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