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Chapter 7 Terms

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
Created by: 202444