1Chapter 12

Chapter 12Surface Texture Symbols

2Learning Objectives

L Explain common terms related to surface quality and surfacetexture symbols.

L Identify and interpret the components of surface texturesymbols.

L Identify lay symbols used in surface texture symbols.L Describe the units used by various values within surface texture

symbols.

Learning Objectives

3Learning Objectives

L Explain standard practices for applying surface texturesymbols on a print.

L Identify special designations related to surface qualitythat may appear on a print.

Learning Objectives

4Surface Texture Terms

L Surface texture is the overall roughness, waviness, lay,or flaws of a surface

Surface Texture Terms

5Surface Texture Terms

L Roughness height examples

Surface Texture Terms

6Surface Texture Symbols

L In the past, finished surfaces were identified with finishmarks, as shown here

L Surface texture symbols are now used instead

Surface Texture Symbols

7Surface Texture Symbol

L A—Basic surface texture symbolL B—Material removal is required by machiningL C—Indicates a minimum amount that must be removedL D—Material removal is prohibitedL E—Horizontal bar to help locate parameters and values

Surface Texture Symbol

8Surface Texture Values

L (a) Average roughness value (microinches or micrometers)L (b) Optional production method (such as GRIND)L (c) Roughness cutoff or sampling lengthL (d) Optional lay symbolL (e) Minimum material removal (inches or millimeters)L (f) Roughness parameter other than arithmetic average

Surface Texture Values

9Lay Symbols

L Lay symbols are not required

L Seven options

Lay Symbols

10Applying Surface Texture Symbols

L Surface texture symbols can be attached to:T Surface “edge views”T Extension linesT Leader line shouldersT Placed in a note

Applying Surface Texture Symbols

11What do you see?

What do you see?

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13Chapter 22

Chapter 22Welding Prints

14Learning Objectives

L Identify a welding symbol.L List the elements of a welding symbol.L Explain the meaning of a welding symbol.L Identify the basic weld symbols used in welding symbols.L Discuss other welding applications.

Learning Objectives

15Welding Prints

L Welding prints combine elements of detail and assemblydrawings within one print

Welding Prints

16Welding Defined

L Welding O Method of joining metal pieces by melting them along a joint

L Weld: O The junction or joint where welded parts are joined

Welding Defined

17Welding Symbol

Welding Symbol

18Weld Symbol

L The weld symbol attaches to the reference line of the weldingsymbol

Weld Symbol

19Weld Location

L Weld location is indicated by the relation of the weld symbol tothe reference line

Weld Location

20Weld Dimensions

L Dimensions of a weld can be specified above or below thereference line or in a general note

Weld Dimensions

21Groove Welds

L Groove weld specificationsT (A) Groove angleT (B) Root opening

Groove Welds

22Spot Weld Examples

L The spot weld symbol can be annotated in many waysT (A) Diameter specifiedT (B) Strength specifiedT (C) Spacing specified

(weld through also)T (D) Quantity specified

Spot Weld Examples

23Supplementary Symbols

L Contour symbolT (A) Flat facedT (B) ConvexT (C) Convex

Supplementary Symbols

24Supplementary Symbols

L Weld all aroundL Field weldL Melt throughT (A) Melt through plus reinforcementT (B) Melt through and finished by machining

Supplementary Symbols

25Other Applications

L Slot weldL Plug weldL Back or backing weldL Surfacing weld symbol

Other Applications

26Other Applications

L Finish symbols indicate the method of finishing, not the surfacetexture

T C = chippingT G = grindingT M = machiningT R = rollingT H = hammering

Other Applications

27What do you see?

What do you see?

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