Charbel seif mech 220 simple since each dimension is

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Unformatted text preview: ndent of other dimensions 01/05/13 1 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENSIONING drawing dimensioning schemes- (2) parallel dimensioning Principal dis-advantage: x Again, lousy tolerances! Splitting the accuracy tolerance on each side becomes a guessing game for the machinist Inst. Charbel Seif , Mech 220 01/05/13 1 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENSIONING drawing dimensioning schemes- (2) parallel dimensioning (2) Examine Condition C: x Possible remedy: Adding more dimensions to critical spots when more control is needed between the dimensions. Inst. Charbel Seif , Mech 220 01/05/13 13 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENSIONING drawing dimensioning schemes- (3) datum dimensioning drawing Datum (or BASELINE) dimensioning x x Setting up a Datum It is a precise and controlled system that eliminates tolerance accumulation. The best way to use a datum system pick the longest outside surface. Inst. Charbel Seif , Mech 220 01/05/13 1 Mech 220: 7th LECTURE Mech DIMENSIONING DIMENSIONING drawing dimensioning schemes- (3) datum dimensioning Dimensioning x x Identify your datum, then place points on the baseline representing the minimum spacing for stacking dimension lines according to standards. Begin dimensioning to the closest feature, then dimension to the next features placing t...
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