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Chapter 7 Terms
Term | Definition |
---|---|
Aligned system | the dimension numbers are inline with the dimension lines |
basic hole system | design size of hole is basic size and the shaft allows tolerance |
basic shaft system | design where the shaft is the basic size and tolerance is given to the hole |
bilateral tolerances | allow variation in both directions |
datums | points,lines, and surfaces that are assumed to be exact |
dimension line | a thin line shows where measurement begins and where is ends |
dual dimensioning system | uses decimal inch and millimetre |
finish mark | shows a surface that needs to be machined or finished |
geometric dimensioning and tolerancing | the addition of size,shape,and material to a engineering drawing |
tolerance | the permitted variance from the actual dimension |
unidirectional system | all dimensions read from the bottom of the sheet |
unilateral tolerances | allows variation in only one direction |