IED EoC Study

6 steps of design process

1. define the problem

2. generate concepts

   1. more just research

   2. NVM use decision matrix here

3. develop solution

   1. , drawing

4. construct / test prototype

5. evaluate solution

   1. reflect and improve from testing

6. present solution

design brief

This concise document (no more than one page) identifies the client, clearly states his/her problem or need, details the degree to which the engineer will carry out the solution, and lists the rules and limits within which the engineer must perform.

deliverables

Project deliverables are the output you expect to have at the end of your project. Deliverables can be anything—a new product, marketing campaign, feature update, sales deck, a decrease in churn, or an increase in NPS.

project portfolio

Used to document the project and given to the people who offered the Design Brief (problem)

perspective sketch

A type of pictorial drawing in which vanishing points are used to provide the depth and distortion that is seen with the human eye.

natural looking and no distortion

oblique drawings

▪start with a straight-on view of the one of the object's faces, which is often the front face

▪angled, parallel lines are drawn to one side to represent the object's depth. common oblique angles include 30°, 45°, and 60°

pictoral sketch

▪2D illustrations of a 3D object

▪shows 3 faces of an object in one view

▪3 types:

-isometric

-obliques

-perspective

dimensioning rules

1. dimensions are actual size not scaled size

2. overall dimensions: width, height, depth

3. Include all dimensions necessary to produce or inspect the part.

4. Do not include unnecessary dimensions

5. Dimensions should be attached to the view that best shows the contour of the feature to be dimensioned. (usually front view)

6. A dimension should be attached to only one view; for example, extension lines should not connect two views.

7. Whenever possible, locate dimensions between adjacent views.

8. don’t dimension hidden lines

9. don’t place inside object

10. don’t cross dimension line with another dimension line or extension line

11. don’t cross with leader lines

12. leader lines cant be straight and must point to center

13. dimension values should be centered but staggered when stacked dimensions

14. a circle is dimensioned by its diameter and an arc by its radius

15. holes should be located and sized in the view that shows a circle

16. holes are located by their centerlines which may be extended and used as extension lines

types of lines

• object

  • Lines are thick and dark

  • used to define the object

• Construction

  • Very lightly drawn lines

  • used as guides to help draw all other lines and shapes properly.

• hidden line

  • dashed

  • used to show interior detail that is not visible from the outside of the part.

• center line

  • Lines that define the center of arcs, circles, or  Symmetrical parts. They are half as thick as an object line.

• section line / break line

  • Lines are used to define where there is material after a part of the object is cut away.

• extension lines

  • Lines used to show where a dimension starts and stops on an object.

• leader lines

  • Leader lines are used to show dimensions of arcs, circles and to help show detail.

ribbon

browser

geometric constraints

• perpendicular

• parallel

• tangent

• smooth

  • makes continuous curvature between curves

• coincident

  • constrains geometries together

• concentric

  • makes have same center point

• collinear

  • makes lie on same line

• horizontal

• vertical

• equal

  • makes have same radius or samelength

• fix

  • fixes in position

• symmetry

  • place features symmetrically on part

precedence of lines

Object lines take precedence over hidden and center lines.

Hidden lines take precedence over center lines.

Cutting plane lines take precedence over all others.

hole types

• clearance

  • Hole large enough to allow screw head (and driver) to pass through

• blind

  • Hole does not cut through entire thickness

• countersink

  • Conical-shaped recess around hole at surface

    Often used to accept tapered screw

• counterbore

  • Cylindrical recess around hole at surface

    Often used to receive a bolt head or nut

• tapped

  • hole has internal threads