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Limits, Fits, & Tolerances Flashcards

Module questions from the current module as well as last years module.

1
Q

What is the tolerance of 1.500 + /- .003

A

0.006

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2
Q

Calculate the limits of size for 1.875 +/- .010

A

1.865-1.885

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3
Q

If a shaft is 85.05 +/- .05 and the hole is 85 +/- 1, calculate the fit.

A

Transition fit

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4
Q

What is the meaning of FAO

A

Finish All Over

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5
Q

What is the meaning of MMC

A

Maximum Metal Condition

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6
Q

What is the meaning of A/F

A

Across Flats

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7
Q

Name two pieces of information found in a revision block.

A

1) Date
2) Description of revision
3) Revision number
4) Author

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8
Q

Name the three basic fits.

A

1) Clearance
2) Transition
3) Interference

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9
Q

What is allowance based on?

A

Maximum Metal Condition

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10
Q

The kind of tolerance, where the variation is in one direction only is called…

A

Unilateral tolerance

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11
Q

When the variation in size can be in either direction from the basic size, the tolerance is called…

A

Bilateral tolerance

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12
Q

Define: Allowance

A

An allowance is the intentional difference between mating parts at maximum material condition (MMC).

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13
Q

Define: Clearance fit

A

A clearance fit means the shaft will always fit into the mating hole. In other words, the diameter of the shaft will always be smaller that the diameter of the mating hole, even if both parts are at MMC.

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14
Q

Define: Interference fit

A

An interference fit is the opposite of the clearance fit. The diameter of the shaft will always be larger that the diameter of the mating hole, even when the shaft is as small as it can be and the mating hole is as large as it can be.

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15
Q

Define: Transition fit

A

A transition fit means the mating parts may have some clearance or some interference when assembled. At MMC there is interference between the parts, but when the parts are less than MMC there will be a smaller degree of interference or have some degree of clearance between the parts.

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16
Q

What is the meaning of HRMS

A

Hot Rolled Mild Steel

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17
Q

What is the meaning of CRMS

A

Cold Rolled Mild Steel

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18
Q

What is the meaning of SS

A

Stainless Steel

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19
Q

What is the meaning of MS

A

Mild Steel

20
Q

What is the meaning of MST

A

Machined Steel

21
Q

What is the meaning of ASSY

A

Assembly

22
Q

What is the meaning of BC

A

Bolt Circle

23
Q

What is the meaning of BCD

A

Bolt Circle Diameter

24
Q

What is the meaning of BHC

A

Bolt Hole Circle

25
Q

What is the meaning of CBORE

A

Counterbore

26
Q

What is the meaning of CHAM

A

Chamfer

27
Q

What is the meaning of CLA

A

Centre Line Angle

28
Q

What is the meaning of CL

A

Centre Line

29
Q

What is the meaning of CSK

A

Countersink

30
Q

What is the meaning of DIA

A

Diameter

31
Q

What is the meaning of DWG

A

Drawing

32
Q

What is the meaning of SF

A

Spotface

33
Q

What is the meaning of STL

A

Steel

34
Q

What is the meaning of SYM

A

Symmetry

35
Q

What is the meaning of TPF

A

Taper Per Foot

36
Q

What is the meaning of TPI

A

Taper Per Inch

37
Q

What is the meaning of TR

A

Taper Ratio

38
Q

What is the meaning of TYP

A

Typical

39
Q

Define UNC & UNF thread series

A

UNC - National Coarse

UNF - National Fine

40
Q

Thread designation “A” is a ___________ fit.

A

External (Alpha)

41
Q

Thread designation “B” is a ___________ fit.

A

Internal (Bitch)

42
Q

Class of thread fit 1A - 1B is for what type of fit?

A

Used for loose fits

43
Q

Class of thread fit 2A - 2B is for what type of fit?

A

Used for commercial fits, fasteners, interchangeable parts.

44
Q

Class of thread fit 3A - 3B is for what type of fit?

A

Used for high precision fits, close snug fit.

45
Q

Define: Roughness

A

Roughness is defined as having irregularities in the surface texture. The average roughness is designated in micro inches, micrometers, or roughness grade numbers from N1-N12.

46
Q

Define: Revision

A

Revision is a change or correction on the original drawing. The revision number is enclosed in a circle or triangle.

47
Q

Define: Reference dimension

A

The reference dimension is presented on the drawing for information only. It is not used in the manufacturing of the part.

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