1 / 35

DIMENSIONAL ACCURACY

DIMENSIONAL ACCURACY. ENG 205 CE-ME-MECE-MSE. VOCABULARY. PRECISE (adjective):. Exactly the same We were gossipping about him, and he walked in at that precise moment. IMPRECISE (adjective):. Not exactly the same, containing some error or uncertainty

miriam
Télécharger la présentation

DIMENSIONAL ACCURACY

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. DIMENSIONAL ACCURACY ENG 205 CE-ME-MECE-MSE

  2. VOCABULARY

  3. PRECISE (adjective): Exactly the same • We were gossipping about him, and he walked in at that precise moment.

  4. IMPRECISE (adjective): Not exactly the same, containing some error or uncertainty • Many of the problems are a result of imprecise information.

  5. VARY (verb): to be different from something, differ • Class numbers vary between 30 to 35.

  6. VARIATION (noun): difference • There is great variation in temperatures of day and night.

  7. ACCURATE (adjective): exact,correct • My watch is not very accurate.

  8. ACCURACY (noun): the condition of being exact and correct • You can trust the accuracy of this report. Five people have checked it before you.

  9. TOLERANCE (noun):within/outside tolerance The acceptable difference in some measurement • We are working to a tolerance of 0.1mm. 5.1 mm is within tolerance, but 5.2 mm is outside tolerance.

  10. PRECISION (noun): The quality of being exact and accurate • Precision is highly important in science.

  11. RANGE (noun): the area of difference between upper and lower limits • Most of the university students are in the 17-25 age range.

  12. DEVIATION (noun): difference • There is a small deviation from the original plan.

  13. PLUS OR MINUS (preposition): Used when the number mentioned may actually be more or less a certain amount • There will be plus or minus twenty people for dinner.

  14. DEVIATE (verb): To be different from • The bus had to deviate from its usual route because of a road closure.

  15. INACCURATE (adjective): Not exact, correct or accurate • We got lost because the map was inaccurate.

  16. PERMISSIBLE (adjective): Allowed, acceptable • The lab found permissible levels of phosphate in the water, so it will not cause any problems for your health.

  17. TIGHT/CLOSE TOLERANCE (adjective+noun): A very small amount of tolerance • ± 0.01 mm is a tight tolerance.

  18. LOOSE TOLERANCE (adjective+noun): A big amount of tolerance • ± 0.1 cm is a loose tolerance.

  19. FIT (verb): To be the right shape and size for somebody or something • The key doesn’t fit the lock.

  20. FIT (noun): The way that something fits • The coat is a perfect fit.

  21. CLEARANCE(noun): Gap, space • There is not much clearance for vehicles to pass under the bridge.

  22. INSUFFICIENT (adjective): Not enough • I think the teacher gave insufficient time for this project. We can’t finish it on time.

  23. BIND (verb): To stick together • Will this wallpaper bind to the wall?

  24. PLAY (verb): To move freely as machine parts do • There was too much play in the steering wheel.

  25. INTERFERENCE (noun): The act of blocking, interrupting or preventing • In 1980, there was an interference with the democracy.

  26. EXPAND (verb): To increase in size • Metals expand when thay are heated.

  27. EXPANSION (noun): The act of increasing in size • There has been an expansion of higher education institutions recently.

  28. CONTRACT (verb): To decrease in size • Pipes contract in cold weather.

  29. CONTRACTION (noun): The act of decreasing in size • Electrical power lines look tight because of the contraction in cold weather.

  30. Talk about the questions in pairs.

  31. Partner A: Ask the questions.Partner B: Answer the questions. • What does tolerance mean in engineering? • If you have a shaft with a diameter of 30 mm ± 0.5 mm, what is within tolerance? What is outside tolerance? • What is a tight tolerance?

  32. Partner A: Ask the questions.Partner B: Answer the questions. • What does tolerance mean in engineering? Tolerances are acceptable variations in precision. Instead of giving one precise size, a tolerance gives a range of accebtable sizes. • If you have a shaft with a diameter of 30 mm ± 0.5 mm, what is within tolerance? What is outside tolerance? Shafts with a diameter of 29.5 to 30.5 mm are within tolerance. Less than 29.5 and more than 30.5 mm are outside tolerance. • What is a tight tolerance? A very small permissible deviation in size

  33. Partner B: Ask the questions.Partner A: Answer the questions. • What is a loose tolerance? • What is a clearance fit? Can you give an example? • What is an interference fit? Can you give an example?

  34. Partner B: Ask the questions.Partner A: Answer the questions. • What is a loose tolerance? A large permissible deviation in size • What is a clearance fit? Can you give an example? It allows a component to play freely by leaving clearance between itself and the sides of the hole. It is used in shafts. • What is an interference fit? Can you give an example? It is a very tight fit, and it doesn’t allow a component to move freely. It is done by forcing a component into a hole or by heating a component. It is used in train wheels.

  35. EXERCISES & OVER TO YOU

More Related