Chapter 6 – Pictorial Sketching Circles and Arcs Print handouts Select File, Print Edit the following selections to read: Select the OK button

Circles in Isometric Circles appear as ellipses when drawn in an isometric sketch. Video clip here

Frontal Plane Orthographic Frontal Plane

Profile Plane Orthographic Profile Plane

Horizontal Plane Orthographic Horizontal Plane

Notice Direction of Ellipses Dependent on Sketch Plane Horizontal Plane

Notice Direction of Ellipses Dependent on Sketch Plane Frontal Plane

Notice Direction of Ellipses Dependent on Sketch Plane Profile Plane

Notice Direction of Ellipses Dependent on Sketch Plane

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

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

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

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

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

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

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.

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

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