Square%20Pyramid%20(cut) - PowerPoint PPT Presentation

About This Presentation
Title:

Square%20Pyramid%20(cut)

Description:

Graphic Communication Square Pyramid (cut) Department of Technological Education Cut Square Pyramid - Problem The given views show the Front Elevation and unfinished ... – PowerPoint PPT presentation

Number of Views:170
Avg rating:3.0/5.0
Slides: 11
Provided by: Raymo148
Category:

less

Transcript and Presenter's Notes

Title: Square%20Pyramid%20(cut)


1
Square Pyramid (cut)
Graphic Communication
Department of Technological Education
2
Cut Square Pyramid - Problem
Department of Technological Education
  • The given views show the Front Elevation and
    unfinished Plan of a cut square pyramid.
  • Draw the following views -
  • The completed Plan
  • End Elevation
  • Surface Development of sides
  • True Shape of cut surface

3
Finding Position of End Elevation
Department of Technological Education
  • Using the Plan and the Front Elevation project
    the position of the End Elevation and show the
    slope of the sides.

1
2
  • Number each of the points in each view.

3
4
1
/4
/3
2
3
/4
/2
1
4
Finding Position of cut on End Elevation
Department of Technological Education
  • Project from the Front Elevation to find the cut
    surface on the End Elevation.

1
2
  • Darken the outlines on the End Elevation.

3
4
1
/4
2
3
/2
1
/3
/4
5
Finding Position of cut on Plan
Department of Technological Education
  • Project from the Front Elevation to find the cut
    surface on the Plan.

1
2
  • Darken the outlines on the Plan.

3
4
1
/4
2
/3
6
Finding True Length of pyramid corner
Department of Technological Education
  • Before the Development can be drawn it is
    necessary to find out the True Length of the
    corner of the pyramid so that accurate sizes for
    the development and the cut points can be found
  • Draw a curve on the plan with the centre being
    located at the centre of the pyramid, the radius
    being measured at one of the corners, and the end
    point of the curve being the centre line.
  • Project the point found onto the Elevation
    baseline and draw a generator to the apex of the
    pyramid.
  • Project the cut points from the elevation onto
    this True Length line.

7
Drawing the outline of the Development
Department of Technological Education
  • Indicate where the development is going to be
    placed, and then draw the first generator to
    indicate one corner of the pyramid.

1
  • Measure the length of the corner of the pyramid
    using the True Length line and draw a curve on
    the Development at this size.

2
  • Step off the length of each of the sides of the
    pyramid onto the Development.

3
  • Draw generators to each of these points to
    indicate the fold lines
  • Number each of the points.

4
1
8
Drawing the cut on the Development
Department of Technological Education
Alternative Layout
  • Step off from the True Length line the distance
    from the apex of the pyramid to each cut point
    and transfer these sizes to the correct
    generators on the Development.

1
2
  • Join each of the points to show the developed
    shape of the cut. Also add the flat edges to the
    base of the pyramid on the Development.

3
  • Darken the outlines on the Development.
  • Add the fold lines to complete the view.

4
1
9
Drawing the True Shape
Department of Technological Education
  • To find the True Shape, project the cut points
    away from the Front Elevation at right angles to
    the cut.

1
2
  • Draw a datum line on the True Shape parallel to
    the cut line of the Front Elevation and at right
    angles to the lines just projected. Use the
    centre line of the plan as a datum line.

3
4
  • Measure the vertical distances from the datum to
    each of the cut points on the plan. Transfer
    each of these sizes on to the True Shape.
  • Join each of the points found to produce the True
    Shape. Complete the view by darkening the
    outlines.

10
(No Transcript)
Write a Comment
User Comments (0)
About PowerShow.com