Mecanica

Technical Drawing
MEC1000
Spring 2006
Instructor: David Anderson

Topics
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Drawing Views
Drawing Standards
Best Practices
Creating Drawings in SolidWorks

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views
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Multi-View Projection - The Glass Box
Third Angle Projection
Two View Drawings
Line Types
Section ViewsAuxiliary Views
Detail Views
Broken-Out Section Views
Partial Views, Cropped Views

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Multiview Projection
• A view of an object is know technically as a

projection

• A projection is a view conceived to be drawn or
projected on to a plane, known as the plane of

projection

• Multiview or orthographicprojection is a system of
views of an object formed by projectors from the
object perpendicular to the desired plane of
projection. Huh?

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Multiview Projection
• The projection of an object.
• Perpendicular lines or projectors are drawn from all points
on the edges or contours of the object to the plane ofprojection.

• Shown below is the projection of an object onto the
frontal plane.

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Planes of projection
likewise,
• the top view is projected onto
the horizontal plane
• the side view is projected onto
the profile plane

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Multiview Projection – The GlassBox
• Placing parallel planes to the
principal planes forms a glass
box (always observed from
outside the box)
• To show views of a 3D object on
a 2D piece of paper, it is
necessary to unfold the planes
such that they lie in the same
plane
• All planes except the rear plane
are hinged to the frontal plane,
which is hinged to the left-side
plane

Spring 2006

MEC1000 TechnicalDrawing - D. Anderson

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Multiview Projection – The Glass Box
• By unfolding the box, six views of the object are
possible.

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Third Angle Projection

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Multiview Projection – Proper number of
Views
• It may not, be necessary to show all six viewsto
completely describe the object.
• In fact, the minimum number of views is preferable.
• How many views are necessary to completely
describe this plate?
• 1?
• 2?
• 3?
• 4?

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Multiview Projection – Two View Drawings
• The answer is 2!

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views –Sectional Views
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We have covered the basic method of representing an object by projecting
views. This allows us to see the external features of an object.
Often times it is necessary to view the internal features, this is accomplished by
slicing through the object and producing a sectional or section view
Section view is always placed BEHIND arrows

Object being
sectioned

Section LineAlways a phantom
line type

View Arrow
With Label
Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Sectional Views
Sectional views are extremely useful in minimizing the number of
projected views. How many views does this object require?

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Sectional Views
Section viewsprovide clear and unambiguous representation of
internal features

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Sectional Views
Section views can reduced the number of views of many
axisymmetric parts to a single view

Spring 2006

MEC1000 Technical Drawing - D. Anderson

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Drawing Views – Auxiliary Views
• Inclined planes and oblique (neither...