solid cylinder cut at an angle drawing abilities teacher © j lewis 2004

Solid Cylinder cut at an angle

Drawing Abilities Teacher

© J Lewis 2004

Orthographic projection

Plan

Elevation

Draw the Plan and Elevation of the cylinder, which is cut at an angle of 30 °

© J Lewis 2004

Drawing generators

Divide the plan into 12 equal generators at 30 °, number these as shown

© J Lewis 2004

Plan

Elevation

Inserting reference points

Project the vertical generators down to the Elevation and number as shown

© J Lewis 2004

Elevation

Starting the End Elevation

Construct the outline of the End Elevation, point 3 at the front and the generators shown

© J Lewis 2004

Elevation End Elevation

Drawing horizontal generators

Construct horizontals where the vertical generators cross the sloping top of the Elevation

© J Lewis 2004

Elevation End Elevation

Marking out the shapeNow mark the End Elevation. Points are found where horizontal lines cross similar marked generators.

© J Lewis 2004

Elevation End Elevation

Drawing the ellipse

Draw an ellipse passing through the marked points

36

(12)(10)(11)789 6

(2)(1)45 3

(11)12

(8)4

(7)6 5

(9)(10)3 2 1

© J Lewis 2004

Elevation End Elevation

Finished End Elevation

© J Lewis 2004

Surface Development

Project horizontals from the Elevation and step off to circumference length in 12 steps

© J Lewis 2004Elevation

Marking points

Mark the reference points carefully as shown below

© J Lewis 2004

Elevation

Joining the points

Join the points with a smooth curve

© J Lewis 2004

Elevation

Finished Surface Development

© J Lewis 2004

Plan

Elevation Surface Development

Dealing with ConesCones are dealt with in a similar way to cylinders

The Plan and Elevation of the cone, which is cut at an angle of 30 ° by the plane A – A are shown below

© J Lewis 2004

Drawing generators

Divide the Plan into 12 equal generators at 30 °, number these as shown

© J Lewis 2004

Inserting reference pointsProject the vertical generators down to the Elevation and number as shown

© J Lewis 2004

Drawing Surface GeneratorsDraw surface generators as shown

© J Lewis 2004

Starting the End ElevationConstruct the outline of the End Elevation, point 3 at the front and the generators shown

© J Lewis 2004

Elevation End Elevation

Starting the End ElevationConstruct surface generators on the End Elevation as shown

© J Lewis 2004

Elevation End Elevation

Drawing the End ElevationConstruct horizontals as shown

© J Lewis 2004

Elevation End Elevation

Drawing the End ElevationDraw a smooth curve as shown on the End Elevation

© J Lewis 2004

End Elevation

Starting the PlanConstruct the lines shown from the Elevation up to the Plan

© J Lewis 2004

Elevation

Plan

Completing the PlanTransfer the measurement on 6 – 12 on the End Elevation to the same generator on the Plan and draw a smooth curve as shown.

© J Lewis 2004

Elevation

Plan

End Elevation

Finished Orthographic Projection

© J Lewis 2004

Surface DevelopmentStep off to circumference length in 12 steps along an arc with the same radius as generator 3 as shown – this is a true length of side

Mark off the true lengths of each of the generators as shown and draw the surface development

© J Lewis 2004

Elevation