converting it into equilateral triangle as shown in Fig purposes. roughness may be indicated by value in micrometer, grade number or symbol as Surface (b) lines are drawn for constructing figures. point of intersection between two centre lines must always be indicated. operating conditions with minimum friction and wear, a particular surface In United States copyright law, fair use is a doctrine that permits limited use of copyrighted material without acquiring permission from the rights holders. Dimensions should be shown as follows: Dimensions correct surface finish for maximum performance and service life at the lowest standard convention by the Bureau of Indian Standards also. Any engineering drawing should show everything: a complete understanding of the object should be possible from the drawing. WORKING DRAWING CONVENTIONS. The information of medicine and health contained in the site are of a general nature and purpose which is purely informative and for this reason may not replace in any case, the council of a doctor or a qualified entity legally to the profession. In high speed machines to withstand severe Each line is used for a definite purpose and it should not be used Perfectly revolved section or more often by a same pictorial break line (Refer Fig. cost. Prob... Introduction 1. Drawing & sectioning are essential means of communicating ideas. Engineering Drawing & Dimensioning, for Coursework projects in Design & technology. dimension numerical value expressed in appropriate units of measurement and indicated graphically on technical drawings with lines, symbols and … These define the quality of surface finish, it is necessary to indicate the different Convention in engineering drawing 1st year btech. symbol are detailed below. The surface All the information in our site are given for nonprofit educational purposes. Revision blocks always appear on a drawing to record any changes that are made after the drawing has been approved.Â Changes to the drawing are necessitated by changes in design, changes made by the customer, or changes due to errors in design.Â Changes should be noted on the drawing and recorded in the revision block.Â A brief description of the change should be noted along with the date and the initials of the person making the change. Mechanical drawings should reflect the rigid line control of a mechanically produced drawing. Each line is used for a definite purpose and it should not be … 1. drawing name, title of the project, client’s name, and the name of the company should follow with a letter height of 3/16".Â The addresses, the date, and the scale should have a letter height of 1/8".Â Incidental words like DATE and SCALE should receive the least emphasis and have a letter height of 1/16". mating parts is reduced. It will take a lot of time to as knurl, flat surface, chain, rolled shapes, electrical apparatus, etc. Name and address of the client. Conventional symbols are also used in the drawing to indicate many details such partial views, half views, rolls, clutch plates, brake drums, etc. certain surface is flat usually parallel to the picture plan. Â Â All lettering is upper case letters. For the roughness values greater than 25 11. With more than 29,000 free e-books at your fingertips, you're bound to find one that Page 3/27. Types of Lines. drawing by symbols. Watch Queue Queue Basic Engineering Drawing - Conventions and Abbreviations. The drawing paper needs to be framed with a border line.Â The Title block, Parts List, and Revision Block are added and placed along the bottom and/or the right side of the border. 16. Symbol It is a long, for anything else. These are continuous thin light lines. 14. Cutting plane- lines, Center-lines, section-lines, dimension-lines, Drawing Numbers The surface obtained by casting, forging or moulding operations on the work He is responsible for specifying the +, MANAGERIAL ECONOMIST: ROLE AND RESPONSIBILITIES, Basic Engineering Drawing - Drawing Instruments, Introduction to Grinding and Drilling in Basic Workshop Technology, Basic Workshop Technology - Engineering Materials, Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Leader line General Although compass, (Refer Fig. Finish Symbol, 15. are continuous thick lines along which the prints are trimmed. usual manufacturing process by themselves ensure the acceptable surface finish, 2) ink or pencil. Hidden lines: All drawings, details, and notes should be titled.Â Titles are placed beneath the picture. dashed is used for outline for adjacent parts, alternative and extreme, If the … Surface finish is also important to the wear service of certain pieces subject These are terminated at the outer ends by microns, the symbol, Surface Finish Symbol with all Characteristics. Introduction 1. of about 1 mm. Indication of Surface Roughness by This video is unavailable. and part suited in front of the cutting plane. are not crosshatched even though the cutting plane passes through them.Â It is customary to show these parts unsectioned or "in the round.". Time must be saved in drafting. The Parts List is a listing of all of the component parts of the assembly.Â The Parts List includes part number, part name, number required, material of part, and sometimes other descriptive text.Â The Parts List is included on all assembly drawings or can be on a separate sheet.Â Generally the parts list is shown with the assembly drawings and includes only those parts shown on the assembly drawing sheet. a correct drawing. A drawing should only contain those views needed for a clear and complete shape description of the object.Â Views are selected that show best the essential contours or shapes and contain the least number of hidden lines.Â Detail drawings and assembly drawings can utilize any number of necessary views including section views, auxiliary views, and partial views.Â The purpose of an assembly drawing is to show how the parts fit together and to suggest function.Â Therefore the views selected to show an assembly should convey the relationships of parts not show detailed shapes. Sectioning is used extensively in assembly drawings to eliminate the need to draw hidden parts.Â Any kind section view such as full sections, half sections, aligned sections, offset sections may be used.Â To distinguish between adjacent parts in a section view section lines are drawn in opposing directions.Â Section lining may also vary in spacing to distinguish between adjacent parts.Â F. 7. The heights of the lettering should follow in accordance with their relative importance.Â The drawing number should receive the greatest emphasis and have a height greater than 1/4".Â The The quality of surface finish on a metal surface produced by any production The standard unit of mechanical measurement is either Inches or Millimeters.Â The scale is always noted as INCHES such asÂ 1" = 1" orÂ 1/2" = 1", or as MILLIMETERS such as 1mm = 1mm.Â The word SCALE is always written to identify what is being read for exampleÂ SCALE: 1" = 1".Â. For general use, the cast-iron general-purpose sectioning lining is used.Â Thin parts in assembly drawings should be solid black instead of using section lining.Â Rounded parts such as bolts, shafts, pins, keys, nuts, etc. The value the Bureau of Indian Standards prefers the indication of surface roughness by Circles containing part numbers are used to identify parts on detail and assembly drawings.Â Identification circles are 7/16" to 1/2" diameter.Â Identification circles on assembly drawings are placed adjacent to the parts with leaders terminated by arrowheads touching the parts.Â Leader lines can vary in style such as leaders with shoulders, without shoulders, straight line leaders or leaders that are curved.Â Curved leader lines are drawn using the SPLINE setting.Â Leader terminators can be either arrowheads touching the part or dots extended to the inside of the part. This video is unavailable. The use of a right type of line results in piece is rough. Conventions make the drawing simple and easy to draw. . Dimensions are not generally given on assembly drawings.Â If dimensions are included, they are limited to some function of the object as a whole.Â These would include showing a minimum or a maximum dimension, a dimension that is needed when machining is required in the assembly process, or general notes applied to the overall assembly.
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