Engineering Design
People who will be impacted by the product.
What are stakeholders?
When selecting this COTS component, key considerations include torque, speed, and time of motion needed.
What is a motor?
This process allows designers to quickly test shape, function, and fit before paying for tooling.
What is prototyping?
These three categories describe how tightly a shaft fits into a hole.
What are clearance, transition, and interference fits?
This process is used for high-volume production of plastic parts and involves injecting molten material into a mold.
What is the injection molding?
This chart compares multiple design concepts to a baseline using +, - , 0 as ratings.
What is a Pugh Chart?
This type of component can be bought and includes things like fasteners, bearings, and springs. They reduce cost and simplify manufacturing.
What are COTS parts?
This philosophy aims to reduce the total number of parts, minimize reorientation, and simplify assembly tasks.
What is Design for Assembly (DFA)?
This system lets you express allowable part variation using symbols rather than long sentences of sadness.
What is GD&T?
This process involves deforming metal using compressive forces without removing any material, and includes rolling, forging, and extrusion.
What is metal forming?
A bar-chart style scheduling tool that is used to visually track tasks, durations, and dependencies across a project timeline.
What is a Gantt chart?
These components are chosen on load type, friction requirements, and rotational speed, and allow shafts to spin smoothly.
What are bearings?
This design approach considers manufacturing feasibility early on and includes analyzing tolerances, part geometry, material selection, and cost implications.
What is Design for Manufacturing (DFM)?
This element of GD&T frame defines the reference frame of the part and is essential for locating features relative to the design intent.
What is a datum?
A casting process where molten metal is forced into a steel mold under high pressure, producing parts with excellent surface finish and high dimensional accuracy.
What is die casting?
An engineering process tool that converts stakeholder needs into measurable engineering requirements.
What is the House of Quality?
This COTS component stores energy elastically and is frequently used to return mechanisms to an initial position or absorb impact. It is selected by using stiffness and deflection requirements.
What is a spring?
One reason to create multiple prototype versions using different methods such as 3D printing, machining, or cardboard models.
What is to elevate form, fit function, ergonomics, or manufacturability?
A feature control frame in GD&T must include at least these two things.
What are the geometric characteristic symbol and the tolerance value (and datums if applicable)?
This subtractive manufacturing process removes material using cutting tools and is used when tight tolerances and sharp edges are required.
What is machining?
The equation used to determine the degrees of freedom (mobility) of a mechanism from links and joints.
What is Gruebler's equation?
{ M = 3(L - 1) - 2J }
M - mobility L - # of links J - # of DOF joints
For a robot arm's motion, this type of motor is selected because it offers precise position control and automated joint movement.
What is a stepper or servo motor?
This prototype type is built to test how a product works rather than how it looks.
What is a functional prototype?
This GD&T control sets a 3D zone for how far a feature's axis can deviate from its exact intended location.
What is true position (position tolerance)?
This joining method permanently connects metal parts using molten filler material, often includes heat and sometimes shielding gas.
What is welding?