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Engineering Drawing part-6

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 Lines, Lettering And Dimensioning Lines - There are so many lines are used in Engineering drawing ,which are given below. 1- Outlines 2- Margin lines 3- Dimension lines 4- Extension or Projection lines 5- Construction lines 6- Hatching or section lines 7- Leader or pointer lines 8- Border lines 9- Short Break lines 10-Long Break lines 11-Hidden or dotted lines 12-Center lines 1- Outlines- Lines which represents the outline or border of  the object that is called outlines It is also called principal lines. It  is continuous thick or wide lines  2- Margin lines Margin lines  are  continuously thick line. These lines are also wide lines. 3- Dimension lines- Dimension lines are continuous thin lines. These lines have arrowheads  which touching the outlines. 4- Extension or Projection lines  Extension or Projection lines are also continuous thin lines  These lines are extended about 3mm  beyond the dimension lines 5- Construction lines ...
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Engineering Drawing part-5

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  Ch-2 Sheet Layout for  Drawing Sheet Layout There are some important terms  which  decide  the  proper drawing and sheet layout . All terms are given below- 1- Sheet Size 2- Margin 3-Border Lines 4-Orientation mark 5-Grid reference system  6- Title Block  7- scaling of drawing 1-Sheet Size Sheet  size of drawing is recommended by the Bureau of Indian standards (B.I.S.)are given  below A 0  (841 mm x 1189 mm) A 1  (594 mm x 841 mm) A 2  (420 mm x 594 mm) A 3  (297 mm x  420 mm) A 4  (210 mm x 297 mm) A 5  (148 mm x 210 mm) For Engineering drawing  purpose  generally use  A 1  (594 mm - 841 mm) size All dimensions are in -mm 2-Margin Margin is provided  in the drawing sheet before make a drawing Margin gives the trimmed size of  the drawing sheet. Margin is  generally  taken (10mm-20mm) 3-Border Lines Border line sketch  10 mm- 20 mm  inside from  t...
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Engineering Drawing part-4

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CH-1  Drawing instruments and their uses Scale 1- Scale is a measuring instrument by which we measure the distances . 2- It is made of wood ,steel,celluloid or plastic or card board. 3- Stainless steel scale are more durable . 4- Scales are (15 cm long and 2 cm wide ) or  (30 cm long and 3 cm wide ) 5- Scales are in common use  is 1 mm thick. 6- The card board scale are available in a set of 8 scales   Protractor 1- protractor  of transparent  celluloid are common use .. 2-It is also made of wood and tin. 3- They are flat and circular and  or semicircular in shape. 4- It  have 0 - 180  degree angle presentation in both sides  5- Its center o is mention at that point 90 degree exist at the top  Protractor  Drawing Paper 1- Drawing paper are available in many varieties 2- For ordinary pencil drawing the paper selected should be tough and strong 3-It should be uniform in thickness and have good whiteness 4- when the  rubber e...
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Engineering Drawing part-3

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CH-1  Drawing instruments and their uses 3-Large size divider The divider has two legs hinged at the upper end and is provided with steel needle at both lower ends. It does not have any knee joints in there arms.   Use  of large size divider 1-It is used to provide curved or straight lines in two desired number of equal parts. 2-It is used to transfer the dimensions from one part of the drawing to another part  of the drawing. 3-It is used to set the distance from the scale to drawing. This device is very important for drawing because it provide exact dimensions  and measurements.  4-Small bow divider- The small bow divider is adjusted by nut at the top of the instrument ,it is very convenient for marking minute divisions and large number of short equal distance. 5- Lengthening bar  Lengthening bar is used for circle of more than 150 mm radius  It is used  when the lower part of pencil leg is detached and the lengthening bar inserted inits pl...
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Engineering Drawing part -2

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CH-1  Drawing instruments and their uses 3-Set -Squares The set squares are  made of wood, tin and plastic .commonly celluloid or plastic are used  because they retain their shape and accuracy for a longer time. There are two types of set squares are used  1-A set square triangular in shape  which have angle 45-90-45 degree  and 250 mm edge length 2- A set square triangular in shape  which have angle 30-90-60 degree and 200 mm edge length Use of Set Squares 1- Set squares are used for drawing all straight line except the horizontal line because horizontal line draw with T-Squares . 2-vertical lines can be drawn by the help of T-Squares and Set-Squares 3-By using of set squares a circle can be divided in so many parts. 4- It can draw perpendicular lines easily . 4- DRAWING INSTRUMENT BOX The drawing instrument tools contains so  many tools which are given bellow 1-Large size compass 2-Small bow compass 3-Large size divider 4-Small bow divider 5-Len...
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Engineering Drawing

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Engineering Drawing by Er Amit sir CH-1  Drawing instruments and their uses   Introduction of  drawing For any drawing or construction of building ,instruments have take an important role.with the help of an instrument we prepare drawing easily and accurately. The accuracy of any drawing depends  on the quality of instruments.good quality instrument gives good drawing. Drawing instruments- Drawing instruments which are used for drawing purpose are given bellow. 1-Drawing board 2-T-suare 3-Set squares  30 to 60 degree & 45 degree 4-Drawing instrument geometry box which have containing instruments large size compass with interchangeable pencil and pen , small bow compass,large size divider,small bow divider,small bow ink  pen , inking pen 5-Protractor 6-Scales 7-Drawing papers 8-Drawing pencils 9-Eraser 10-Duster 11-Drafting Machine Drawing board- The shape of drawing board is rectangular and this board is made of strings of well seasoned soft wood about ...
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