2D command in AutoCAD 2018 for gear is
1.circle command
2.arc command
3.offset command
4.trim command
The circle command is used to create gear parts inside and outside .the arc has many options but we use only one arc type to create complete gear 2d model in top view.
The offset is like copy command but we can change the dimensions too.the trim command is used to create cut the extraordinary part in 2d top view of gear.
The 3d command is used in AutoCAD 2018 are.
1.extrude command
2.3DO command
3.3d rotate. Command
4.presspull command
The extrude command is used to get 2d model into 3d model .the 3DO command is used to saw the model in 3d view.the 3d rotate command is used to rotate in any direction at any degree too.
The animation command important because it is used to move the two different object at the same time
If you need more information click here link below video.
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