Deck 19: Precision Sheet Metal Drafting

Question 1

How can phantom line be used to represent a flat pattern on a drawing?

Answer 1

The flat pattern reference is shown extended from the front view using phantom lines and is labeled for reference.

Question 2

Briefly discuss how the term precision sheet metal drafting is used in this chapter is different from the term associated with sheet metal parts used in construction applications.

Answer 2

The term precision sheet metal drafting is used in this chapter to refer to sheet metal parts that are designed and manufactured with tighter tolerances than are normally associated with sheet metal parts used in construction applications such as the heating, ventilating, and air-conditioning (HVAC) industry discussed in Chapter 23 of this textbook.

Question 3

Define bend allowance.

Answer 3

Bend allowance is the amount of extra material needed for a bend to compensate for the compression during the bending process.

Question 4

Define the bend tangent line and describe how it is drawn. ChaPTer 19 PreCision sheeT

Question 5

Describe how plate material is different from sheet metal.

Question 6

Describe sheet metal parts.

Question 7

Describe bend transition.

Question 8

What are bend facets and when are they used?

Question 9

Define the K-factor.

Question 10

Define neutral axis.

Question 11

Describe the following precision sheet metal applications: tables, the use of a hole table, bend table, and a drawing showing a flat pattern with manufacturing information ex- tracted to a table.

Question 12

What specific material does the term sheet metal represent?

Question 13

Give an example of bend instructions that mean bend up 908 with a .120 bend radius.

Question 14

What is the purpose of a bend allowance calculation?

Question 15

Define flat pattern.

Question 16

Typically, where is the neutral axis?

Question 17

Describe how the inside mold line is drawn.

Question 18

Describe a drawing showing only the flat pattern using rect- angular coordinate dimensioning without dimension lines and tabular feature.

Question 19

Define the centerline of bend and describe how it is drawn. MeTal DrafTing ProbleMs

Question 20

Describe how the outside mold line is drawn.

Question 21

Name the three dimensioning practices that are commonly used for precision sheet metal drafting applications.

Question 22

Describe undimensioned drawings.

Question 23

Give the basic function of grid lines.

Question 24

Give the purpose of bend relief.

Question 25

Describe the characteristics of a typical miter joint.

Question 26

Describe nesting blanks.

Question 27

Define seam.

Question 28

What is a roll form?

Question 29

Define hem.

Question 30

How many registration marks are used and what is their orientation?

Question 31

Show the media note that should be placed on all undimen- sioned drawings.

Question 32

When are hems necessary?

Question 33

How are registration marks used in the place of grid lines?

Question 34

How is corner relief used?

Question 35

Define lancing.

Question 36

What is a stamping press?

Question 37

When is a roll form used?

Question 38

Define blanking.

Question 39

Define flange.

Question 40

Describe dimensional accuracy points.