Fixture

A fixture is the physical device, such as a vise, clamp set, or custom-built holding tool, used to hold a workpiece in a known, repeatable position during machining. It is distinct from fixturing, the broader activity of planning and executing how a part is held; a fixture is the tool, fixturing is the practice.

Why fixture cost depends on expected volume

A custom fixture adds upfront design and build cost but can dramatically cut per-part handling time on a longer run, which is why fixture investment is typically a make-or-buy-style decision weighed against expected quantity.

Where fixture decisions are made

Not on the drawing; fixture design is a work-preparation decision made in response to a part's geometry and the required setups, not something specified by the engineer.

Common mistakes

Designing a custom fixture for a one-off or very low-volume part where a standard vise or clamp set would have done the job at a fraction of the cost and lead time.

Is a fixture the same as fixturing?

A fixture is the physical holding device; fixturing is the broader activity of choosing and using a fixture (or another method) to hold a part.

When does a custom fixture make sense?

Typically for higher-volume parts or complex geometry, where the upfront design and build cost is justified by time saved across many parts.

Can the same fixture be reused across different parts?

Sometimes, if a modular or standard fixture accommodates the part family; otherwise a new fixture is usually needed per distinct part geometry.