5. Procedure for clamping the drafter
• Set the protractor head with
reference mark indexing zero
degree, then fix the clamp of the
mini-drafter at the top left corner
either along the top horizontal
edge of the board or along the left
vertical edge of the board.
• With the drawing sheet placed
underneath the scales of the
minidrafter, fix the drawing sheet
to the drawing board with the
scales of the mini-drafter aligned
either with the vertical or the
horizontal borderlines of the
drawing sheet.
7. Drawing Pencils
• Wooden pencils – are graded and designated by
numbers and letters
• Mechanical clutch pencils (Micro Tip) – Not
allowed
• 6B, 5B, 4B, 3B, 2B, B - in decreasing order of
softness and blackness
• HB, F, H 2H, 3H – Medium grade
• 4H, 5H, 6H, 7H, 8H, 9H – increasing order of
hardness.
• Drawings are done using 2H pencils and finished
with H and HB pencils – to be practiced in this
course.
• Standard leads are 2 mm in diameter.
• Fine line leads are available in .3, .5, .7 and .9 mm
diameters
9. Scale
• Full Scale 1 : 1
• Reduced Scale 1 : 100
1 mm of Drawing 100 mm of real
• Enlarged scale 100 : 1
• 1:2, 5, 10, 20, 50, 100, 200, 500, 1000
10. Layout of Drawing Sheets
• Standard form of arrangement, Important particulars are included
• Facilitate quick reading of important particulars – quick references are
located easily – Drawings are prepared at various locations and
shared
11. Title Block
• An important feature – a must in every drawing sheet – for technical
and administrative details
• Location - Bottom right corner – 170 mm x 65 mm
• Divided into two zones
• Identification zone
• Registration or identification number
• Drawing title
• Name of the legal owner of the drawing, i.e., name of the firm or the company
• Additional information zone
• Indicative items –symbol indicating the system of projection, main scale of
drawing, etc.
• Technical items – method of indicating surface texture, geometric tolerances, etc.
• Administrative items
12. Lettering
• Writing of titles, sub-titles, dimensions, scale and other
details on a drawing is called lettering.
• It should be clear, legible and uniform
• It should be simple, so it can be done with freehand
with speed
• Drawing instruments should not be used
13. Lettering
• SINGLE STROKE LETTERS
• The thickness of the line is obtained by single stroke of the
pencil
• The lines of the inclined letter are drawn at an inclination of
about 75° from horizontal.
• The standard heights for lettering are 2.5, 3.5, 5, 7, 10, 14
and 20 mm.
• The width of the letters is equal to the height in most cases.
• Different for type A and type B lettering.
• In lettering ‘A’ Type the height of the capital letter is directed into 14 parts.
16. Lettering (Type-A)
Note:
The width of letters are selected suitably and are
varying from 0.4h to 0.6h expect for letters M,W and I
The ratio of height to width for most of the CAPITAL
letters is taken as nearly 14:10 and in case of M and
W the ratio can be taken approximately as 14:12.For I
the ratio as 14:6
