Tolerances Introduction to Engineering Design © 2012 Project Lead The Way, Inc.

Click on the Link Below: What is Tolerance? Now, in your own words, answer these questions and turn in for a grade: When manufacturing items in a factory, can every part be completely, exactly, the same size every time? How do engineers overcome this limitation of factories? (starts with a T) Write this sentence with the correct words: Tolerances are expressed as the m__ allowable and the m_ allowable, and everything in between.

Presentation Name Course Name Unit # – Lesson #.# – Lesson Name Definitions Tolerance is the total variance in a dimension and is equal to the difference between the upper and lower limits. Tolerance = Upper Limit – Lower Limit 0.10 = 1.55 – 1.45 If a part is manufactured outside of the limits established by the tolerance, the part is said to be “out of tolerance”.

Definitions Limits are the maximum and minimum sizes shown by the toleranced dimension Upper limit is the maximum allowable dimension Lower limit is the minimum allowable dimension Upper Limit = Specified Dimension + positive variance 1.55 = 1.50 + 0.05 Lower Limit = Specified Dimension + negative variance 1.45 = 1.50 + (– 0.05)

Tolerances Click on This Link Read the material Answer the question Reveal the Answer Go to page 2 Answer 2 questions Reveal the answer Move on to the Test Show Mrs. Booher your score

Presentation Name Course Name Unit # – Lesson #.# – Lesson Name Out of Tolerance A manufactured part is said to be out of tolerance if the part is not within specified limits Manufacturing facilities often institute quality control measures to help ensure that parts are within tolerance

What is the Tolerance of this part? Presentation Name Course Name Unit # – Lesson #.# – Lesson Name Question #4 For the part below, state the lowest acceptable length and the highest acceptable length. What is the Tolerance of this part?