Chapter Tests and Problems
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1 Chapter Tests and Problems Chapter 11 Fasteners and Springs Test INSTRUCTIONS Answer the questions with short, complete statements or drawings as needed. QUESTIONS Define the screw thread terms given in questions 1 through Axis 2. Classes of threads 3. Fit 4. Die 5. Major diameter 6. Minor diameter 7. Pitch 8. Tap 9. Tap drill 10. Thread 11. Threads per inch 12. Name and describe three types of taps. 13. Name the three methods of thread representation. 14. What thread representation is most commonly used and why? 15. Why is it common, when possible, to drill deeper than the intended depth of the tap? 16. Why should an internal tap be deeper than the fastener thread? 17. Identify the components of the following metric thread note. M g 18. Identify the components of the following unified screw thread note. 7/ UNF 2 2 B 19. When is the abbreviation LH used at the end of a thread note? 20. What assumption is made about the thread if LH is not placed at the end of the thread note? 21. Identify two functions of thread inserts. 22. What are set screws used for? 23. What type of information is required to completely identify a bolt or screw? 24. Identify two applications for taper pins. 25. Identify two applications for washers. 26. What are retaining rings used for? 27. What is the principal application for keys? 28. How are standard key sizes determined? 29. Define keyseat. 30. What are rivets used for, and how are they applied? 31. Standard thread forming tools generally have lead in chamfers that produce how many incomplete threads on the leading edge of the tool? 32. Define runout. 33. Give two problems that can occur when designing features that do not provide enough allowance for runout or sufficient room for the tool. 34. Define blind hole. 35. Give three reasons why through threaded holes are preferred over blind threaded holes from a manufacturing standpoint. 36. Taper taps generally have how many lead in chamfers? 37. Bottoming taps generally have how many lead in chamfers? 38. Plug taps generally have how many lead in chamfers? 39. Name the type of tap that is the most commonly used production tool for thread forming. 40. Give the minimum formula that you would use when determining pilot hole depth _ch11_EOC_ptg01.indd 1
2 41. According to ASME Y14.6, what is the general guideline for the dimension specified on a drawing for thread depth in a blind hole? 42. What does a thread chamfer or countersink in the pilot hole help prevent? 43. Give the specifi cations for a reasonable chamfer or countersink on the pilot hole. 44. Give the general rule that can be used when designing the minimum tool runout for external threads. 45. External threads should have a lead in chamfer for tooling. Give the general guideline for the applied chamfer diameter for this application. 46. If a relief is used on external threads, the applied relief diameter should not exceed what specification? 47. Identify the two optional provisions that must be used when designing a threaded joint with a shoulder. 48. List the three major functions of pipe threads. 49. Give the drawing angle that is recommended for representing a taper pipe thread. 50. Define self-clinching fastener. 51. Define spring and give the basic design principle. 52. Identify at least three design criteria used in spring design. 53. Describe spring index and explain what the spring index is a factor in determining. 54. Identify at least one design factor related to helix direction. 55. Define coil related to spring terminology, and identify active coils and total coils. 56. Describe deflection related to a compression spring and an extension spring. 57. What is helix direction, and how is helix direction specified? 58. Define spring pitch. 59. Give the basic function of a torsion spring. 60. Describe a flat spring and give at least one use for a flat spring. 61. Give another name for wave springs, and describe the advantage of using wave springs rather than coil springs. 62. Identify and name the national standard that provides detailed descriptions, drafting practices, and examples of most common springs used in manufacturing.. No matter which spring representation method is used, several important specifications must accompany the spring drawing. What is this information or specification called, and how is it placed on the drawing? List at least eight items that are included. 64. Briefly explain the application of phantom lines used when drawing a detailed thread representation. Phantom lines can be used to simplify the drafting of repeated detail. 65. Discuss why the schematic spring representation is not as commonly used as the detailed spring representation. Chapter 11 Fasteners and Springs ProblemS INSTRUCTIONS 1. From the selected problems, determine which views and dimensions should be used to completely detail the part. Use simplified representation for thread representations unless otherwise specified in the instructions or by your instructor. Use detailed representation for spring representations unless otherwise specified in the instructions or by your instructor. 2. Make a multiview sketch to proper proportions, including dimensions and notes. 3. Using the sketch as a guide, draw an original multiview drawing on an adequately sized ASME drawing sheet with border and sheet blocks. Add all necessary dimensions and notes using unidirectional dimensioning. 4. Include the following general notes at the lower left corner of the sheet.5 in. each way from the corner border lines: NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y REMOVE ALL BURRS AND SHARP EDGES. Additional general notes can be required, depending on the specifications of each individual assignment. Use the following tolerances for unspecified inch values. A tolerance block is recommended as described in Chapter 2, Drafting Equipment, Media, and Reproduction Methods, and as shown in problems for Chapter 10, Dimensioning and Tolerancing, unless otherwise specified. Unspecified Tolerances Decimals mm In. X 6.1 XX 6.01 XXX ANGULAR 09 FINISH 3.2 µm 125 µin. For metric drawings, provide a general note that states TOLER- ANCES FOR UNSPECIFIED DIMENSIONS COMPLY WITH ISO 2768-m. Provide a general note that states SURFACE FINISH 3.2 µm UNLESS OTHERWISE SPECIFIED _ch11_EOC_ptg01.indd 2
3 Drafting Templates To access CADD template files with predefined drafting settings, go to the Student Companion Website, select Student Downloads, Drafting Templates, and then the appropriate template file. Use the templates to create new designs, as a resource for drawing and model content, or for inspiration when developing your own templates. The ASME-Inch and ASME-Metric drafting templates follow ASME, ISO, and related mechanical drafting standards. Drawing templates include standard sheet sizes and formats, and a variety of appropriate drawing settings and content. You can also use a utility such as the AutoCAD DesignCenter to add content from the drawing templates to your own drawings and templates. Consult with your instructor to determine which template drawing and drawing content to use. Part 1: Problems 11.1 Through Problem 11.1 (in.) Part Name: Full Dog Point Gib Screw Material: UNF-2A.75 long.25 SR Problem 11.2 (in.) Part Name: Thumb Screw Material: SAE 1315 steel 2X 458 X UNF-2A R.032 Ø.437 Ø P KNURL.120 SIDE VIEW 59728_ch11_EOC_ptg01.indd 3
4 Problem 11.3 (in.) Part Name: H-Step Threading Screw Material: SAE 3130 SPECIFIC INSTRUCTIONS: Draw each of the three threads using the representation specified below each thread note. MEDIUM UNC-2A DIAMOND ( SHOW IN DETAIL KNURL Ø. 72 REPRESENTATION ) UNC-2A Ø. 51 ( SHOW IN SCHEMATIC ) Ø UNC-2A ( SHOW IN SIMPLIFIED ) Ø X X Problem 11.4 (metric) Part Name: Knurled Hex Soc Head Step Screw Material: SAE 1040 Case Harden: 1.6-mm deep per Rockwell C scale Finish: 2 µm; black oxide 0.8P DIAMOND KNURL NECK 3W X Ø4.06 R3.05 M20 X 6g 458 X 2.54 Problem 11.5 (in.) Part Name: Machine Screw Material: Stainless steel Finish All Over: 2 µm 6X Ø (6X 608) 458 X Ø UNF-3A 458 X X Ø HEX. SOCK. HD. 16 ACROSS FLATS Ø Ø _ch11_EOC_ptg01.indd 4
5 .781 Problem 11.6 (metric) Part Name: Lathe Dog Material: Cast iron Problem 11.9 (in.) Part Name: Shoulder Screw Material: SAE 4320 steel Ø50 2X R3 2X 458 X 1 R Ø /16-24 UNF-2A Ø X Ø7.94 M10 X 1.5-5H 15 R20 Ø.125 2X 458 X R.031 Problem 11.7 (in.) Part Name: Threaded Step Shaft Material: SAE 1030 Problem (in.) Part Name: Stop Screw Material: SAE 4320 Hex Depth:.175 Note: Medium diamond knurl at head Ø1.250 Ø.875 Ø.824 3X UNC UNC UNC 3X 308 Ø.605 Ø.384 3X A Ø.313 Ø Ø.625 3/8-24 UNF-2A 2X 458 X.0 MEDIUM DIAMOND KNURL Problem 11.8 (in.) Part Name: Washer Face Nut Material: SAE 1330 steel 5/16 HEX PART # 1DT DT-1012 CHART A LENGTH Ø.502 DRILL 9/16-18 UNF-2B BOTTOM VIEW 59728_ch11_EOC_ptg01.indd 5
6 Problem (metric) Part Name: Vise base Material: Cast iron Problem (metric) SPECIFIC INSTRUCTIONS: Create spring drawing based on the following specifications: Part Name: Compression Spring M12 X H 19 4X Ø 3 Ø Material: 2.5-mm steel spring wire Ends: Plain ground Outside Diameter: 25 Free Length: 75 Number of Coils: 16 Finish: Chrome plate X R DETA IL A DETA IL B 2X R0.6 (THRU BOTH SIDES) Problem (metric) Part Name: Flat Spring Material: 3.5-mm spring steel Finish: Black oxide Heat Treat: 1-mm deep Rockwell C scale A DETAIL A SCALE 2 : _ch11_EOC_ptg01.indd 6
7 Ø2.250 Problem (in.) Part Name: Retaining Ring Material: Stainless steel Problem (in.) Part Name: Collar Material: SAE X R X 458 X X Ø Ø X R.040 Ø Problem (in.) Part Name: Bearing Nut Material: SAE UNC-2B 458 X.125 R.06 Problem (in.) Part Name: Half Coupling (FLATS) Material: Ø1.250 C1215 steel Problem based on original art courtesy TEMCO. Ø Ø.891 Ø R X Ø X HALF OF PART SHOWN FOR CLARITY. OUTSIDE SURFACE OF COUPLING MUST BE FREE OF OXIDIZATION AND INK NPTF: L-1 GAGE, PLUS 1/MINUS 1 TURNS FROM NOMINAL. TAP FROM THIS END _ch11_EOC_ptg01.indd 7
8 Problem (in.) Part Name: Adjustment Screw Material: SAE 2010 steel.250 7/8-6-ACME-2G Problem (in.) Part Name: Packing Nut Material: Bronze A: Spanner slots.250 wide 3.0 deep. (Ø.875) Ø X A Ø UNF-2A THREADS NOT SHOWN A: SLOT WIDTH.250 SLOT DEPTH MEDIUM DIAMOND KNURL Problem (in.) Part Name: Pump Pivot Support Material: Cold rolled mild steel Problem (in.) Part Name: Screw Shaft Material: 3/4 hex 3 4 1/8 stock mild steel Ø.250 THRU Ø.313 THRU R UNF-3B 308 X.06 (HORIZ) UNC-1A R.06 Ø.50 Ø UNC-2B.75 Problem (in.) Part Name: Set Screw Material: Steel SPECIFIC INSTRUCTIONS: Prepare a detailed drawing from the written instructions below _ch11_EOC_ptg01.indd 8
9 Problem (in.) Part Name: Spiral Torsion Spring Material: SAE END.660 END Problem (in.) Part Name: Flat Spring Material: SAE Math Problems Part 2: Problems Through PROBLEM The taper of a pin is.5:12. What would be the taper for a 5 in. long pin? PROBLEM A lathe operator turns out 9 brass bushings in 2 hours 15 minutes. At the same rate, how many bushings can be turned in 8 hours? PROBLEM Seventeen drills cost $ What would seven drills cost? PROBLEM The scale on a landscape map is 1:50. If two points on the map are 3.50 apart, what is the actual distance between the two points? PROBLEM A crew of twelve people assembles 45 units a day. If production is to be increased to 80 units per day, how many people will be needed? PROBLEM If five dozen shop cloths are enough for six mechanics, how many cloths will be needed for eleven mechanics? PROBLEM A shop manual chain hoist requires a 22-lb pull to lift one ton (2000 lb). How much pull would it take to lift a 1500-lb load CLAMP LENGTH 2X Ø FORCE.806 SPRING DATA MATERIAL: SAE 40 SIZE:.125 FORCE AT DEFLECTION: 10,000 PSI 59728_ch11_EOC_ptg01.indd 9
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