1. Chapter 6 – Pictorial Sketching
Circles and Arcs
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2. Circles in Isometric
Circles appear as ellipses when drawn in an isometric sketch.
Video clip here

3. Frontal Plane
Orthographic
Frontal Plane

4. Profile Plane
Orthographic
Profile Plane

5. Horizontal Plane
Orthographic
Horizontal Plane

6. Notice Direction of Ellipses
Dependent on Sketch Plane
Horizontal Plane

7. Notice Direction of Ellipses
Dependent on Sketch Plane
Frontal Plane

8. Notice Direction of Ellipses
Dependent on Sketch Plane
Profile Plane

9. Notice Direction of Ellipses
Dependent on Sketch Plane

10. Steps to Sketching Ellipse on Frontal Plane
Step 1: Select appropriate plane
Location Height
Location
Width
Radius
Step 2: Locate center of circle
Center lines must be parallel to Frontal plane axis lines.
Lines must be sketched parallel to appropriate axis lines
Frontal plane
Isometric Axis
Step 3:
Determine radius
Center point of arc
Step 4: Sketch arcs
Tangent
Step 5: Sketch arcs
Finished frontal plane ellipse
Step 6: Darken
Center point of arc
Tangent

11. Steps to Sketching Ellipse on Frontal Plane
Isometric Axis
Step 1: Select appropriate plane
Frontal plane

12. Backside Locate center Box in depth Add tangent lines and darken
Sketch ellipse

13. Sketch the Following Soup Cans
Show ALL construction lines lightly
Cylinders Ø1 X 2
Thru hole Ø.25
1 Grid = 1/4”

14. Thin Object Determine appropriate plane Locate center of hole
Determine radius
Create ellipse

15. Thin Object - Backside Box radius Determine depth Sketch ellipse
Locate center lines
Darken object lines
Sketch ellipse
Sketch entire ellipse?

16. Arcs in Isometric Sketches
Arcs are usually sketched by locating their centers and then boxing in the enclosing parallelogram. Sketch the arc tangent to the enclosing box, which is drawn along isometric lines.

17. Arc Determine appropriate plane Locate center of arc Determine radius
Create ellipse

18. Arc – Bottom Side Determine depth Locate center lines and box radius
Sketch ellipse
Add tangent line
Sketch entire ellipse?
Darken