mini drafter ppt

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MINI DRAFTER

• TECHNICAL DESCRIPTION

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PRESENTED BY

• RAJAT JAIN

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INTRODUCTION What is a mini drafter? A mini
drafter is an important device used for preparing
drawing quickly accurately. With the use of
mini drafter the drawing of building, apartment,
industries are planned accurately too in very
less time. Mini Drafter a mini drafter is a very
convenient drawing instrument for students since
it combines all the functions of a T-square, set
squares and a protractor. MINI DRAFTER
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HISTORY Drafting machines were present in the
design offices of European companies since the
1920s. It is curious to see how the Encyclopedia
Britannica explicitly specifies 1930 as the year
this tool was introduced, but an advertisement of
"Memorie di architettura pratica" from 1913
places it twenty years before this date-at least
in Italy. OLD AND NEW MODEL OF MINI DRAFTER-
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COMPONENTS OF MINI DRAFTER A drafter consists of
a scale, a scale screw, a scale plate, steel
bars, a bar plate and a clamping mechanism. An
L-shaped scale is graduated in mm along both the
arms. It also carries a degree scale for angle
measurement. The scale is joined to a clamping
mechanism by means of steel bars, the bar plate
and the scale plate in such a way that it can be
moved to the desired location on the drawing
board. A mini drafter with a transparent plastic
scale is recommended for school and college
students.
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MINI DRAFTER ON DRAWING BOARD
Fig. Mini Drafter on Drawing Board
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WORKING OF MINI DRAFTER The uses and advantages
of the T-square, set squares scale and the
protector are combined in the drafting machine.
Its one end is clamped by the means of screw to
the distant longer edge of the drawing board. At
its other the adjustable head (H) having
protractor markings Is fitted. Two blades (B) of
transparent celluloid accurately set at right
angles to each other are attached to the head.
The machine has a mechanism which keeps the two
blades (B) always parallel to their original
position, wherever they may be moved on the
board. The blades have scales marked on them and
are used as straight edges. The blades may be set
at any desired angle with the help of the
protractor (H). A mini-drafter is a smaller
version of usual drafting machine Is used for
class work. When not in use, the arms and strips
may be folded and kept in small cover. Diagram
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USE OF MINI DRAFTER IN ENGG. DRAWING A mini
drafter is an important device used for preparing
drawing quickly accurately. The profession of
civil mechanical engineer is based on mini
drafter.
Description The mini-drafter is a versatile tool
and can be used for almost everything. It can be
used to draw parallel lines, perpendiculars,
inclined lines of any degree with unmatched
speed, it consists of one long scale and one
small scale and the scales are shaped in 'L'
shaped and by a mini drafter we can do 3 kinds of
works 1) Drawing of lines 2) Drawing
perpendiculars for the lines 3) We can use that
as a protractor simultaneously
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• ADVANTAGES OF MINI DRAFTER
• The uses advantages of T- square, set square,
  scale and the protractor are combined in mini
  drafter.
• Horizontal vertical or inclined parallel lines
  can be drawn anywhere on the sheet
• With the drafting machine one can perform a
  series of drawing operations that otherwise could
  only be achieved with a much more complex
  use of the classic ruler scales and protector,
  as, for example,
• Drawing parallel lines, orthogonal lines,
  inclined lines according to a preset angle,
  measurement of angles, etc.

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MODIFICATIONS Roller Scale is the modified form
of mini drafter. As it is small in size and easy
to handle. All the main function can be perform
using roller scale. Flow chart
Roller Scale A roller scale is a handy device
used to draw parallel and inclined lines. It
consists of a broad scale that includes a
protractor mounted on a roller, Fig. 1.6. The
accuracy of this device is not comparable with
the accuracy of a T-square and drafter. However,
it is a speedy device and may be used for
practice in classrooms.
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FUTURE SCOPE

• The future scope of mini drafter and other
  drawing instrument can be imagined as a
  digitalized form of them.
• Digitalization is a need and requirement for next
  generation.
• In present era where everything is becoming
  digitalize, it is the demand of time that
  engineering drawing should be raise from these
  instrument to digitalize software.
• Digitalization of mini drafter can be
  accomplished by learning CAD.
• About CAD-
• Computer-aided design (CAD) is the use of
  computer systems to assist in the creation,
  modification, analysis, or optimization of a
  design.
• CAD software is used to increase the productivity
  of the designer, improve the quality of design,
  improve communications through documentation, and
  to create a database for manufacturing. CAD
  output is often in the form of electronic files
  for print, machining, or other manufacturing
  operations.

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