HG91001

The steps for the design of this exercise in AutoCAD are as follows:

Command: LIMITS
Reset Model space limits:
Specify lower left corner or [ON/OFF] <0.00,0.00>: 0,0
Specify upper right corner <420.00,297.00>: 100,50

Command: RECTANGLE
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 0,0
Specify other corner point or [Area/Dimensions/Rotation]: @80,20

Command: CIRCLE
Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 40,20
Specify radius of circle or [Diameter]: 7

Command: TRIM
Current settings: Projection=UCS, Edge=None
Select cutting edges ...
Select objects or <select all>: 1 found
Select objects: 1 found, 2 total

Command: REGION
Select objects: Specify opposite corner: 2 found
1 loop extracted.
1 Region created.

Command: EXTRUDE
Current wire frame density:  ISOLINES=4, Closed profiles creation mode = Solid
Select objects to extrude or [MOde]: 1 found
Specify height of extrusion or [Direction/Path/Taper angle/Expression]: 30

Command: CYLINDER
Specify center point of base or [3P/2P/Ttr/Elliptical]: 10,15
Specify base radius or [Diameter]: DIAMETER
Specify diameter: 10
Specify height or [2Point/Axis endpoint] <30.00>: 20

Command: SUBTRACT
Select solids, surfaces, and regions to subtract from ..
Select objects: 1 found
Select solids, surfaces, and regions to subtract ..
Select objects: 1 found