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Millwright 1st Year > Measuring > Flashcards

Measuring Flashcards

1
Q

Nominal size

A

Refers to an imperial standard size, which is used for the purpose of general identification

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2
Q

Actual size

A

The measured size of a component is the actual (measured) size or dimensions

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3
Q

Basic size

A

The theoretical size to which the tolerances are applied

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4
Q

Limits of size

A

Limits of size are the largest size and smallest size a part can be and still be acceptable

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5
Q

MMC

A

Maximum material condition

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6
Q

Maximum metal condition

A

The smallest amount of metal has been removed

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7
Q

LMC

A

Least metal condition

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8
Q

Least metal condition

A

The largest amount of metal has been removed

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9
Q

Tolerance

A

The total amount of variation permitted in the size duplicate parts

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10
Q

Tolerance dimensioning can be specified by (2)

A

A plus-minus tolerance

A limit dimension

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11
Q

The two methods to express plus-minus dimensioning are

A

Unilateral

Bilateral

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12
Q

What tolerance is in one direction only from basic size and there is no variation (zero) in the other direction

A

Unilateral tolerance

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13
Q

Bilateral tolerance is

A

In both directions (equally and unequally) from basic size

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14
Q

Limit dimension method only the (2)

A

Maximum and minimum dimensions of the part are specified

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15
Q

The intentional difference between two mating parts

A

Allowance

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16
Q

The hole is to be larger (+) than the shaft

A

Positive allowance

17
Q

When the hole is smaller (-) than the shaft

A

Negative allowance

18
Q

The term fit describes

A

The tightness or looseness between two mating parts

19
Q

Fit types (3)

A

Interference fit
Clearance fit
Transition fits

20
Q

Interference fit is

A

The total tolerances do not exceed the allowance (negative allowance)

21
Q

Clearance fit has a

A

Positive allowance

22
Q

Transition fits

A

Have negative allowance but the total tolerances exceed the allowance

23
Q

An interference fit is when the

A

Smallest shaft is larger than the largest hole

24
Q

Clearance fit is when

A

The largest shaft will fit into the smallest hole (mmc)

25
Q

A ______ fit occurs when the limits of size result in either an interference or clearance fit

A

Transition fit

26
Q

Standard measuring temperature is

A

20° C or 68° F

Millwright 1st Year (10 decks)

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