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59 Cards in this Set

  • Front
  • Back
Each dimension should be given clearly for what reason?
So that it can be interpreted in only one way.
Dimensions should not be _____ nor should the same information be given in ____ ____ ____ way. No dimension should be given except those needed to produce the part.
A) duplicated
B) more than one
Dimensions should be given between points or surfaces that have a _______ ______ to each other or that control the location of mating parts.
functional relation
Dimensions should be given to _________________ in preference to rough surfaces wherever possible.
finished surfaces or important centerlines
Each dimension should be given clearly for what reason?
So that it can be interpreted in only one way.
Dimensions should not be _____ nor should the same information be given in ____ ____ ____ way. No dimension should be given except those needed to produce the part.
A) duplicated
B) more than one
Dimensions should be given between points or surfaces that have a _______ ______ to each other or that control the location of mating parts.
functional relation
Dimensions should be given to _________________ in preference to rough surfaces wherever possible.
finished surfaces or important centerlines
Dimensions should be given so that it will not be necessary for the machinist to __________.
calculate, scale, or assume any dimensions
Dimension features in the view where the feature's shape is best shown.
repeat
Dimensions should be placed in the views where the features dimensioned are shown true shape.
repeat
Dimensioning to hidden lines should be avoided wherever possible.
repeat
Dimensions should not be placed on a view unless clarity is promoted and long extension lines are avoided.
repeat
Dimensions applying to two adjacent views should be placed between views, unless clarity is promoted by placing some of them outside.
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The longer dimensions should be placed outside all intermediate dimensions so that dimension lines will not cross extension lines.
repeat
In machine drawing, all unit marks should be omitted, except when necessary for clarity.
EX 1" Valve
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Don't let people assume location of a feature, be sure to give a location dimension, unless it is centered. If it is centered be sure to mark the centerline.
repeat
A dimension should be attached to only one view, not to extension lines connecting two views.
repeat
Detail dimensions should line up in chain fashion.
repeat
A complete chain of detail dimensions should be avoided; it is better to omit one. Otherwise reference overall dimension by enclosing it within parentheses.
repeat
A dimension line should never be drawn through a dimension figure. A figure should never be lettered over any line of the drawing. The line can be broken if necessary.
repeat
Dimension lines should be spaced uniformly throughout the drawing. They should be at least ____ from object outline and ____ apart.
a)10mm
b)6mm
No line of the drawing should be used as a dimension line or coincide with a dimension line.
repeat
A dimension line should never be joined end to end with any line of the drawing.
repeat
Dimension lines should not cross , if avoidable.
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Dimension lines and extension lines should not cross if avoidable.
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When extension lines cross extension lines or visible lines, no break in either line should be made.
repeat
A centerline may be extended and used as an extension line, in which case it is still drawn like a centerline.
repeat
Centerlines should not extend from view to view.
repeat
Leaders for notes should be straight, not curved, and point to the center of circular views of holes.
repeat
Leaders should slope at 45, 30, or 60 degrees with horizontal, but may be made at any convenient angle except vertical or horizontal.
repeat
Leaders should extend from the beginning or the end of a note, with the horizontal "shoulder" extending from mid-height of the lettering.
repeat
Dimension figures should be approximately centered between arrowheads, except in a stack of dimensions, where they should be staggered.
repeat
Dimension figures should be about 3 mm high for whole numbers and 6 mm high for fractions.
repeat
Dimension figures should never be crowded or in any way made difficult to read.
repeat
Dimension figures should not be lettered over lines or sectioned areas unless necessary, in which case a clear space should be reserved for the dimension figures.
repeat
Dimension figures for angles should generally be lettered horizontally.
repeat
Fraction bars should never be inclined, except in confined areas, such as in tables.
repeat
The numerator and denominator of a fraction should never touch the fraction bar.
repeat
how should notes should always be lettered on the sheet?
Horizontally
Notes should be brief and clear, and the wording should be in standard form.
repeat
Finish marks should be placed on the edge views of all finished surfaces, including hidden edges and the contour and circular views of cylindrical surfaces.
repeat
Finish marks should be omitted on holes or other features where a note specifies a machine operation.
repeat
Finish marks should be omitted on parts made from rolled stock.
repeat
If a part is finished all over what should one do?
Finish marks should be omitted and instead use general note finish all over or FAO.
A cylinder is dimensioned by giving both its diameter and length in the rectangular view, except when notes are used for holes. A diagonal diameter in the circular way may be used in cases where it increases clarity.
repeat
Drill sizes should be expressed in decimals, giving the diameter. For drills designated by number or letter decimal size must also be given.
repeat
In general, a circle is dimensioned by its diameter, but what is an arc dimensioned by?
It's radius.
Diagonal diameters should be avoided except for very large holes and for circles of centers. They may be used on positive cylinders when clarity is gained.
repeat
A diameter dimension should always be preceded by what symbol?
A circle with a slash through it
A radius dimension should always be preceded by ___________. the radial dimension line should have only one arrowhead. It should pass or point through the arc center and touch the arc.
The letter R
Cylinders should be located by their _______.
Centerlines
Cylinders should be located in the circular views, if possible.
repeat
Cylinders should be located by coordinate dimensions in preference to angular dimensions where accuracy is important.
repeat
When there are several rough noncritical features obviously the same size it is necessary to give only one typical dimension or use a note.
repeat
When a dimension is not to scale what should be done?
Should underscore dimension with a heavy straight line or mark NTS or Not to Scale
Mating dimensions should be given correspondingly on both drawings of mating parts.
repeat
Pattern dimensions should be given in two place decimals or _______.
In common whole numbers and fractions to the nearest zero.
Decimal dimensions should be used for all machining dimensions.
repeat