Begin dimensioning to the closest feature then

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Unformatted text preview: hem on the next baseline points Inst. Charbel Seif , Mech 220 01/05/13 15 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENSIONING drawing dimensioning schemes- (3) datum dimensioning Principal advantages: 1) 2) 3) Precise method Reflects how a part is machined ELIMINATES Tolerance accumulation Principal dis-advantage: Takes up too much space Inst. Charbel Seif , Mech 220 01/05/13 1 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENSIONING drawing dimensioning schemes- (3) datum dimensioning x Chained – Each dimension continues from the previous one. – Tolerances stack – Saves drawing space Inst. Charbel Seif , Mech 220 x Datum – Each dimension is specified from a common baseline. – Tolerances do not stack. – Takes up too much of drawing space 01/05/13 1 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENSIONING drawing dimensioning schemes- (4) ordinate dimensioning x x Once the origin is established you can start placing extension lines 1/16” off the feature. Each distance is measured in the X or Y direction and placed at the end of the extension line. Inst. Charbel Seif , Mech 220 01/05/13 1 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENS...
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