Deck 21: Dimensioning Tapers and Machined Surfaces

Question 1

Explain what the values in the ASME surface texture system specify.

Answer 1

The ASME surface texture system requires a series of measurement values to be used with the symbol. The values specify the degree of accuracy to which surface irregularities (roughness) are to be measured. The pattern of marks produced by machining (lay), the spacing of the irregularities (waviness), and scratches and other surface imperfections (flaws) are represented by still other symbols and measurement values.

Question 2

In the accompanying figure, provide a brief description of the process for the symbol identified as number 2.

Answer 2

The surface is to be produced by a nonmachining process such as casting, forging, welding, rolling, powder metallurgy, etc. There is to be no subsequent machining of the surface.

Question 3

When a casting, forging, or welded part is to be finished all over, the drawing is simplified by omitting the finish symbols and adding the note: ____.

A) ALL OVER
B) ALL OVER FINISH
C) FINISH
D) FINISH ALL OVER

Answer 3

D

Question 4

In the accompanying figure, provide a brief description of the process for the symbol identified as number 1.

Question 5

Surfaces that are machined to a smooth finish and to accurate dimensions are called ____ surfaces.

A) standardized
B) finished
C) designed
D) finalized

Question 6

On a round piece of work, the ____ is the difference between the diameter at one point and a diameter farther along the length.

A) radius
B) taper
C) angle
D) arc

Question 7

Describe the newest ASME standard for dimensioning conical (cone-shaped) tapered surfaces.

Question 8

As applied to drawings, ____ denotes repetitive or random deviations from a nominal (specified) surface.

A) surface detail
B) surface reference
C) surface texture
D) surface scale

Question 9

How are tapers usually specified on drawings where dimensions are given in inches?

Question 10

The accompanying figure illustrates ____ forging.

A) machined
B) stamped
C) drop
D) hot

Question 11

In the accompanying figure, provide a brief description of the process for the symbol identified as number 3.