tailieunhanh - Modelling with AutoCAD 2002 Episode 9

Tham khảo tài liệu 'modelling with autocad 2002 episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Solids editing 233 6 Select the COPY FACES icon from the Solids Editing toolbar and prompt Select faces respond pick face 2 then right-click enter prompt Specify a base point or displacement respond Endpoint icon and pick pt3 prompt Specify a second point of displacement enter @50 0 100 R then exit the command 7 The selected face is copied as fig d 8 Erase all objects from the screen and create two primitives a cylinder centre 0 0 0 radius 30 height 100 b cone centre 0 0 200 radius 100 height -150 c union the cone and cylinder - fig e 9 Select the SHELL icon from the Solids Editing toolbar and prompt Select a 3D solid respond pick any point on the composite then right-click enter prompt Enter the shell offset distance enter 10 R then X R and X R 10 The cylinder cone is offset by 10 in all directions - fig f 11 Hide the model then regen 12 With the EXTRUDE FACES icon a pick any point on the top face b extrusion height -10 c angle of taper 0 - fig g 13 Repeat the extrude faces command and a pick any point 4 on the new rim of the composite b extrusion height 50 c angle of taper 5 - fig h This completes the third solids editing example. Other solids editing options Not all of the solids editing options have been used in the worked examples. The following is a brief description of those not considered a Clean removes all redundant edges and vertices . imprinted edges b Separate separates 3D solid objects with disjointed volumes into independent 3D objects. It DOES NOT separate composites created by Boolean operations into the original primitives. c Check confirms that a selected object is a valid ACIS solid d Color Edges Faces a very useful option as it allows individual edges and faces to be coloured . a cube could be created on layer MODEL red and the six faces of the cube assigned different colours. e Copy Edges Faces should be obvious f Delete faces allows faces of a model to be deleted but the option has obvious limitations. Useful with fillet chamfer edges.