HG91010

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: LINE
Specify first point: 0,0
Specify next point or [Undo]:  <Ortho on> 86
Specify next point or [Undo]: 40
Specify next point or [Close/Undo]: 20
Specify next point or [Close/Undo]: 28
Specify next point or [Close/Undo]: 66
Specify next point or [Close/Undo]: CLOSE

Command: REGION
Select objects: Specify opposite corner: 6 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]: 34

Command: RECTANGLE
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 0,0
Specify other corner point or [Area/Dimensions/Rotation]: @9,6

Command: RECTANGLE
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 0,0
Specify other corner point or [Area/Dimensions/Rotation]: @9,6

Command: EXTRUDE
Current wire frame density:  ISOLINES=4, Closed profiles creation mode = Solid
Select objects to extrude or [MOde]: Specify opposite corner: 4 found
Specify height of extrusion or [Direction/Path/Taper angle/Expression] <34.00>: 40

Command: SUBTRACT
Select solids, surfaces, and regions to subtract from ..
Select objects: 1 found
Select solids, surfaces, and regions to subtract ..
Select objects: Specify opposite corner: 4 found

Command: LINE
Specify first point: 8,12
Specify next point or [Undo]: 58
Specify next point or [Undo]: 28
Specify next point or [Close/Undo]: CLOSE

Command: REGION
Select objects: Specify opposite corner: 3 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] <40.00>: 10

Command: UNION
Select objects: Specify opposite corner: 4 found

HG91009

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>: 70,50

Command: LINE
Specify first point: 0,0
Specify next point or [Undo]:  <Ortho on> 62
Specify next point or [Undo]: 40
Specify next point or [Close/Undo]: 12
Specify next point or [Close/Undo]: 28
Specify next point or [Close/Undo]: 35
Specify next point or [Close/Undo]: 18
Specify next point or [Close/Undo]: 15
Specify next point or [Close/Undo]: CLOSE

Command: REGION
Select objects: Specify opposite corner: 8 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]: 40

Command: RECTANGLE
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 13,0
Specify other corner point or [Area/Dimensions/Rotation]: @14,18

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] <40.00>: 12

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

HG91008

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>: 70,60

Command: RECTANGLE
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 0,0
Specify other corner point or [Area/Dimensions/Rotation]: 66,52

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]: 50

Command: RECTANGLE
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 13,6
Specify other corner point or [Area/Dimensions/Rotation]: @40,40

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] <50.00>: 50

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

Command: RECTANGLE
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 13,13
Specify other corner point or [Area/Dimensions/Rotation]: @26,25

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] <50.00>: -6

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

Command: CYLINDER
Specify center point of base or [3P/2P/Ttr/Elliptical]: 13,12.5
Specify base radius or [Diameter]: DIAMETER
Specify diameter: 14
Specify height or [2Point/Axis endpoint] <-6.00>: -60

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

HG91007

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>: 90,60

Command: LINE
Specify first point: 0,0
Specify next point or [Undo]:  <Ortho on> 15
Specify next point or [Undo]: 40
Specify next point or [Close/Undo]: 50
Specify next point or [Close/Undo]: 40
Specify next point or [Close/Undo]: 15
Specify next point or [Close/Undo]: 55
Specify next point or [Close/Undo]: 80
Specify next point or [Close/Undo]: CLOSE

Command: REGION
Select objects: Specify opposite corner: 8 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]: 50

Command: CYLINDER
Specify center point of base or [3P/2P/Ttr/Elliptical]: 25,25
Specify base radius or [Diameter]: DIAMETER
Specify diameter: 15
Specify height or [2Point/Axis endpoint] <50.00>: -80

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

Command: CYLINDER
Specify center point of base or [3P/2P/Ttr/Elliptical]: 40,25
Specify base radius or [Diameter] <7.50>: DIAMETER
Specify diameter <15.00>: 50
Specify height or [2Point/Axis endpoint] <-80.00>: 38

Command: CYLINDER
Specify center point of base or [3P/2P/Ttr/Elliptical]: 40,25
Specify base radius or [Diameter] <25.00>: DIAMETER
Specify diameter <50.00>: 40
Specify height or [2Point/Axis endpoint] <38.00>: 38

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

Command: FILLET
Current settings: Mode = TRIM, Radius = 2.50
Select first object or [Undo/Polyline/Radius/Trim/Multiple]:
Enter fillet radius or [Expression] <2.50>: 25
4 edge(s) selected for fillet.

Command: UNION
Select objects: Specify opposite corner: 2 found

HG91006

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>: 60,40

Command: LINE
Specify first point:  <Ortho on> 0,0
Specify next point or [Undo]: 10
Specify next point or [Undo]: 32
Specify next point or [Close/Undo]: 28
Specify next point or [Close/Undo]: 16
Specify next point or [Close/Undo]: 12
Specify next point or [Close/Undo]: CLOSE

Command: MIRROR
Select objects: Specify opposite corner: 6 found
Specify first point of mirror line: Specify second point of mirror line:
Erase source objects? [Yes/No] <N>: No

Command: _.erase 1 found

Command: REGION
Select objects: Specify opposite corner: 10 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]: 8

Command: LINE
Specify first point: 24,24
Specify next point or [Undo]: 24
Specify next point or [Undo]: 16
Specify next point or [Close/Undo]: 14
Specify next point or [Close/Undo]: CLOSE

Command: REGION
Select objects: Specify opposite corner: 4 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] <8.00>: 8

Command: UNION
Select objects: Specify opposite corner: 2 found

Engineers Are Not Superhuman

"Engineers are not superhuman. They make mistakes in their assumptions, in their calculations, in their conclusions. That they make mistakes is forgivable; that they catch them is imperative. Thus it is the essence of modern engineering not only to be able to check one's own work but also to have one's work checked and to be able to check the work of others." - Henry Petroski

The Profile of Industrial Designer

"If the point of contact between the product and people becomes a point of friction, then the industrial designer has failed. On the other hand, if people are made safer, more efficient, more comfortable - or just plain happier - by contact with the product, then the designer has succeeded." - Henry Dreyfuss