1. PRECISION MEASURMENT

2. Vocabulary 1.British imperial (U.S.) Systems 11.)00.1 2.Metric system 12.)inside micrometer 3.Psi 13.)dial caliper 4.Foot- pounds & Newton meters 14.)dial indicator 5.Plastigage 15.)depth micrometer 6.O.D. 16.)dial bore gauge 7.I.D. 17. )feeler gauge 8.Micrometer 18.)wire gauge 9.Thimble 19.)thread pitch gauge 10.sleeve 20.)straight edge

3. Precision measurement is needed to: Mass produce products ( assembly line) Mass produce products ( assembly line) Interchangeability of parts Interchangeability of parts Function of assemblies ( oil clearance - ect) Function of assemblies ( oil clearance - ect) Correct fit of assembly. Correct fit of assembly.

4. In one sixteenth of an inch (1/16) there are sixty two and one half thousandths (.0625) Fractions are not accurate enough for the automotive industry. Every part on your vehicle is manufactured using precision equipment capable of accuracy within thousandths of an inch.

5. Decimal system 1. 5 6 8 1. 5 6 8 One’s Tenth’s Hundredth'sThousandth’s

6. 4 place decimal 1. 2 5 7 9 1. 2 5 7 9 One’sTen’sHundred’sThousandth’s Ten Thousandth’s

7. Precision Measuring Tools

8. Outside Micrometer Outside mic’s come in one inch increments ( 0-1 1-2 2-3) Can measure to the ten thousandth of an inch. Use three scales to get the reading.

9. Outside Micrometer

10. Outside mic set standards

11. Dial Caliper Measures 0” – 6” O.D. I.D. & depth with.001 accuracy

12. Dial indicator Checks for movement.001 accuracy

13. Snap Gauge (set) Can a snap gauge give you a dimension?

14. Dial Bore gauge Best tool to check engine cylinder Bore -.0005 accuracy

15. Feeler gauge Used to check ________.001 accuracy

16. Spark plug gap gauge

17. Thread pitch gauge Metric & std.

18. Straight edge Accuracy along length -.001 Always used with feeler gauge

19. Torque wrench Foot LBS. In LBS. & Newton Meters How many Ft. lbs. should wheel lugs be?

20. Plasti-gauge Plasti-gauge crushed on journal Indicated clearance crankshaft

21. Parts of an outside Mic spindle Anvil - carbide Frame Sleeve or barrel Spindle lock Thimble Ratchet

22. How to Read a Micrometer

23. .025.500.010 Total :.535.025

24. Try these Mic’s

25. Micrometer Practice Read Thimble second Read sleeve first.025 +.025.050 total

26. .125

27. .130

38. How to read a Dial Caliper

39. .100 Read first Read dial second Total.100

40. .050

41. .739

42. 1.000 Dial =.010 Total 1.010

46. This thing was actually used to BBQ!