# Sketching Practice Sketching Practice Gateway To Technology®

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Sketching Practice Sketching Practice Gateway To Technology®
Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Sketching Practice

“One picture is worth a thousand words.”
Sketching “One picture is worth a thousand words.”

Purpose The main purpose of sketching is to convey ideas.
Engineers have to use sketches to brainstorm ideas, as well as, to show others what they are working on or what should be designed. Sketches are also used to document measurements from the field before they are produced as solid models on the computer.

Sketches used in Engineering
Pictorial – shows object in 3D form Isometric Orthographic – shows object in 2D form Multiview Perspective

Pictorial Sketches Show shape of object Show height, width, and depth
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Pictorial Sketches Show shape of object Show height, width, and depth Common types: Isometric Perspective Pictorial drawings show the shape of an object viewed by the human eye. Pictorial sketches are sketches that show height, width, and depth all in one view. Common types of pictorial drawings are isometric and perspective.

Thumbnail Sketches A quick way of getting an idea onto a sheet of paper Usually small but made in proportion Sketch with a light touch on the pencil; darken when in final stages.

Irregular Shapes Size: Length, width, height, distance. How big is the object you are sketching? Proportion: If two objects are five feet apart in real life, then those two objects must appear to be five feet apart in your sketch. TWO TYPES Irregular Shape – Block Method Irregular Shape – Frame of Reference

Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Perspective Perspective is a way to draw that shows a view of the object in the most realistic way. Vanishing points are used to guide the lines in the object to the horizon line or the horizontal line you see at your line of sight.

One-Point Perspective
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques One-Point Perspective This is an example of one point perspective. Notice that all lines in the depth project to one point, the vanishing point. The location of the vanishing point is based on your line of sight.

One-Point Perspective
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques One-Point Perspective Vanishing Point (VP) All lines in the depth project to one point (the vanishing point). The location of the vanishing point is based on your line of sight. Copy this one-point perspective sketch onto your activity. Label the front, top, and right side. This is an example of one point perspective. Notice that all lines in the depth project to one point, the vanishing point. The location of the vanishing point is based on your line of sight.

One-Point Perspective
All lines in the depth project to one point (vanishing point). The location of the vanishing point is based on your line of sight. Copy this 1-point Perspective sketch on your drawing paper.

Two-Point Perspective
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Two-Point Perspective

Two-Point Perspective
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Two-Point Perspective VP1 VP2 In two-point perspective, the width lines converge on one vanishing point (VP1), and the depth lines converge on the other vanishing point (VP2). Copy this two-point perspective onto your activity sheet. Label the top, front, and side.

Two-Point Perspective
In two point perspective the depth lines converge on one vanishing point (VP2) and the width lines converge on the other vanishing point (VP1). Copy this two-point Perspective sketch on your drawing paper.

3D Sketching Techniques
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques 3D Sketching Techniques Isometric Grid Paper A technique you can use when making an isometric sketch is to use isometric grid paper. This helps with determining the right angle for your sketch. You can also create a more professional look to your sketch by turning the paper over and drawing the sketch on the white side of the sheet but still utilizing the grid. Your finished product will look cleaner if it is on the white side of the paper.

Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Isometric Sketch Width and depth lines are drawn at 30° from the horizon line. One view shows height, width, and depth.

Thumbnail Isometric Sketch
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Thumbnail Isometric Sketch Copy and label this cube on your isometric axis.

are drawn at 30 degrees from
Isometric Sketching Note: one view shows Height, width, and depth. Width and depth lines are drawn at 30 degrees from the horizon line. Copy and label this cube on your isometric axis

Isometric Sketching Copy this sketch onto your 2nd isometric axis.

Follow the directions in Activity 3
Follow the directions in Activity 3.1 The Language of Sketching Sketch Group 2 Thumbnail isometric sketching.

Isometric Thumbnail Sketch
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Isometric Thumbnail Sketch Additive and Subtractive 3D sketch Follow the steps in your activity to complete this drawing on the isometric graph paper. An isometric sketch shows an object in which the width and depth are projected at 30 degree angles from the horizontal axis. The height, width, and depth values are all at the same scale.

Orthographic (Multiview Drawings)
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Orthographic (Multiview Drawings) Pictorial sketches help engineers explain ideas and communicate to the customer what the final part will look like. Unfortunately, pictorial drawings have some disadvantages. Foreshortened views and distorted features do not allow for accurate prototyping. In order for parts to be accurately depicted, you typically need views that directly portray each surface. The arrows represent the line of sight associated with each view. Any object possesses six views. Notice the similarities between the front and back, the right and left, the top and bottom views.

Multiview Sketching The arrows represent the line of sight associated
with each view. Note how the views are oriented. Each view is adjacent to the other as if they were unfolded from a 3D shape.

Orthographic (Multiview) Sketching
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Orthographic (Multiview) Sketching An orthographic sketch is used to show true size and shape. Each view is adjacent to the other as if unfolded from a 3D shape. Notice the top view is directly above the front with the right side view directly to the right of the front. In order to obtain these straight line views, we have a type of drawing called orthographic projection, also known as multiview drawing. Orthographic projection is a way to project a view based on a line of sight that is perpendicular to that view.

Orthographic (Multiview) Sketching
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Orthographic (Multiview) Sketching Copy this orthographic sketch onto your activity sheet. Label the top, front, and right side. Don’t forget the hidden lines. Note the orientation of the views. Each view is adjacent to the other as if they were unfolded from a 3D shape. Front, top, and right side views are used most often.

Multiview Sketching Draw this object (Multiview).

Multiview Sketching Draw this object (Multiview).

Multiview Sketching Draw this object (Multiview).

Multiview Sketching Draw this object (Multiview).

Multiview Sketching Draw this object (Multiview).

Orthographic – View Selection
Sketching Practice Gateway To Technology® Unit 1 – Lesson 1.4 – Sketching and Dimensioning Techniques Orthographic – View Selection Characteristics for selecting the front view Best shape & details Longest dimensions Fewest hidden lines Most natural position Finding the best view of a part can be difficult. Two or more sides may seem to be the best choice for the front view. Consider these four main details when selecting the front view. First, which side shows the best shape or details of the object? Which side shows the longest dimensions of the object? Which side shows the fewest hidden lines? Which side shows the most natural position of how the object will be used? Which view do you think should be the front?

Multiview Sketching Copy the multiview sketch below on to