CAD & 3D PRINTING

​Types of lines

By J T

Multiple Choice

Identify the application for this line.

• Hidden outlines and edge

• Cutting planes

• Interrupted views

• Centre lines

Multiple Choice

Identify the type of line highlighted in yellow.

• Hatching line

• Centre line

• Cutting planes

• Hidden lines

Multiple Choice

What line is the red arrow pointing at?

• Hidden line

• Hatching line

• Centre line

• Visible edge

Multiple Choice

What is A/F?

• Across Face

• Across Flat

• Above Flat

• Anytime Fitness

Multiple Choice

What is A/C?

• Aircon

• Across cut

• Across corners

• Across circle

The numbers are in micrometers!!!
You need to divide by 1000 to change to mm.
Note on the machining process if you can see the triangle

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​Surface Finishing

Multiple Choice

What is CSK?

• Countersink

• Countersunk

• Counterstrike

• Countingstars

Multiple Choice

What does the symbol mean?

• Machining process with surface texture of 0.5mm

• Grinding process with surface texture of 0.005mm

• Machining process with surface texture of 0.005mm

• Milling process with surface texture of 0.5mm

Multiple Choice

What does the symbol mean?

• Milling process with surface texture of 0.5 to 0.8 mm

• Milling process with surface texture of 0.005 to 0.008 m

• Machining process with surface texture of 0.5 to 0.8 mm

• Milling process with surface texture of 0.005 to 0.008 mm

Multiple Choice

What is needed for this surface finishing?

• Hand file

• Machining

• Sandpaper

• Bending

Focus on the highlighted symbols. Most common.
Remember the rest if you can.

​

Difference types of symbols for geometry

Multiple Choice

What is the geometrical tolerance shown in the figure?

• Surface is perpendicular to A with 0.030mm tolerance

• Surface is parallel to A with 0.030mm tolerance

• Surface is flat to A with 0.030mm tolerance

• Surface is straight to A with 0.030mm tolerance

Multiple Choice

What is the geometrical tolerance show in the figure?

• Surface is perpendicular to A with 0.08mm tolerance

• Surface is parallel to A with 0.08mm tolerance

• Surface is perpendicular to A with 0.008mm tolerance

• Surface is colinear to A with 0.08mm tolerance

You have only used these 3 planes!!
Remember only Front, Top and Right!!!

Only 6 views: TOP, BOTTOM, FRONT, BACK, LEFT, RIGHT

​

Planes in Solidworks

Multiple Choice

What are the 3 default planes used in Solidworks?

• Right, Bottom, Front

• Front, Left, Top

• Top, Front, Side

• Top, Right, Front

Multiple Choice

What are the views in solidworks?

• Top, Bottom, Front, Back, Side, End

• Top, Bottom, Front, Back, Left, Right

• Top, Down, Left, Right, Front, Back

• Top, Bottom, Front, Back, Side, Left

Creates a bevel on the edge.
Straight line
For example: 5 x 45°
means 5 mm at 45° angle

Chamfer

Not fillet O fish.
Creates a curve on the edge.
For example: R10 means curvature of 10mm radius

Fillet

You see the number is aligned with the arrows.

Aligned System

You see the numbers are all in the same direction.

Uni-directional System

​Your text here

If cannot see, Mr Tan bring you to Owndays make specs..

Chain Dimensioning

Parallel Dimensioning

Have mix of chain and parallel.

Combined Dimensioning

Coordinate Dimensioning

Equidistant Dimensioning

​Your text here

Uses X and Y coordinates

​Your text here

Must MEMORISE ALL!!

Multiple Choice

Identify the type of dimensioning used in the figure.

• Parallel dimensioning

• Coordinate dimensioning

• Chain dimensioning

• Combined dimensioning

Multiple Choice

Identify the type of dimensioning.

• Combined dimensioning

• Chain dimensioning

• Parallel dimensioning

• Coordinate dimensioning

Multiple Choice

What is the type of dimensioning used?

• Chain

• Combined

• Parallel

• Coordinate

Object on left, drawing on right

First Angle

Drawing on left, Object on right

Third Angle

Person always see from left to right

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MUST KNOW!!!

Multiple Choice

What angle of projection is this?

• First

• Second

• Third

• Fourth

Remember First Angle, Front view will be above.
Third Angle, Top view will be above

Note: Front view will always have Side and Top views next to it.

​

How to identify views

Multiple Choice

What projection is this?

• First angle

• Second angle

• Third Angle

• Fourth Angle

Multiple Choice

What angle of projection is used?

• First

• Second

• Third

• Fourth

Multiple Choice

What angle of projection is used?

• First

• Second

• Third

• Fourth

Types of views

Auxiliary View: Find true length of sloping line

Section View: To see complex or internal features

Detail View: To provide clearer view of a portion of the part

Memorise THESE!!

Multiple Choice

What is this section view?

• Offset

• Full

• Aligned

• Half

Multiple Choice

What is this section view?

• Half

• Offset

• Part

• Removed

Multiple Choice

What are these section views?

• Revolved

• Broken

• Removed

• Offset

Multiple Choice

What section view is shown?

• Offset

• Half

• Full

• Aligned

ONLY ONE sign.
+, + or -, -

Unilaterial

Have 2 different signs.
Plus and minus!! +,-

Bilateral

Means plus and minus are same number.

Symmetrical

MUST KNOW!!!

Multiple Choice

What tolerance is this?

• Unilateral

• Bilateral

• Symmetrical

• Trilateral

Multiple Choice

What tolerance is this?

• Unilateral

• Bilateral

• Trilateral

• Symmetrical

Multiple Choice

What tolerance is this?

• Unilateral

• Bilateral

• Free

• Symmetrical

Shaft can always go through hole.
Shaft smaller than hole or,
Hole bigger than shaft

Clearance fit

Shaft CANNOT go through hole.
Shaft bigger than hole or,
Hole smaller than shaft.

Interference fit

Shaft sometimes can go through hole, sometimes cannot

Transition fit

Multiple Choice

Hole is smaller than shaft. What is the fit?

• Clearance fit

• Interference fit

• Transition fit

• Good fit

Multiple Choice

The shaft is 15.04mm and the hole is 15.08mm. What is the fit?

• Clearance fit

• Transition fit

• Interference fit

• Throw a fit

Remember the clearances is always HOLE minus SHAFT!

Max clearance = BIG hole - SMALL shaft
Min clearance = SMALL hole - BIG shaft

Remember this table!

• Clearance = +,+

• Interference = -,-

• Transition = +,-

Always calculate the upper limits and lower limits of hole and shaft first.
Next find the max and min clearance!

​

What if the hole and shaft have tolerances??

Multiple Choice

If the max and min clearances are + , -, what is the fit?

• Clearance

• Transition

• Interference

• Big

Multiple Choice

What is max clearance?

• Upper limit of hole - Upper limit of shaft

• Lower limit of hole - Lower limit of shaft

• Upper Limit of shaft - Lower Limit of hole

• Upper Limit of hole - Lower Limit of shaft

How to read this?

Multiple Choice

Minimum clearance is

• Upper limit of hole minus lower limit of shaft

• Lower limit of shaft minus upper limit of hole

• Lower limit of hole minus upper limit of shaft

• Lower limit of hole minus lower limit of shaft

• See table, capital letter refers to holes. Small letters refer to shaft

• 5 refers to the basic size of 5mm. 5mm is between 3 to 6mm. So it is in the second row.

• Find H7 and h6 in the top rows. The numbers are in micrometers. Need to divide by 1000.

Fill in the Blanks

Multiple Choice

What is the fit for 5H7k6?

• Clearance Fit
• Transition Fit
• Interference Fit
• Loose Fit

Straight vertical and horizontal lines
For drawing 2D views

​​Orthogrid

Diagonal lines
For drawing 3D isometric views

Isogrid

Isometric drawing always use lines at 30° and 90°.

Diagonal Method: Always see V and H.

Ordinate Method:

American Method: when you see stars

Multiple Choice

What paper is this?

• Orthogrid

• Isogrid

• Many grid

• Square grid

Multiple Choice

What method is this?

• American

• Diagonal

• Ordinate

• Coordinate

Multiple Choice

What method is this?

• American

• Ordinate

• Diagonal

• Coordinate

Multiple Choice

What method is this?

• American

• Diagonal

• Ordinate

• Coordinate

Holiday is coming soon. Just hang in there..

3D printing (Additive Manufacturing)

3D scanner used to create digital copy of the object.
Selective Laser Melt: Use Laser to MELT powder
Fused Deposition Modeling: Use thermoplastic
Stereolithography: Use photopolymer resin

Remember Support structures only for more than 45°.