In order to manufacture any product or part of a product, it is first necessary to develop its design, that is, a drawing or sketch, which experts are guided by during their manufacture. Only then will the details be homogeneous, high-quality and consistent with their technical and other characteristics. In our material we will tell you how the sketch differs from the drawing and draw the main distinguishing characteristics of these two documents.
What is a sketch?
A sketch is a sketch (drawing) of a part, object or structure by hand in compliance with the approximate proportions of the future product. But in order to fully understand the difference between a sketch of a part and a drawing, one should delve into the essence of the sketch in more detail. In the sketch, despite the fact that the drawing itself can be approximate, the values specified in it should be clearly defined so that those performing the work of manufacturing the part (product), being guided by these sizes and mentioning other (also verified) features , were able to make a full-fledged and working part (product), fully suitable in its technical and other characteristics for its further use.
The sketch is also used if it is necessary to produce only one particular part or to develop a full-fledged production drawing on its basis. If the products or parts are planned to be produced on a production scale (in large quantities), for this, on the basis of previous developments, studies, refinements (sketches), a drawing is drawn.
What is a drawing?
A drawing is a fully developed document with a detailed technical and other description of a part (product, construction). In fact, this is the same sketch, but made using special drawing tools and in accordance with generally accepted drawing rules. The detail in such a document is 100% worked out, all segments and parts in it are carefully calibrated and printed on paper in predetermined proportions, with a decrease (or increase), based on the rules and ratios of scaling.
An understanding of how a sketch differs from a drawing is laid down in the following. Any part of the unit, as well as the unit or the unit itself, launched into mass production, must have its own working drawing, and not a sketch, which guides specialists in the process of its production (manufacturing). Qualitative are considered only those components, parts, assemblies that are made in strict accordance with the working drawings developed for production. Any discrepancies with the drawing in size and other features give the right to call such a product substandard (defective).
Common in sketch and drawing
So, what is the difference between a sketch and a working drawing of a part? First of all, by careful study and observance of proportions. But there are clearly visible similarities in these two documents, for example:
- On that and on another document there is an image of a future detail.
- In both cases, the figure is supplemented by the dimensions of all parts of the part.
- Both the sketch and the drawing contain information about the surface and the material from which the part is to be made.
- They both contain the main inscriptions.
- Both of them contain information on permissible errors.
The difference in sketch and drawing
From the next section it will become even more understandable how the sketch differs from the working drawing. In particular, the main differences between the two documents are as follows:
- In precision execution. If you can sketch the sketch by hand or modify it using hand-drawn lines, then the drawing is the final document that does not require revision and is made using drawing tools or special computer programs created specifically for drawing.
- If only conventional proportions of the part are observed in the sketch, then the drawing is a full-fledged view of the part with exact proportions, reduced or enlarged according to all the rules of scaling. Some drawings may be 100% identical in scale to parts.
- In the design. The technical part of the drawing contains much more detailed information about the product.
Total
For the final comparison of the sketch and the drawing, we decided to create a table in which the main differences between the two drawing documents could be fully traced.
Sketch | Drawing |
Made by hand or using a regular ruler, with manual refinement of the bends | It is done exclusively with the help of drawing instruments or special computer programs. |
Accuracy lies only in some proportions. | Accuracy lies in everything: in proportions, in size, in scale ratio |
Only key features and characteristics are being worked out. | Contains a detailed case study with a mention of the smallest features and characteristics |
The design of the technical part contains only general information. | The design of the technical part contains detailed and more detailed information about the future product |
In some cases, it can be finalized during the manufacturing process, with some adjustments and comments on their introduction | Always the final document. The values specified therein and other information are not subject to any adjustments. A part (product) must always be made strictly according to the drawing. All errors should be within the scope provided by this drawing. |
Conclusion
As any draftsman would say, no matter how the sketch differs from the drawing, without a sketch there would be no drawing as such. Indeed, in order to work out their drawing, draftsmen first have to sketch out a sketch in any case, and then, based on it, create a full-fledged drawing.
As practice shows, for many experienced turners or architects, who are most often guided by such documents in the manufacture of parts or the construction of various buildings, it makes no difference what distinguishes a drawing from a sketch. The main thing for them is that all sizes are correctly displayed in the document. Often in the repair shops, the machinists themselves, literally on the go, have to create sketches for the details. But from this the quality of their products does not fall at all. The same can be said about specialists in the field of construction.