Blueprint Reading for the Machine Trades, Sixth Edition Unit 4: Reading Multiview Drawings

Blueprint Reading for the Machine Trades, Sixth

Edition Unit 4: Reading Multiview

Drawings

Russ Schultz and Larry Smith

PowerPoint presentation created by LaVonne Vichlach

Schultz and Smith: Blueprint Reading for the Machine Trades, 6th edition

Reading the Drawings Sufficient number of dimensions on

a print to enable you to produce the drawing

Each dimension appears only once Drafter may place dimension on

different view than expected

Reading the Drawings Need to be proficient at reading

multiview drawings May need to calculate dimensions

not provided from surrounding information

CalculateA

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Which of the three basic dimensions are shown in the front view-height, width, or depth?

Height

Basic Dimension Quiz

Which of the three basic dimensions are shown in the top view-height, width, or depth?

Height

Which of the three basic dimensions are shown in the right-side view-height, width, or depth?

Which of the three basic dimensions are shown in the bottom view-height, width, or depth?

Height

Which of the three basic dimensions are shown in the left-side view-height, width, or depth?

Height

Which of the three basic dimensions are shown in the rear view-height, width, or depth?

1. Height dimension?

Dimension Calculations 1

2. Width dimension?

3. Depth dimension?

Calculate

Precedence of LinesWhen visible lines, hidden lines, or centerlines coincide in same view-a preferred line is illustrated.

Visible line over hidden line

Visible line over centerline

Hidden line over centerline

Precedence of Lines

1. What is the name of the object?

Adj Holding Block

ADJ Holding Block

2. Of what material is the object made? (Do not abbreviate.)

Hot-rolled steel

ADJ Holding Block

3. To what scale (half, full, double) is the object drawn?

ADJ Holding Block

4. What system of dimensioning (fractional, decimal, metric) is used?

Metric

ADJ Holding Block

5. What decimal increments (inches, centimeters, millimeters) are used?

Millimeter

ADJ Holding Block

6. What angle of projection (first, second, third) is used?

ADJ Holding Block

7. What tolerance is assigned to each dimension?

0.5 MM

ADJ Holding Block

8. What is the height dimension?

ADJ Holding Block

9. What is the width dimension?

ADJ Holding Block

10. What is the depth dimension at maximum material condition?

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter A.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter B.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter C.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter D.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter E.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter F.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter G.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter H.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter I.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter J.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter K.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter L.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter M.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter N.

ADJ Holding Block

Enter the dimensions from the drawing 11A011 for the letter O.

ADJ Holding Block

1. Height dimension?

Dimension Calculations

2. Depth dimension?

2Calculate

Drawings are dimensioned to control tolerance of important features

Double dimensioning is avoided Machinist needs to calculate dimensions Calculated dimension will accumulate

tolerance of every dimension used---true of addition and subtraction

Accumulated Tolerances

Three different methods of dimensioning same shaft

Tolerances on step may vary depending on dimensioning method

Dimensioning Methods

Includes length of each step Individual tolerance for each

step is controlled Does not include overall length Each step has a tolerance Overall length accumulates

tolerance of each step

Chain Dimensioning

Includes overall length and all but one step length

Tolerance on overall length All but least important step is controlled Undimensioned length accumulates

tolerance of all dimensions used to calculate it.

Broken-Chain Dimensioning

Each step length is measured from a common surface or baseline

Accumulation is limited to not more than two tolerances

Datum Dimensioning

5-Step Shaft

Enter the appropriate letters (A thru D) into the corresponding numbered balloons shown.

5-Step Shaft

What is the tolerance on the overall length?

5-Step Shaft

What is the tolerance on the length of step B?

5-Step Shaft

1. Is (a) first-angle or (b) third-angle projection used?

(b) third-angle

6-Step Shaft

2. Is the circular view (a) a top or (b) a bottom view?

(a) Top view

6-Step Shaft

3. Is the part (a) concentric or (b) eccentric?

(b) concentric

6-Step Shaft

(a) symmetrical

4. Is the part (a) symmetrical or (b)

nonsymmetrical?

6-Step Shaft

5. What is the print tolerance for each dimension shown?

6-Step Shaft

6. What is the overall length of the shaft?

6-Step Shaft

7. What is the MMC of shoulder E OD?

6-Step Shaft

8. What is the MMC of the bore ID?

6-Step Shaft

9. What is the tolerance on the length of shoulder A ?

6-Step Shaft

10. What is the tolerance on the length of shoulder D ?

6-Step Shaft

11. Why are the answers to questions 9 and 10 different?

A requires two dimensions to solve

–two tolerances accumulate

6-Step Shaft

12. Why is there no hidden line representing the 1.50 bore diameter in the circular view?

Precedence of lines rule-corresponds to

1.50 step

6-Step Shaft

Enter the appropriate letters G, H, I J, L, and M into corresponding balloons.

Enter the appropriate letters N and L into corresponding balloons.

Surface Identification 3

Enter the letters from the front view into the corresponding balloons in the top view. Near-closets to viewer’s eye.Far-blocked from view by near surfaces.

All tolerances are assigned a tolerance of .01. This example is the broken-chain method-tolerances accumulate.

A and B

A and C

A and E

B and F

C and F

B and G

C and G

E and G

F and G

.06Maximum tolerance accumulation = .06

Surface Identification 3

Tolerance Calculations

All tolerances are assigned a tolerance of .01. This example is the datum method controls tolerance accumulation.

A and B

A and C

A and E

B and F

C and F

B and G

C and G

E and G

F and G

.02Maximum tolerance accumulation = .02

Tolerance Calculations 2

Calculate reference dimensions and their accumulated tolerances. Tolerances always add. Phantom lines represent the limits.)

40 +4/-0

20 + 4/-0

Calculate reference dimensions and their accumulated tolerances. Tolerances always add. (Phantom lines represent the limits.)

Determine the hole diameter that corresponds with each encircled letter shown on the orthographic views.

Hole Identification 1

Determine the dimensions that correspond to the encircled letters shown to the right.

Height

View Selection 3

Select correct orthographic view to correspond with the arrowhead for each pictorial view.

View Selection 3

JView Selection 3Select correct orthographic view to correspond with the arrowhead for each pictorial view.

View Selection 3

View Selection 3Select correct orthographic view to correspond with the arrowhead for each pictorial view.

View Selection 3

DView Selection 3Select correct orthographic view to correspond with the arrowhead for each pictorial view.

View Selection 3

View Selection 3Select correct orthographic view to correspond with the arrowhead for each pictorial view.

Determine the corresponding dimensions for the following.

Height dimension

Width dimension

Corner BRKT

1. What does BRKT in the title block abbreviate?

Bracket

2. What does HRS in the material block abbreviate?

Hot-rolled steel

Corner BRKT

3. What does NTS in the scale block abbreviate?

Not to scale

Corner BRKT

4. What is the overall depth dimension?

Corner BRKT

5. What is the MMC of the overall height?

Corner BRKT

6. What is the MMC of the .360 hole?

Corner BRKT

7. How much tolerance can accumulate between the .380 hole centers?

Corner BRKT

8. What is the overall size of the CORNER BRACKET?

2.22 x 2.24 x 2.18

Corner BRKT

Calculate the value for A:

Corner BRKT

Calculate the value for B:

Corner BRKT

Calculate the value for C:

Corner BRKT

Calculate the value for D:

Corner BRKT

Calculate the value for E:

Corner BRKT

Calculate the value for F:

Corner BRKT

Calculate the value for G:

Corner BRKT

Calculate the value for H:

Corner BRKT

Calculate the value for I:

Corner BRKT

Calculate the value for J:

Corner BRKT

Calculate the value for K:

Corner BRKT

Calculate the value for L:

Corner BRKT

Calculate the value for M:

Corner BRKT

View Selection 4

Select the correct right side view.

View Selection 4

Missing Views 2

Complete the view.

Missing Views 2

Complete the view.

Missing Views 2

Complete the view.

Missing Views 2

Complete the view.

Blueprint Reading for the Machine Trades, Sixth Edition Unit 4: Reading Multiview Drawings

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