Presentation on theme: "The Gordon Schools Graphic Communication Technical Department."— Presentation transcript:
1The Gordon SchoolsGraphic CommunicationTechnical Department
2Cut CylinderThe views show the Front Elevation and part Plan of a cut Cylinder
3Finding position of End Elevation Draw the outline of the End Elevation.The dimensions for the End Elevation should be projected from the Elevation and Plan.
4Finding Generators on Plan Divide the Plan into 12 areas by using 30o and 60o lines.121111029Number each of the points found384756
5Drawing Generators onto Elevation Project each of the points from the Plan onto the Elevation base.129876543Number each of the points on the Elevation making sure that the numbers correspond with those on the Plan.910111212387654
6Drawing Generators onto End Elevation Repeat the previous process for the End Elevation.129876543101112Make sure that the numbers used are correct and that they correspond to the numbers used on the Elevation and the Plan.768910115432112
7Finding points for cut surface on End Elevation Project where the generators on the Elevation cross the cut line of the Cylinder over to the correct lines on the End Elevation.1298765410111233Indicate each of the found points with a small dot.675849310211112
8Drawing cut surface on End Elevation Draw a smooth curve through each of the 12 points found.129876543101112Darken the outlines of the End Elevation.If the Cylinder is solid the End Elevation will require the cut surface to be cross hatched.675849310211112
9Development of Cylinder (1) Draw a base line for the Development. If possible make this line level with the base line of the Elevation and End Elevation.1212987654312Draw a line to indicate where the first generator of the Development will go.Step off the distance from each of the points on the Plan onto the Development base line.
10Development of Cylinder (2) Draw generators through each of the points found.12111Number each of the generators. Choose carefully where to cut the Cylinder. It is normal to choose to cut the Cylinder on either the longest or the shortest generator.12938475691111212789111910111212345678987654365432112
11Development of Cylinder (3) Transfer each of the points from the generators on the End Elevation onto the correct generators on the Development.129876543Indicate each of the points with a small dot.987654321
12Development of Cylinder (4) Draw a smooth curve through each of the points found on the Development.129876543Darken the outlines of the rest of the Development911112123456789
13True Shape of cut (1)910111218765To draw the True Shape each of the points need to be projected away from the cut on the Elevation at right angles.243912876543Draw a datum line to show where the True Shape will be positioned – in this case the centre line has been used.918726543987654321Number each of the points for the True Shape.
14True Shape of cut (2)918726543Measure the distance on the Plan from the centre line to each of the points of the cut surface.Transfer each of these points onto the True Shape.Mark each of the points found with a small dot.121111293847569876543219111121236789111876545431122
15True Shape of cut (3)918726543To finish the True Shape draw a smooth curve through each of the points found.12111This is the final drawing.1293847569876543219111121236789111876545432112