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Dimension and

Extension LinesObject Lines (Thick)

Guide Lines

(Light and Thin)

DRAWN BY:

Object Line (Thick)

Hidden Line (medium)

Alphabet of Lines

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Hidden Line (medium)

ISOMETRIC CAVALIER

CABINET

PERSPECTIVE

PICTORIAL DRAWING

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PRODUCTION OF WORKING DRAWINGS

I. VIEW SELECTION

A. Top D. Left Side

B. Front E. RearC. Right Side F. Bottom

1. Materials 1/8" or less require only one view

2. Cylinders, Cones, Spheres require two views3. All other objects require at least three views

II. ADDITIONAL VIEW SELECTION

A. Primary Auxiliary ViewsB. Secondary Auxiliary Views

1. Views not considered one of the primary six views

2. Angular cut surfaces on objects require a primary auxiliary view

3. Compound angles (cut in two angles) require a secondary auxiliary

III. SECTIONAL VIEW SELECTION

A. Full D. RevolvedB. Half or Quarter E. RemovedC. Broken Out F. Offset

1. Used to clarify confusing hidden lines2. Shows internal parts of objects by turning hidden lines (that have been cut) into

view lines

3. One view will show the cutting plane line (where object is cut)4. One view is shown normally

5.

One view shows how the object looks after cutting (interior materials is sectioned)(Section l lines represent type of interior materials)

6. Full means to cut object totally in half

lf i ll d d bj hi h h l i h

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IV. DEVELOPMENT OR INTERSECTION SELECTION

A. Parallel LineB. Radial Line

1.

A layout is a flat sheet of material to be folded up to create a 3-dimensional object2. Objects that have 90-degree corners require parallel line developments3.

Objects that are cones, pyramids, or other geometrical shaped objects are

developed from a point in a circular pattern

V. DIMENSIONING SYSTEM SELECTION

A. Unidirectional

B. AlignedC. Arrowhead style

1. In unidirectional system all numbers read from the bottom of the paper (written in

a normal position)

2. In aligned system numbers are read from the bottom and right side of the drawing(numbers are written perpendicular to dimension lines)

3. Aligned system used on extremely large drawings4. Arrowhead styles include open arrowhead, closed arrowheads, dots, and diagonal

lines (slanting to the right) or no arrowhead at all

VI. SELECTION OF PICTORIAL REPRESENTATION

A. Isometric

B. Oblique

C. Perspective1. Isometric - Sides drawn at 30 degrees to right and left of vertical

2.

Oblique - Sides drawn at 45 degrees to right of front view3. Cavalier - All measurements in full scale

4. Cabinet - All measurements in full scale except width which is in half scale

i i hi i h h i li

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HOW TO MAKE A THREE VIEW MECHANICAL

DRAWING

You have learned to draw the FRONT, TOP and RIGHT SIDE VIEWS of an object. To make aThree view Mechanical Drawing you must learn how to place these views on your paper incorrect relation to each other. To help you understand how to do this , the Orthographic

Projection Paper shown in Figure 1 is used.

How to Use Orthographic Projection

Paper

1. Draw theFront View of the object

pictured in Figure 2 in theFrontViewarea of the paper (See A in

Figure 1) . Note the heavy corner

shown in the front of the picturedobject is the same corner as the

heavy corner on the paper.

2. Draw the Top View of the object

pictured in figure 2 in the Top Viewarea of the paper (See B in Figure

1) . Note the heavy corner shownin the top of the pictured object is the

same corner as the heavy

corner on the paper.

3.

Draw theRight SideView of the

object pictured in figure 2 in the

Right SideView area of the paper( i i ) h hi

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STUDENT'S NAME PROBLEM NAME PROBLEM NUMBER GRADE

0"

1"

2"

0"

1"

2"

3"

0" 1" 2" 3" 4" 5" 6"

LENGTH WIDTH

HEIGHT

WIDTH

TOP VIEW

FRONT VIEW RIGHT SIDE VIEW

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A

1 MAKE A FREEHANDSKETCH ON ENLARGEDGRID, STARTING AT "A"

MAKE A FREEHANDSKETCH ON ENLARGED

2

TECHNICAL SKETCHING

A

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6"

2"

3"

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6"

2"

3"

1"

1"

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3"

1"

1"

1"

3"

3"

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6"

2"

3"

1"

1"

1"

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Ima Student

11-29-99 1=1

Sample Title Block 00

PROBLEM NO. 6 NAME -NOTCHED BLOCK

2

3

5

1 12

112

6

114

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PROBLEM NO. 7 NAME -ANGLE BRACKET

12

3 11

121

5

1

41

2

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PROBLEM NO. 8 MORTISE BLOCK

3

6

2

1

1

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PROBLEM NO. 9 SUPPORT

3

6

2

1

1

2 HOLES 1 1/ 2 D

2

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Basic Rules for Dimensioning

1. Place the dimensions between views where possible.

2. Place the dimension line for the shortest lengthnearest the outline of the object. Parallel

dimension lines are placed in order of their size,

making the longest dimension line the outermost.

3. Place the dimensions on the view that mostcompletely shows the characteristic contour of the

object. Note that in figure (C) this practice cannot becompletely followed. The width dimensions must go

below the rightside view, where that part of the shape is

shown best.

4. Place dimensions in line where space permits.

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11

8 1/2

STEP 1 - Draw a sketch of the object and figure material needed.

2

3

6 3

1

1+ +=

+

6

10

11-10=1 1 divided by2 = 1/2

8-1/2-6=2-1/2 2-1/2 divided by 2 = 1-1/4

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STEP 2 - Draw a light line 1/2 inch from the left

11

8 1/2

1/2

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STEP 3 - Draw a light line 6 inches from the 1/2 inch line

11

8 1/2

1/2 6

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STEP 5 - Draw a light line 3 inches from the 1 inch line

11

8 1/2

1/2 6 1 3

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STEP 6 - Draw a light line 1-14 inches from the bottom edge

11

8 1/2

1/2 6 1

1 1/4

3

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STEP 7 - Draw a light line 2 inches from the 1-1/4 line

11

8 1/2

1/2 6 1

1 1/4

2

3

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STEP 8 - Draw a light line 1 inch from the 2 inch line

11

8 1/2

1/2 6 1

1 1/4

2

1

3

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STEP 9 - Draw a light line 3 inches from the 1 inch line

11

8 1/2

1/2 6 1

1 1/4

2

1

3

3

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STEP 10 - Draw the front view

11

8 1/2

1/2 6 1

1 1/4

2

1

3

3

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STEP 11 - Draw the top view

11

8 1/2

1/2 6 1

1 1/4

2

1

3

3

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STEP 12 - Draw the right view

11

8 1/2

1/2 6 1

1 1/4

2

1

3

3

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STEP 13 - Place the proper dimensions in the correct places

11

8 1/2

1/2 6 1

1 1/4

2

1

3

3

6

2

33

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STEP 14 - Place your name and title in the proper place

11

8 1/2

1/2 6 1

1 1/4

2

1

3

3

6

2

33

YOUR NAME

TITLE

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3

6

2

3

Ima Student

Wedge

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3

6

2

3

30 points5 points per view = 15

5 points for dimensions5 points for centering5 points for name and title

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1

QUIZ SKETCHING

Properly sketch the three views of the object below on theGRAPH PAPER provided.

6

1/ 2

2 1/2

1 1/2

2

1

13

4

4

1

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3

2

6

QUIZ SKETCHING

Properly draw the three views of the object below on PLAIN PAPER.DRAW THE VIEWS FULL SIZE

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25 points5 points per view = 155 points for centering5 points for name and title

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3

6

2

3

QUIZ SKETCHING # 2

NAME