ENGR 100 Cuyamaca College ITESM Puzzle Cube Design Problem Lab Report

Situation: Your design firm has been approached by a toy manufacturer with the request to design a 3-dimensional puzzle cube for children between 8 and 10 years old.

Problem Statement: Design a 3-dimensional puzzle cube for children 8-10 years old.

Design constraints:

1) The assembled cube must be composed of 3x3x3 smaller cubic elements.

2) The assembled cube must have overall dimensions of 2.25” x 2.25” x 2.25”.

3) The cube must be composed of 5 pieces, each a different color.

4) Each piece must incorporate between 3 and 6 smaller cubic elements.

5) Some of the pieces must interlock.

6) All parts are to be made of polyvinyl chloride (PVC)

Deliverables

1) A design report, composed of a cover sheet, an exploded assembly drawing, a bill of materials, and detail drawings of the 5 individual parts.

a) The cover sheet must be typed and include the following information

– Your name.

– The words ENGR 100

– The words Puzzle Cube Design Project

– Due Date

– Problem statement

– Design constraints

b) The exploded assembly drawing should

– be scale 2:3.

– show one part in a fixed position, with all other parts shifted away from it to show how they fit together. Preferably, each part should be shifted in one direction only. It is recommended that you choose a “central” piece of the puzzle to be the one in fixed position.

– show the parts oriented as they would be in the assembled puzzle.

– label the parts to agree with the Bill of Materials

– not include any dimensions.

– include the following information in the title block

– Your name

– The title Puzzle Cube Assembly

– Drawing number A-1

Follow this example, but do not copy this design

c) The bill of materials should

– List the individual parts

– Use the individual drawing number as the part number

– Be written on a separate page

Example

Bill of Materials

Item No. in Exploded View	Part Number	QTY	Description
1	PC-1	1	Red part
2	PC-2	1	Green part
3	PC-3	1	Blue part
4	PC-4	1	Yellow part
5	PC-5	1	White part

d) The 5 individual part drawings should each

– include front, top, and right side orthographic views with complete dimensions, drawn at 1:1 scale. Dimensions are in inches to 2 decimal places. Do not overdimension. Be careful not to assume dimensions. For example, in the front view shown below, notice that a dimension of .75 is given on both the lower right and lower left sides. Visually it appears that those two features have the same dimension. Don’t make that assumption.

– include a single-view general oblique drawing in the upper right corner. This view should show the front orthographic view in its true form, with the top and right side views receding. Do not include dimensions in this view. Draw this view at 2/3 scale, but do not include the scale information in the view.

– Include the material information in a drawing note as follows: MATL: PVC.

– Include the following information in the title bar

– Your name

– The part name (e.g. Red Part, Blue Part)

– Drawing number, PC-1 through 5

Example

2) A full-scale hardwood prototype

a) must be submitted fully assembled

b) Must be able to be disassembled into the 5 parts

b) individual parts must either be colored the appropriate color, or labeled with its part number or name

Checklist and Grading Criteria

Cover Sheet (5 pts)

_____ Your name + ENGR 100 + Puzzle Cube Design Project

_____ Due date

_____ Design statement

_____ Design constraints

Exploded Assembly Drawing (See example, p 4 of lecture notes) (15 pts)

_____ Drawing is scale 2:3

_____ Figure shows pieces shifted away from central piece

_____ All parts oriented correctly, to allow assembly of puzzle from the drawing

_____ Parts are numbered, and numbers agree with Bill of Materials

_____ Title bar includes Name, Puzzle Cube Assembly, and drawing number A-1

Bill of Materials (See example p 5 of lecture notes) (5 pts)

_____ Item numbers agree with Exploded Assembly Drawing

_____ Part numbers and descriptions agree with individual part drawings

_____ Bill of materials is written on its own page

Part Drawings (See example, p 5 of lecture notes) (5 drawing at 10 pts each = 50 pts)

_____ Front, top and side views drawn at 1:1 scale

_____ Single view pictorial is 2:3 scale, shown in upper right corner

_____ Drawing is fully dimensioned

_____ Dimensions are in inches to 2 decimal places (e.g. 1.50 rather than 1.5)

_____ Drawing is not overdimensioned

_____ Material information is provided in a drawing note as shown in example

_____ Title bar includes your name, part name (e.g. Red Part), and drawing number (PC-1 through 5)

_____ Part name and number agree with entry in Bill of Materials

Hardwood Prototype (25 pts)

_____ Prototype is submitted fully assembled

_____ Prototype is in a bag with your name in the bag

_____ Composed of 5 pieces

_____ Parts are identifiable either with color or labeled with part number or name

Points will be removed as follows

Cover Page	-5 pts if cover page is missing -5 pts if any constraint is violated (e.g. a part composed of more that 6 smaller elements) -3 pts if missing a single item (your name, ENGR 100, project name, problem statement, constraints) -5 pts if missing 2 or more items.
Exploded Assembly Drawing	-15 pts if exploded assembly view is missing -15 pts if not shown as exploded assembly view -15 pts if prototype can’t be built from drawing because one or more pieces in prototype not same as drawing -10 pts if prototype can’t be built from drawing because one or more pieces are oriented incorrectly in drawing -1 pt if parts not labeled in drawing, or drawing is not 2:3 scale, or scale information is not provided, or title bar is incorrect
Bill of Materials	-5 pts if BOM is missing -1 pt each if items do not agree with Exploded assembly view, or with individual part drawings
Individual Part Drawings	-10 pts if drawing is missing, or does not conform to US standard arrangement of views -1 pt for each missing dimension or error in dimension, up to a maximum of 6 pts -6 pts if all dimensions are missing -1 pt for each dimension not shown to 2 decimal places, to a maximum of 2 pts -1 pt if extension lines do not extend to feature being referred to -1 pt if dimension line is to a visible line rather than to an extension line -1 pt if dimensions are to a hidden line -5 pts if any view is missing -5 if the top or right view is oriented incorrectly relative to the front view, or if left view replaces right view -2 pts if excessively dimensioned -3 pts if a view is slightly offset, by accident -1 pt for each error in drawing -1 pt if pictorial orientation does not agree with multiview (front should be the same, and show the top and same side) -1 pt if material note is missing -1 pt if title bar information is incorrect
Prototype	-25 pts if prototype is missing -5 pts if parts are not identified by color or name or part number

examples:

ATTACHMENTS

l_piece.pdf

zag_piece.pdf

cross_piece.pdf

duck_piece.pdf

scientific_method_