Machine Tool Operations

Understanding Drawings

Objectives:

2.1. Understand the meaning of the various lines used in engineering drawings.

2.2. Recognize the various symbols used to convey information.

2.3. Read and understand engineering drawings and prints

Procedure:

1) Carefully study the chapter, and then answer the following questions in the space provided.

Questions:

1) Drawings are used by industry to _______________________.

a) Show what an object looks like in multiview

b) Show the craftworker what to make

c) Show the craftworker which standards to follow

d) All of the above

e) None of the above

2) Drawings using ________________ dimensioning usually show objects that do not require a high degree of precision in their manufacturer.

3) Dual dimensioning is a system that employees ____________ and _____________ dimensioning on the same drawing.

4) List at least four types of information (besides dimensioning), that is included on a drawing.

a) __________________________________________________________________

b) __________________________________________________________________

c) __________________________________________________________________

d) __________________________________________________________________

5) Define tolerance: ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

6) Dimensioning should be scaled off a drawing.

a) When there is not enough room on the drawing

b) When using a Diazo process

c) When doing revisions

d) Dimensioning should never be scaled off the drawing.

7) A sub assembly drawing differs from an assembly drawing by showing ___________ of complete object or project.

a) Several small portions

b) Only a small portion

c) Only the front and back portions

d) None of the above

8) Prints are used in place of their original drawings because _______________________________________________________________________________________________________________________________________________________________________________________________________________

9) Standard sized drawings have been developed to ____________

a) Simplify the storage of drawings

b) Make prints easier to handle

c) Make prints easier to stock

d) All of the above

e) None of the above

10) Prepare a parts list and Bill of Materials for the object shown in the figure below.

PARTS LIST
No.	Part	Quantity

BILL OF MATERIALS
Part No.	Part Name	Material	Size	Quantity

11) Identify the parts indicated in the following drawing.

a) __________________________________________________________

b) __________________________________________________________

c) __________________________________________________________

d) __________________________________________________________

e) __________________________________________________________

f) __________________________________________________________

g) __________________________________________________________

h) __________________________________________________________

12) Answer the following with the information from the drawing above.

a) Height of Part: _____________________________________

b) Width of Part: _____________________________________

c) Thickness of Part: _____________________________________

d) Diameter of large hole: _____________________________________

e) Tolerance of large hole: _____________________________________

f) Diameter of small holes: _____________________________________

g) Counterbore depth on small holes: _____________________________________

h) Diameter of Counterbore: _____________________________________

i) Special Notes: _____________________________________

_____________________________________

_____________________________________

Carefully study the drawing shown below. Using information from the drawing to answer questions 13 – 18.

13) List the answer for the following.

a) Part Name: ___________________________________________________

b) Drawing scale: ________________________________________________

c) Drawing number: ______________________________________________

d) Next assembly: _______________________________________________

e) Type of dimensioning used: _____________________________________

f) Material specified: ______________________________________________

g) Number of drawings making up the assembly: ________________________

h) What revisions were made: _______________________________________

______________________________________________________________

14) Minimum size material needed to make the part. Do not add to dimensioning for machining.

a) Length: ______________________________________________________

b) Width: ______________________________________________________

c) Thickness: ______________________________________________________

15) Special Notes:

a) 1) _____________________________________________________________

b) 2) _____________________________________________________________

c) 3) _____________________________________________________________

16) Hole Diameters

a) Large Hole: _____________________________________________________

b) Small Hole: _____________________________________________________

17) No metric dimensioning is given for machining the small hole. Why not? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

18) List the answer for the following.

a) Distance between hole centerlines: _____________________________________

b) Thread Size: _______________________________________________________

c) Why isn’t metric thread size given: _____________________________________

d) Thread Depth: _____________________________________________________

e) Thread clearance drill size: ___________________________________________

f) Width of slot: ______________________________________________________

g) Thickness of part: ___________________________________________________

h) Tolerance allowed on small hole: ______________________________________

i) Radius of part at small end: ___________________________________________

j) Radius of part at large end: ___________________________________________

k) How far is the flat on top of part located above horizontal line: _______________