Certain features on a Engineering Drawing requires specific ways of indication. For example, holes require center lines to identify the center and show that it is round. Hidden detail are shown with a certain line type to avoid confusion with visible edges. Most CAD Software packages will have these different line types predefined as layers. Depending on the layer chosen, the line will display it in a certain way. Often, most drafting companies will have their own custom layers with different colours, however the final product on paper will or should be as discussed below.
The continuous thick line is used to show visible outlines or edges of a component or assembly. This line may be made thin if the drawing is congested and allot of lines are so close to each other that the clarity of the drawing is negatively influenced. The continuous thin line is the most frequently used line type on Engineering Drawings. These lines are solid and has no break in them. Here is the list of cases where the continuous thin line will be used:.
Freehand lines shows breaks or cuts in parts or assemblies. The edge of the partial or interrupted view is indicated with a freehand line. The Continuous Thin Zigzag Line shows a break line. If a part needs to be shortened with a break for ease of visibility, a break can be made using this line. The Dashed Line is used to indicate hidden details like hidden outlines and hidden edges.Sabbath school lesson 2020 daniel pdf
The dashed line may be either thick or thin, but only one type thick or thin should be used on a single drawing or set of drawings. The Thin Chain Line is used to indicate center lines, the lines of symmetry and also trajectories.
Often this line is used as a point of reference on engineering drawings. Sectional cutting planes are indicated with a Thin Chain Line with Thick ends. This helps to identify the plane in which the part or assembly is cut. If the cut line is on more than one plane, the change in direction should also be indicated with thicker ends. A Thick Chain Line is used to indicate special requirements on a surface.
This line does not form part of the geometry of the part, but is rather used to identify the surface. This is especially useful when the component has a reference to the existing components. It is also used to show alternative or extreme positions. On drawings where bends are indicated, these lines are used to show the initial outlines before forming or bending.
One can also use this line to indicate parts or components situated in front of the cutting plane, to give reference to the part shown. In Engineering Drawings, a line is not just a line. The different lines have meaning to them. The above mentioned line types are according to the requirements of ISO standards and many other national standards.
Skip to content Certain features on a Engineering Drawing requires specific ways of indication. Continuous Thin Line The continuous thin line is the most frequently used line type on Engineering Drawings. Here is the list of cases where the continuous thin line will be used: Imaginary lines of intersection Dimension line Projection lines Leader lines Hatching Outlines of revolved sections Short center lines as opposed to the chain line Bending lines Continuous Thin Freehand Line Freehand lines shows breaks or cuts in parts or assemblies.
This line does not form part of the geometry of the part, but is rather used to identify the surface Thin Chain Double Dashed Line The Thin Chain Double Dashed Line is used to show adjacent components.
Orthographic Projections - Basics (PPT), Engineering Drawing Mechanical Engineering Notes | EduRev
In their business, engineers have to prepare drawings to convey their ideas. The graphical language used by engineers is called as Engineering Drawing. Just as a picture speaks thousands of words, a complete technical drawing tells everything about the geometry of the product. These are explained on next slide. Drawing sheets are available in standard sizes. They are made up of soft wooden platens fastened together by two cross plates battensFig. The working surface of the board is planned perfectly.
A shorter edge of the board carries a hard ebony strip fitted in a groove. This straight ebony edge, perfectly lined up with the edge of the drawing board, provides the guide for the T-square.
It is mounted on a drawing board at the top left corner. A drafter consists of a scale, a scale screw, a scale plate, steel bars, a bar plate and a clamping mechanism, Fig. It consists of a stock and a blade joined together at right angles, Fig. Set-squares Two set squares i 45 set-square and ii 30 60 set-square, are the most common drawing instruments. A protractor is usually included in a 45 setsquare, Fig. The 30 60 set-square may include French curves in it, Fig.
Protractor Protractor is used to draw and measure the angles. It is available separately or as merged in 45 set-square. Roller Scale A roller scale is a handy device used to draw parallel and inclined lines. It is a speedy device and may be used for practice in classrooms.To browse Academia.Rules For Dimensioning - Mechanical Drawings
Skip to main content. Log In Sign Up. Engineering Drawing for Beginners. The primary problem faced in learning and teaching of engineering drawing is the limited availability of text books that focus on the basic rules and specifications in relation to the drawing methods practiced in Bangladesh.
This handbook is prepared with the primary aim to elaborate necessary basic rules and regulations of engineering drawing that is necessary for students of every engineering discipline. This book is for beginners to introduce them with different elements of engineering drawing.
Several worked-out examples are provided along with every chapter and also every chapter includes some exercise and assignments to be practiced by the learners. The course Engineering Drawing is extremely important as it is the language of engineers, technicians, designers and sanitarians. This handbook is devoted to provide general aspects of engineering drawing like lettering, geometric constructions, dimensioning, scaling, orthographic and isometric projections and sectioning.
The handbook is prepared taking aid from a number of textbooks and articles mentioned in bibliography section.The village of pantano, municipality of terni (tr) umbria
Most of the figures are drawn using AutoCAD, a few of them are collected from Google image search and some are taken from the textbooks. For further reading, students are encouraged to refer books which are listed in the bibliography section. Acknowledgement The author is delighted to express his thanks and gratitude to Prof.
Author is also grateful to the present chairman Md. Belal Hossain and his colleagues of the Department of Civil Engineering and of the Department of Agricultural and Industrial Engineering for inspiring him in completing this handbook. And obviously it is the mercy of the Almighty Allah that the material has finally come into a complete form. A drawing can be prepared either using free hand or using engineering instruments or using computer program. Artistic Drawing 2.
Engineering Drawing 1. Example: Painting, Posters, arts etc. It is a two dimensional representation of a three dimensional object. In other words, The art of representing a real or imaginary object precisely using some graphics, symbols, letters and numbers with the help of engineering drawing instruments is called engineering drawing. The art of representing engineering objects such as buildings, roads, machines, circuits etc.
It is used by engineers and technologists. An engineering drawing provides all information about size, shape, surface type, materials etc. Example: Building drawing for civil engineers, Machine drawing for mechanical engineers, Circuit diagrams for electrical and electronics engineers, computer graphics for one and all etc.
Table 1. Can be understood by all. Need some specific knowledge or training to understand. Scale maintaining is not necessary Scale maintaining is necessary No special requirement of engineering instruments.Title : Engineering Drawing.9mm oal 124
Prepared By : Ashish Shah. Appd By. Slide No: 5. Slide No: Symbology is also used to define welds. The relevant standard is ISO All CAPS.
All Decimals. Select a front view that best describes the part. Remove hidden lines always, unless absolutely necessary. Do not duplicate dimensions. Do not dimension to hidden lines. Place dims between views if possible. No dims allowed on body of part. Place all dims for feature in one view if possible. Dim lines cannot cross dim lines. Dim lines should not cross extension lines. Extension lines can cross extension lines.
Center marks in view s only where feature is dimensioned only. Centerlines in view s where feature is dimensioned. Learn more about Scribd Membership Home. Read Free For 30 Days. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers.
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Engineering Drawing Basics
Related titles.Copy embed code:. Automatically changes to Flash or non-Flash embed. WordPress Embed Customize Embed. URL: Copy. Presentation Description No description available. Ramesh, M. Hence it has become the Best Media of Communication not only in Engineering but in almost all Fields. Geographical Drawings maps etc. Botanical Drawings plants, flowers etc. Zoological Drawings creatures, animals etc. Portraits human faces, expressions etc.
Engineering Drawings, projections. Machine component Drawings Building Related Drawings. Engg terms Plan, Elevation- Civil Engg. It is done manually or with the aid of a computer. It is done manually. So it is necessary to draw the front view, top view, bottom view, right side view and left side view. It is done with the aid of a computer.
Trimmed drawing paper is called as drawing sheet. In this, the inclined cut of the lead is turned inside as shown in the figure. Note: Pro-circle can also be used for drawing small circles up to 30 mm diameter. In this the inclined cut of the lead is turned outside as shown in the figure. For drawing circles of to mm diameter both the needle point leg and the pencil leg should be bent at the knuckle joints so as to be perpendicular to the surface of the paper. For this, the lower part of the pencil leg is detached and lengthening bar is inserted in its place.
The detached part is then fitted at the end of the lengthening bar. The right vertical edges of drawing board, pading sheet and drawing sheet should coincide as shown in the figure. Use double sided tape instead of cello tape.After you enable Flash, refresh this page and the presentation should play. Get the plugin now. Toggle navigation. Help Preferences Sign up Log in.
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Title: Engineering Drawing. Description: An engineering drawing, a type of technical drawing, which is used to fully and clearly define requirements for engineered items with scales. Engineering drawing Tags: drawing engineering orthographic. Latest Highest Rated. Title: Engineering Drawing 1 Engineering Drawing 2 What is engineering drawing An engineering drawing, a type of technical drawing, which is used to fully and clearly define requirements for engineered items with scales.
Easy to understand Since a picture is easiest method than thousand words, a technical drawing is a much more effective tool for engineers than a written plan.
Engineering drawings is used in all engineering fields, including, but not limited to, civil engineering, electrical engineering, mechanical engineering and architecture. Just pencil and paper. Scale is approximate, not accurate, but the sketch should still look like the object.
Engineering Drawing Made with drafting tools Ruler, set squares, protractor and compass. Scale should be accurate and the drawing carefully made. The figure formed by joining, in correct sequence, the points at which these lines meet the plane, is called the projection of the object.
The lines from the object to the plane are called projectors. Usually a front, side and plan view are drawn so that a person looking at the drawing can see all the important sides. Orthographic drawings are useful especially when a design has been developed to a stage whereby it is almost ready to manufacture.
The view so formed is known as the orthographic projection.After you enable Flash, refresh this page and the presentation should play. Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play.
Engineering Drawing BASICS
View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Title: Engineering Drawing Notes. The engineering drawing is the specification for the component or assembly and Tags: drawing engineering notes.
Latest Highest Rated. They should use appropriate technical language, and be complete and accurate in every detail. They should be authored in such a way as to have only one possible interpretation. The points of the arrowheads on leader lines and dimension lines must make contact with the feature object line or extension lines which represent the feature being dimensioned.
The standard size ratio for all arrowheads on mechanical drawings is 31 length to width. Dimensions should not be placed within the part boundaries unless greater clarity would result.
They are values that have been derived from other dimensions and therefore should not be used for calculation, production or inspection of parts. The use of reference dimensions on drawings should be minimized. Dimensions nearest the object outline should be at least.
Cylindrical holes, slotted holes, and cutouts that are irregular in shape would normally be dimensioned in views where their true geometric shape is shown. For instance, when a slot that has a given width by a specified length, or a chamfer that has equal sides.2008 ford ranger wiring harness diagram base website wiring
When used to imply the word by, a space must precede and follow the X symbol. If the same feature is repeated on the drawing such as 8 holes of the same diameter and in a specified patternthe number of times the instruction applies is called out using the symbol X.
It has been proposed. Note that this symbol is not used in the ISO international standard. Base Detail 26 Threads and Screw Fastening cont. The tolerance, or accuracy required, will depend on the function of the part and the particular feature being dimensioned.
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