Size marking is an important link in die design.

An analysis of all kinds of common marking methods in Auto CAD2000 size marking, including more typical marking with prefix and suffix and linear marking, is presented.

It realizes intelligentize size marking of crank-shaft with Pro/Engineer and it s secondary development technology, and implements working instruction of numerical control machine and fufils CAD/CAM integration through data transmission between CAD/CAM .

Research of intelligent dimensioning technology based on Solid Edge’s dimension object;

First,text segmentation and pixel vectorization for scanned drawing are outlined,then the dimensioning characteristics and rules for mechanical engineering drawings are analyzed,and geometry reconstructed method for dimension frame driven by text region is described.

Based on the analysis of the general variants of sophisticated tolerance dimensioning forms and their dimensioning methods of mechanical drawing in Auto CAD, setting skills of items under "tolerance" option are elaborated with practical examples, which will help to make a specific and artistic drawing.

The calculation of the coordinate dimension of the spindlehead can be easily done.