EGN1111C
Midterm term review
Midterm term review
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Flashcards
Never cross a _____________ line.
Dimension
What what is the distance to the first dimension from the object line? Second, third, forth, etc. dimensions?
3/8 of an inch then an additional 1/4 per extra dimension.
No dimensions on views except for:
Radius
Leaderlines can be at any length and any angle except for which angles?
90 and 180
Keep dimensions between views unless:
They are hitting other dimension lines, there is no room for them between views, you get a better description of the feature by dimensioning from the outside, or the only way to dimension between views is to a hidden line.
Used to transfer depth dimensions between top and right side views.
Mitre line
Dimensions used for mass production products
Limit
_______________ is the system of writing dimension numbers where verticle dimensions are written horizontally with all other dimensions.
Unidirectional
____________ is the system for writing verticle dimension numbers with the orientation of the object line.
Aligned
What are the two types of dimensions?
Size and Location
Used when a surface, edge, or center line is determined to be true and accurate. It is when a single surface, edge, or line is to be used as the starting point measurement.
Datum
Dimensions of a circle
Diameter
Dimensions of an arc
Radius
Dimensions of a rectangular prism.
Height, width, and depth
Dimensions of angles
Degree or limits
What are dimensions for the sokid cylinder?
Diameter and length
What are the dimensions for the cone?
Diameter for base and height
What are tolerances?
Total amount of variation permitted from the design size. It is the largest limit minus the smallest limit.
What is the design size? E.i; 2 X 4
The nominal size
What is allowance?
The tightest fit between two parts.
What are limits?
The largest and smallest a part or product is allowed to be.
What is Fit?
Amount of tightness or looseness between two mating parts.
Maximum Material Condition (MMC) is what?
The upper limits for external parts and lower limits for internal parts. Aka, allowance.
Least Material Condition (LMC) is:
The lowest limit for external parts and the upper limit for internal parts.
Geometric Demensioned and tolerances are used because of ___________________.
Universal mass production of parts
_____________ _____________ limites are given both + and - limits.
Bilateral Tolerance
___________ ___________ limits are given only one way, either upper or lower limit will have a value.
Unilateral Tolerance
What is clearance fit?
When there's always space between mating parts.
What is interference fit?
No space between mating parts. Also called a press fit.
What is transition fit?
Mating parts have both clearance and interference fits.
Which centerlines are the primary centerlines?
The centerlines that are in the center of the view.
Which type of hole needs a depth dimension?
Blind hole
What is block dimensioning?
A page tolerance that is used as a general note not covered by some other tolerancing type.
What are continued/chained dimensions?
Multiple dimensions placed end-to-end
What are baseline dimensions?
Multiple dimensions with offset dimension lines measured from the same location.
What are factors to consider when planning dimensions of mating parts?
The length of time they are to be engaged, speed at which they move, load they support, type of lubricant used, average tempurature they will operate in, humidity level, type of material, lifespan, capabilities of machinists operating the tool, and cost. (Length, speed, load, type, tempurature, humidity, material, lifespan, machinist, and cost)
