Dimensioning and Tolerancing Fundamentals

False (B)

The zone is wedge-shaped, allowing more tolerance at one end than the other.

<p>concentricity</p> Signup and view all the answers

<p>Profile of a surface = Controls shape and location of a contour when datums are specified Perpendicularity = Controls orientation relative to a datum Circular runout = 2D control of a surface relative to a datum axis Maximum Material Condition = Contains the maximum amount of material within size limits</p> Signup and view all the answers

<p>SI and U.S. Customary (D)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>lower right-hand corner</p> Signup and view all the answers

<p>1 mm</p> Signup and view all the answers

<p>|___| = Counterbore / = Countersink</p> Signup and view all the answers

<p>10 mm (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>free state</p> Signup and view all the answers

<p>To eliminate the accumulation of tolerances (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>American Society of Mechanical Engineers</p> Signup and view all the answers

<p>wide</p> Signup and view all the answers

<p>Locational Clearance Fits = Provide a snug fit for locating stationary parts Force or Shrink Fit = Maintains constant bore pressures throughout the range of sizes Free Running Fit = Good for large temperature variations and high running speeds Sliding Fit = Intended to move and turn freely while locating accurately</p> Signup and view all the answers

<p>It can increase the maximum distance between features. (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Specifying depth</p> Signup and view all the answers

<p>datums</p> Signup and view all the answers

<p>Position tolerance (C)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>The same number</p> Signup and view all the answers

<p>datums</p> Signup and view all the answers

<p>The feature is repeated a certain number of times. (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>smallest</p> Signup and view all the answers

<p>A method of assigning tolerances based on sound statistical practices.</p> Signup and view all the answers

<p>Clearance Fit (D)</p> Signup and view all the answers

<p>RC = Running or sliding clearance fit LC = Locational clearance fits LN = Locational interference fit FN = Force fit</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>A minimum three-point contact with the back surface of the object.</p> Signup and view all the answers

<p>allowance</p> Signup and view all the answers

<p>3 millimeter thickness (A)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>They may assign dimensions improperly, like 0.075 ± 0.02.</p> Signup and view all the answers

<p>rigidity and alignment</p> Signup and view all the answers

<p>Medium drive fit (A)</p> Signup and view all the answers

<p>Wedge-shaped (A)</p> Signup and view all the answers

<p>Parts may function improperly (C)</p> Signup and view all the answers

<p>Shape, size, and location of the contour (D)</p> Signup and view all the answers

<p>Flatness (A)</p> Signup and view all the answers

<p>Basic dimensions locate the perfect position of features from identified datums. (B)</p> Signup and view all the answers

<p>Features are dimensioned relative to one another. (B)</p> Signup and view all the answers

<p>1 mm (B)</p> Signup and view all the answers

<p>10 mm (B)</p> Signup and view all the answers

<p>SI; U.S. Customary (A)</p> Signup and view all the answers

<p>A counterbore (C)</p> Signup and view all the answers

<p>A zero is omitted before the decimal point for dimensions less than one inch. (B)</p> Signup and view all the answers

<p>To apply tolerances in the most favorable conditions (B)</p> Signup and view all the answers

<p>The accumulation of tolerances between two features (B)</p> Signup and view all the answers

<p>Locational transition fit (C)</p> Signup and view all the answers

<p>Parallelism (B)</p> Signup and view all the answers

<p>Feature control frame (C)</p> Signup and view all the answers

<p>Force or shrink fit (A)</p> Signup and view all the answers

<p>Sliding fit (B)</p> Signup and view all the answers

<p>Orientation of a surface or hole (C)</p> Signup and view all the answers

<p>Only the most critical features (A)</p> Signup and view all the answers

<p>Deviations are restricted to one direction only. (D)</p> Signup and view all the answers

<p>Free running fit (A)</p> Signup and view all the answers

<p>It is preferred over chain dimensioning (C)</p> Signup and view all the answers

<p>Interference Fit (D)</p> Signup and view all the answers

<p>A space or clearance always exists between mating parts. (C)</p> Signup and view all the answers

<p>Diameter symbol (B)</p> Signup and view all the answers

<p>To assign tolerances based on statistical practices. (A)</p> Signup and view all the answers

<p>Its tolerance (C)</p> Signup and view all the answers

<p>Tolerance (D)</p> Signup and view all the answers

<p>Dimension hole features as circles where they appear. (C)</p> Signup and view all the answers

<p>Locational transition fit (D)</p> Signup and view all the answers

<p>A feature is standard and repeated. (A)</p> Signup and view all the answers

<p>Without a plus or minus sign. (C)</p> Signup and view all the answers

<p>Locational Transition Fit (B)</p> Signup and view all the answers

<p>With the same number of decimal places as the basic size. (D)</p> Signup and view all the answers

<p>Allowance (C)</p> Signup and view all the answers

<p>Force Fit (A)</p> Signup and view all the answers

<p>To enable clearer specification of design intent. (B)</p> Signup and view all the answers

<p>Minimum three-point contact. (B)</p> Signup and view all the answers

<p>Choose the type of fit required. (A)</p> Signup and view all the answers

The total amount of variation in a part's position when it rotates around an axis.

Controlling the shape and position of rotating parts using datums (specified reference points).

Dimensions that precisely locate features on a part, theoretically perfect.

Drawings use either the SI (metric) or U.S. customary system.

Use a zero before the decimal point.

Skip decimal point and zero.

Allowances or variations in measurements

Linking dimensions of features to relate their positions.

The condition where a feature has the most material within its size limits.

Controls the orientation of a surface or axis relative to a datum.

Controls the axis-to-axis relationship of two features.

2D control of a surface relative to a datum axis.

Making parts to very tight tolerances makes manufacturing harder and more expensive.

A dimensioning method where all dimensions in a given direction originate from a common base or datum. It's often used in CNC machining.

The permitted variation in a dimension.

A standardized way to specify geometric tolerances on a drawing.

Tolerances that control the shape of individual features, separate from their location.

A 3D tolerance zone to control both the location and orientation of a center, axis, or center plane of a part feature.

A type of 2D tolerance that defines a zone for a line's shape.

A 3D tolerance that controls how parallel a surface is to a specified datum.

A 3D tolerance that controls the angle between a surface or axis to a specified datum.

Optical comparators and mechanical gaging are used to assess profile tolerances.

Allows for a small amount of clearance or interference, important when accuracy of location is essential.

Tolerances are tight, maintaining consistent pressure throughout size variations.

Tolerances permit plenty of movement and wide variations.

Cylindrical features (like shafts or holes) are best dimensioned in the view where they appear as rectangles.

"TYP" or "TYPICAL OF" indicates a feature is repeated multiple times in a drawing.

Engineering drawing dimensions are assumed to be at room temperature and pressure.

In a unilateral tolerance, the deviation from the basic size is in one direction (either above or below).

For metric dimensions, a single zero is used without a plus or minus sign, implying a zero tolerance.

When dimensioning in inches, tolerance values use the same number of decimal places as the basic size, with appropriate + or - values.

Tolerance where the highest and lowest acceptable sizes are explicitly shown.

Direct dimensioning minimizes tolerance accumulation by placing a single dimension between two key points.

A method of assigning tolerances based on statistical analysis instead of conventional practices.

Statistical tolerancing can sometimes result in overly restrictive tolerance values.

A clearance fit ensures a space between mating parts.

An interference fit ensures the parts interlock.

A process where parts are measured and matched to ensure a precise fit.

Dimension lines should be at least 10 mm from any view to avoid visual clutter.

When dimensioning, a gap of at least 1 mm should be between extension lines and object geometry.

All dimensions and tolerances apply to parts in a free state, but this does not apply to non-rigid parts.

A plane established by a single point of contact on a surface, perpendicular to both the primary and secondary datum surfaces.

A method of tolerancing where the maximum and minimum variations are added or subtracted from the nominal size.

Dimensions should only be placed on visible or solid lines in a drawing.

Each dimension should be placed in the view where the contour shape is best shown.

Best practice is to dimension hole features in the view where they appear as circles.

Best practice is to dimension cylindrical (solid) features in the view where they appear as rectangles.

The nomenclature "TYP" or "TYPICAL OF" indicates that a feature is repeated exactly in the drawing a certain number of times.

Dimensions in an engineering drawing are assumed to be at room temperature and pressure.

For metric dimensions, a single zero is shown without a plus or minus sign.

Statistical tolerancing usually results in tolerance values being more restrictive than necessary.