ISOMETRIC CIRCLES AND CYLINDERS Drawing a basic isometric

ISOMETRIC CIRCLES AND CYLINDERS Drawing a basic isometric shape such as cube can be difficult the first time you attempt to draw it using a T-Square and 30 degree Set Square. However, after a few attempts the technique for drawing them can be mastered quite easily. On the other hand - isometric circles and cylinders are more difficult and drawing them requires practice. Your work sheet should look like this: -

ISOMETRIC CIRCLES AND CYLINDERS 1. Draw the original circle of radius 40 mm with a pair of compasses and enclose it in a box. Add vertical and horizontal guidelines 40 mm 2. Number the vertical lines 10 mm apart (these are called 'ordinate lines') as shown on the diagram opposite. 10 mm Your work sheet should look like this: -

ISOMETRIC CIRCLES AND CYLINDERS 3. Draw the grid in isometric using a 30 degree set square, being careful to use the same measurements as the original grid which surrounds the circle. 4. To draw the circle in isometric projection simply measure each distance down each vertical line on the normal grid and transfer it to the isometric grid. On the diagrams opposite - distance 'x' on guideline 3 has been transferred to the isometric grid. This is repeated for each of the guidelines 1, 2, and 4. Your work sheet should look like this: -

ISOMETRIC CIRCLES AND CYLINDERS 5. Continue around the isometric circle 'plotting' transferring distances from the original grid to the isometric grid - until the circle is complete. Your work sheet should look like this: -

ISOMETRIC CIRCLES AND CYLINDERS CREATING A CYLINDER 6. Having successfully drawn the isometric circle developing it further to change it into a cylinder is relatively easy. Draw 30 degree guidelines out from the isometric circle with your set square as shown in the diagram 7. Measure the distance 30 mm representing the 'thickness' of the cylinder along each 30 degree guideline. Start drawing a curve through each of the points. Your work sheet should look like this: -

ISOMETRIC CIRCLES AND CYLINDERS 8. Draw the curve through each of the points to produce the final cylinder shade. Your work sheet should look like this: -

ISOMETRIC CIRCLES AND CYLINDERS This view 160 Draw a block in isometric to theses given dimensions with a 100 mm hole through it. Side view Front view Your work sheet should look like this: -