Engineering Drawing part-5

 

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  the margin line  in drawing sheet.

according to SP: 46 (2003)

Border are  20 mm width for sheet size  A0 and  A1

Border are 10 mm  width for sheet size  A2 ,A3,A4,A5

For  Engineering drawing purpose generally  use  A1 sheet




4-Orientation mark

Centering marks on the drawing sheet for the  purpose of facilitate positioning of the drawing for reproduction purpose.

There are minimum four centering marks in a drawing sheet

The orientation mark will coincide with  one of centering marks which can be used for the  orientation of the drawing  board 


5-Grid reference system 

The aim of grid system on the sheet to permit easy location on the drawing such as detail ,additions

Grid along the length should be 1,2,3,4,5......etc
Grid along the width should be A,B,C,D,E......etc as shown in fig 2-1 b

6-Title block

The size of title block according to  B.I.S. is  185 mm X 65mm for drawing sheet.


vertical partition of sheet from  right side  is   20mm , 25mm  and 10mm  as in given fig 2-2

 
Horizontal  partition of  sheet  from top is 10mm,7mm,7mm,7mm,7mm,7mm,20mm




7-Scaling of drawing

Scaling of drawing is an important thing by which we can  draw the big size  plan  in a small drawing 
sheet.
 
Reducing scale 1:2   ,1:5, 1:20 ,1:1000  etc 

Enlarging scale  50:1 ,20:1 ,10:1 etc

full size scale  is 1:1





For  Engineering Drawing part-6



For Engineering Drawing part- 4


Comments

Post a Comment

Popular posts from this blog

Engineering Drawing part-3

Image
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...
Read more

Engineering Drawing part-6

Image
 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 ...
Read more