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Notice...
the holes dimensioned in the top view. Front views show extrusions dimensioned.
Section View A (top)- how the shape was sectioned to show the internal structure of part (front).
Notice...
identification of hole centers
diameter of holes are mentioned once
how other features are identified off of other features.
How NOT to Dimension
dimension only best view of feature.
dimension only what is necessary. Keep drawings clean and easy to read.
How a section view can help with dimensioning internal parts.
As drawings are created, the draftsman has think about how this part will be made (i.e., engineering tech at a lathe measuring with a yankee caliper and cutting to dimensions).
In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made. These are then referred to by one or more 'datum references' which indicate measurements that should be made with respect to the corresponding datum feature .
Chapter 4 - Dimensioning - 2016.pptxReport abuse