The drawing serves in order that the one who will turn a detail or to build the house, could get the most exact idea of appearance of an object, its building, a ratio of parts, ways of processing of surfaces. One projection for this purpose, as a rule, is not enough. On educational drawings usually carry out three views — main, at the left and from above. Apply to objects of irregular shape also the right-side views and behind.
It is required to you
- - detail;
- - measuring tools;
- - drawing tools;
- - computer with AutoCAD.
Instruction
1. The sequence of implementation of the drawing on a leaf of a Whatman paper and in the AutoCAD program is approximately identical. First of all consider a detail. Define what its foreshortening will give the most exact idea of a form and functional features. This projection will also become its front view.
2. Look whether your detail equally looks if to look at it on the right and at the left. Not only the quantity of projections, but also their arrangement on a leaf depends on it. The left-side view is arranged more to the right of the main thing, and the right-side view — respectively, more to the left. At the same time in a flat projection they will look as if are just before the observer's eyes, that is without prospect.
3. Ways of creation of the drawing are identical to all projections. Mentally arrange an object in the system of the planes on which you will project it. Analyze a subject form. Look whether it is possible to divide it into simpler parts. Answer a question in what shape of a body it is possible to enter completely your object completely or each its fragment. Present how separate parts in an orthogonal projection look. The plane on which an object at creation of the left-side view is projected is on the right side from the subject.
4. Measure a detail. Remove key parameters, establish a ratio between the whole object and its separate parts. Choose scale and draw a front view.
5. Choose a way of construction. They are two. For implementation of the drawing by reception of removal put at first the general contours of a subject at which you look at the left or on the right. Then gradually begin to delete volumes, drawing dredging, contours of openings , etc. At increment reception at first one element is drawn, and then the others gradually join it. The choice of a way depends first of all on complexity of a projection. If the detail at a view of it at the left or on the right represents a pronounced geometrical figure a small amount of deviations from a strict form, it is more convenient to use removal reception. If there is a lot of fragments, and a detail in itself in any figure not to enter, better consistently to attach elements to each other. The complexity of projections of the same detail can be various therefore also ways can be changed.
6. Anyway begin creation of a side view with the lower and top lines. They have to be at the same level, as the respective lines of a front view. It will provide projective communication. After that put the general contours of a detail or its first fragment. Observe a ratio of the sizes.
7. Having drawn the general contours of a side view, apply on it center lines, shadings etc. Put down the sizes. It is required to sign a projection not always. If all views of a detail are arranged on one leaf, then only the rear view is signed. The provision of other projections is defined by standards. If the drawing becomes on several sheets and one or both side views are not on that leaf on which main — they need to be signed.