2). Datum dimensions are where a single reference point is used for all dimensions in a single direction, while chain dimensions are where each point is measured to the next. Datum dimensions result in smaller dimensional deviation in manufactured parts.
3) With a dimension drawing, you can visually convey it, while through a written description you can verbally covey it. A dimension drawing is usually more accurate.
The first two drawings do not include all the dimensions; it is impossible to know the depth of the objects. In addition, not all the views are included and not all the views are necessary. I see four isometric views on the first one but no side view.
ReplyDeleteHowever, the third one looks perfect to me
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