creation of the left-side view you will find this size on the top view. At establishment of projective communication with a front view you on the drawing had detail height. Means, from the top view it is necessary to take width. At creation of the top view the second size undertakes from a side projection. Plan contours of your object in the third projection.
4. Look whether the detail has ledges, emptiness, openings. All this is noted on a frontal projection which by definition has to give the most exact idea of a subject. Just as when determining the general contour of a detail in the third projection, establish projective connection between various elements. Find other parameters (for example, distance from the center of an opening to edge of a detail, ledge depth, etc.) on a side view or from above. Construct the necessary elements, considering the measures found you.
5. To check, how correctly you coped with a task, try to draw a detail in one of axonometrical projections. Look, the elements of the third look drawn by you on a volume projection how logically are located. Very much can be that it is necessary to introduce some amendments in the drawing. To help check your construction also the drawing taking into account prospect can