Fixtures are devices that do three things:
Locates part(s) precisely, accurately, & consistently in 3-Dimensional Space
Secures part(s) so they cannot move from its location in 3-Dimensional Space
Supports part(s) against forces acting upon them (typically due to manufacturing processes/operations)
All three of these functions are essential to a proper fixture. Something that does not accomplish these three functions is not a fixture, and is likely something else...
Clamps are devices that perform one or two functions of a fixture. Clamps always 2) Secure; and sometimes, 3) Support parts, but do not 1) Locate parts
Clamps are still useful and often are an integral part of fixtures, but by themselves are lacking
Common examples of clamps include, but are not limited to: "Letter" Clamps ("C"-Clamps, "F"-Clamps, etc.), Vises (Bench vises, Machinist vises, etc.), Toggle clamps
Jigs are devices that position and guide a tool against a part, typically to assist in manufacturing processes/operations
Jigs are not fixtures as they do not perform the 3 primary functions of fixtures, since instead of locating/securing/supporting a part, they instead do those things to tooling
However, jigs can be incredibly useful and are often used in conjunction with fixtures to make manufacturing processes/operations even more efficient/precise
A Workflow is a defined sequence of tasks that produce a final outcome.
It can be seen as a roadmap for getting a particular job done, typically organized in a systematic, often chronological order.
Workflows are employed in various contexts, from business processes, software development, and manufacturing operations, to manage and guide the activities needed to achieve a specific goal.
At a very high level, all workflows - regardless of the type of work being done - can be categorized performed one of two ways:
Batch/Batching, where workflow steps are completed for multiple quantity (>1, AKA a "batch") of product/service at once
One-Piece-Flow, where workflow steps are completed for single quantity (1) of product/service at once
For several reasons, one-piece flow is the superior method of executing workflows:
Right-Sizing: It reduces the overall equipment size and capacity requirements to the bare minimum, allowing for optimal right-sizing of equipment and production processes. This means that the resources are matched more closely to the actual demand, leading to cost savings.
Waste Reduction: It reduces Lean wastes of overproduction, inventory, waiting, and more
Fast First Part Completion: The first fully-completed product is produced in the minimum time possible, enabling quicker response to customer orders and market demands. This not only enhances customer satisfaction but can also provide a competitive advantage in terms of lead time.