Transcript DVC 3.34 - Technology NZ

DVC 3.34
Produce working drawings to
communicate production details for
a complex design
Lesley Pearce
Team Solutions
The Auckland University
Nov 2012
Level 3 step ups
• Working drawings are to
communicate design details that
will allow its manufacturing or
construction.
• A suitable level of detail for key
aspects of the design
(depending on complexity and
scale of design it is not expected
to be done at a comprehensive
level)
Key Messages
• At level 8: Students develop an understanding
about how to communicate a set of related
2D, 3D or 4D working drawings/models that
show a suitable level of detailing for a key
aspect of design that allow construction and
assembly of the complex design.
Teacher guidance
To support students to develop the skills and
knowledge at level 8, teachers could:
• Teach this as a stand-alone unit where students
are required to interpret design details from a
design idea. Or allow students to develop these
working drawings from an integrated unit from
either product or spatial design. Students must
be allowed to decide on the views and
production details so this cannot be a class
exercise.
• Ensure student’s designs have multicomponents.
• Show students a variety of working drawings
that allow a design to be
constructed/modelled; architectural plans,
engineering plans, animations, traditional and
computer generated, 2D, 3D and 4D. This will
allow them to select a set of drawings to suit
their designs. (Third angle orthographic,
paraline drawings, perspective drawings,
exploded views, isometric, mechanical
perspective etc)
• A set of related drawings could be of different
scales, different views, 2D, 3D, animations that
all communicate one design outcome
• Allow students to use both 2D and 3D modes
to communicate their design outcome.
• 4D refers to animations, motion graphics
design
• Show students the complexity required at this
level. It is important there is enough suitable
level of detailing (it does not have to be done
at a comprehensive level though)
• Teach students the correct conventions; line
types, construction lines, outlines, section
lines, drawing and text layout, dimensioning
Plus the conventions used by engineers and
architects
• Invest in computer software.
• Purchase high GSM paper, good pencils and
clean instrumental equipment.
Activity
• Using the Achievement Standard would the
following drawing meet the level 3 standard?
• If not why?
Do these drawings meet the evidence required for 3.34?
Do these
drawings meet
the evidence
required for
3.34?
Working drawings
• Working drawings are specialized engineering
drawings that provide information required to
make the part or assembly of the final design.
• Working drawings rely on orthographic
projection and many other graphical
techniques to communicate design
information for production.
Definition
• The drawings from which a design is built
• Assembly drawings maybe pictorial drawings
or orthographic drawings
• An assembly drawing shows how each part of
a design is put together
Parts list
• Consists of an itemized list of all the parts to
assemble one complete unit
• Contains the following:
• (1) part number
• (2) part name
• (3) number of parts req’d
• (4) material
• (5) description
Set of related 2D, 3D and/or 4D
drawings and models
• That show interior and exterior details of the
components and information related to the
construction and assembly of the complex design
• The details to be decided by the student
Complex design
• Spatial or product design with multiple
components
Computer aided design
Summary
• A Working Drawing has the following usual components:
An Isometric Drawing showing the Part Numbers (or Part Labels).
• An Exploded View (or Assembly Drawing) showing where the parts go
and their fixtures.
• An Orthographic Projection (Third Angle) showing the overall and
necessary minor dimensions.
• If you can afford space for Part Drawings or useful Sectional Views to be
included, go ahead and do so. Otherwise you must at least have those in
of your development phase. Just think about the part drawings as a
summary of your conclusions on the physical product project. Showing all
the details, positions, trim lines and dimensions. (Note: Production
Sequences and a Gantt Chart Production Plan need not be present in your
presentation boards, however they MUST be included at the end of your
development phase.
• A Material List showing all the Part Numbers, the Materials used, the
Dimensions and the respective Quantities.
•
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Some Tips and Pointers:
Isometric Drawings: If the product has several components, especially those with components
within each bigger component, you may consider drawing those components and label them
seperately. It is impossible to draw all of them within (with lots of hidden lines) and attempt to
number them off. That will be VERY messy and impossible to read. Finish off with a neat Exploded
Drawing to show how each components come together.
Exploded Views: As long as the parts are aligned consistently (Isometric or Oblique) your exploded
view should look neat. Not all parts can be aligned straight to its connection point. In this case you
can draw your component slightly off, but use lines to create a 'path' to lead it to the connection
point. The example above has everything aligned. For an 'off' example click here. In the linked
example you will find a dowel that is not aligned.
Orthographic Projection: Leader lines should not touch the main drawing and should have a lighter
line weight than the object. A good guide would be at least 10mm away from the drawn object.
Spacing between dimension lines to the next should be consistent. A good guide would be at least
5mm away from the drawn object. Dimensions are usually written 'on' the dimension line. For
vertical dimension lines, the dimensions are usually written on the left of the line following the
orientation of the line.
Material List: Most common mistake is the written dimension. Length = the longest or the largest
dimension. Followed by Width and the smallest dimension is the Thickness. It is worthy to note that
numbering in the material list goes from '1' from the base up.
Students can:
• Produce a set of related drawings that can utilize
two dimensional and three dimensional modes
instrumentally constructed/modelled using either
traditional drafting equipment or computer
applications.
• Use digital animations to support the related
drawings.
• Related drawings show information which allows
construction and assembly of a multi-component
design
• Select the views and modes (traditional
methods or computer applications) that suits
the accepted practice and conventions for the
design context
• Communicate the design details of either a
spatial or product design to a level that will
allow the design to be manufactured or
constructed
• Show exterior and interior details that would
allow production of key aspects of the details
of the design outcome
• Use the correct conventions for either an
engineering or architectural drawings
• Apply drawing techniques with accuracy and
precision
• Select views and modes as suitable and
accepted as practice and conventions
Assessment Specifications
• Students are required to select key aspects of their
designs, the views, modes to produce a set of related
drawings.
• Depending on the complexity of the design and scale of
the design, this is not necessarily expected to be done
to a comprehensive extent, provided there is suitable
level of detailing shown for a key aspect of the design.
• Candidates may use any computer applications. For the
production of working drawings (e.g. Vectorworks,
Solidworks, Archicad, Revit, etc) though animations can
be used as supporting evidence.
• Digital animations can be used to support the
related drawings to help communicate interior
and exterior information related to the
construction and assembly of a multi
component design.