What is Setup Time? Definition & Manufacturing Examples

What is Setup Time?

Setup time, also called changeover time, is the time required to prepare a machine or work center for a new production operation. It includes changing tools, loading CNC programs, mounting fixtures, adjusting settings, and running first-article verification parts. Setup time is non-productive — the machine is occupied but not producing saleable parts. In high-mix manufacturing environments where machines frequently switch between different parts, setup time can consume 20 to 40 percent of available capacity, making it one of the most important factors in scheduling and capacity planning.

How Setup Time Works in Manufacturing

Setup time occurs every time a machine transitions from one job to the next. The duration depends on the complexity of the changeover and the difference between the outgoing and incoming parts. A simple program change on a CNC machine might take 15 minutes. A full tooling, fixture, and program change on a complex 5-axis machining center might take 4 hours.

Setup time can be fixed or sequence-dependent. Fixed setup time is the same regardless of what was previously running — common when every job requires a complete teardown and rebuild. Sequence-dependent setup varies based on the transition. Going from a 6-inch to an 8-inch chuck takes less time than going from a 6-inch to a completely different fixture.

In scheduling systems, setup time is specified in the routing alongside run time. The total operation time equals setup time plus run time. For small batches, setup can dominate total operation time. A 2-hour setup for a 30-minute run means the machine is productive only 20 percent of the operation — 80 percent is changeover.

This is why setup reduction is a cornerstone of lean manufacturing. The SMED (Single Minute Exchange of Dies) methodology systematically separates internal setup activities (that require the machine to be stopped) from external activities (that can be done while the machine is still running), dramatically reducing changeover time.

Setup Time Example

A CNC machining department tracks setup data over a month:

• Total available hours: 480 (3 machines, 160 hours each)
• Total setup hours: 144 (96 setups averaging 1.5 hours each)
• Total run hours: 288
• Setup percentage: 30%

The department is losing nearly one-third of its capacity to changeovers. A SMED initiative targets the 20 longest setups (averaging 3 hours each). By pre-staging tooling, creating setup sheets with photos, and installing quick-change fixtures, average setup time for these operations drops from 3 hours to 1.25 hours.

Monthly setup hours decrease from 144 to 109 — freeing 35 hours of capacity per month. At a billing rate of $150 per hour, that is $5,250 of recovered capacity monthly, or $63,000 annually, from a one-time setup improvement investment.

Why Setup Time Matters for Production Scheduling

Setup time is a primary driver of scheduling decisions. Schedulers can reduce total setup time by grouping similar jobs together, running them on the same machine with the same tooling before changing over. This setup-aware sequencing can recover 10 to 20 percent of machine capacity in high-mix shops.

Resource Manager DB (RMDB) accounts for setup time in every scheduled operation, ensuring the schedule includes realistic changeover durations. The system can also optimize job sequences to minimize setup time while respecting due date priorities, giving planners the best balance between machine utilization and delivery performance.

Related Terms

• Run Time — The productive processing time that follows setup time in each operation
• Sequencing — The ordering of jobs that can minimize sequence-dependent setup times
• Takt Time — The required production rate that setup time reductions help achieve

Frequently Asked Questions

Learn more in our complete manufacturing glossary or production scheduling guide.