The Mechanical, Electrical and Plumbing Consultants use the xref floor plans from the Architect. If changes are made from the Architect, the Consultants drawings are updated. A complex motor 3D model is created by xref all the minor components in detail. The sum of the parts create the complete motor. If one part is revised the motor drawing will reflect the change and what reactions it will have on the whole.
Blocks are an excellent way to add repetitive objects placed in a current drawing session.
Not only does it make quick work of repeated geometry, it also reduces the drawing file size. Once a block is inserted into a drawing it is defined. Having more than one occurrence of the same block doesn't add twice the amount of memory the block has. AutoCAD uses the same definition information for each occurrence of the same block. You can define a block with these methods.