Milk Run
A milk run is a scheduled internal logistics tour that visits a set of stations or buffers on a repeating path. In most plants it is run by a [tugger](https://www.twinzo.com/glossary/tugger) pulling several trolleys or carts, not by a one-pallet [forklift](https://www.twinzo.com/glossary/forklift) hop. Planners size stops, loads, and intervals from theoretical or standard consumption. That tour is the backbone for steady supermarket feed.
Milk-run orders are usually multi-stage. Machines or stations fire need into a [supermarket](https://www.twinzo.com/glossary/supermarket). Staff prepare trolleys. Then the tugger driver delivers the prepared train on the loop. That is not the same as a direct station-to-forklift [material call-off](https://www.twinzo.com/glossary/material-call-off) for a pallet-size bring or empty remove. The distinction is under [milk-run orders vs direct forklift orders](https://www.twinzo.com/glossary/milk-run-orders-vs-direct-forklift-orders).
On the floor, consuming faster than the milk run is hard unless material is defective or the plan was wrong. Consuming slower is common. Then the planned tour still rolls with partial need, or tugger capacity sits while another line needs a forklift hop now. twinzo [AOS](https://www.twinzo.com/glossary/aos-automated-ordering-system) (commonly known as [FGS](https://www.twinzo.com/glossary/forklift-guidance-system)) does not replace every milk run. It can stage supermarket prep and tugger delivery as claimable [work orders](https://www.twinzo.com/glossary/work-order), and let freed capacity answer real pull across lines. How that management case works is under [milk runs on theoretical consumption vs dynamic pull across lines](https://www.twinzo.com/wiki/milk-runs-on-theoretical-consumption-vs-dynamic-pull-across-lines).
## Key Components
**Route and stops**: The planned sequence of stations or buffers.
**Tugger and trolleys**: The usual vehicle and multi-cart load unit for the loop.
**Supermarket prep stage**: Building trolley loads before delivery starts.
**Theoretical consumption**: The rate used to size how much to bring each lap.
**Exception pull**: Direct forklift or other ad-hoc call-offs when live need diverges from the tour.
## Applications in Manufacturing and Logistics
Assembly supply uses milk runs for steady KLT and tote feed. Supermarkets use them for replenishment waves. Continuous improvement compares planned laps to measured paths and idle time when movers are tracked.
## Benefits and Challenges
Milk runs give predictable baseline coverage with high parts density per trip. The challenge is staffing the loop for peak theoretical need while average real need is lower, and keeping supermarket prep visible as its own stage. Dynamic forklift pull across lines is how plants reclaim tugger slack without treating every job as a pallet hop.
## Related Terms
[tugger](https://www.twinzo.com/glossary/tugger), [supermarket](https://www.twinzo.com/glossary/supermarket), [milk-run orders vs direct forklift orders](https://www.twinzo.com/glossary/milk-run-orders-vs-direct-forklift-orders), [material call-off](https://www.twinzo.com/glossary/material-call-off), [e-Kanban](https://www.twinzo.com/glossary/e-kanban), [AOS](https://www.twinzo.com/glossary/aos-automated-ordering-system), [kanban](https://www.twinzo.com/glossary/kanban).
## Frequently Asked Questions
**Does AOS delete milk runs?** No. Milk runs stay the planned tugger backbone. AOS handles staged prep and delivery, plus pull when live consumption diverges.
**Why not just shrink the milk run?** Shrinking for average need risks true peak and defect spikes. Dynamic claim across forklift groups uses spare capacity without permanently under-sizing the route.
**Is faster-than-plan consumption common?** Rare in steady operations unless quality scrap or a bad plan forces extra demand.
**Do forklifts run milk runs?** Sometimes on sparse loops. The usual pattern is still a tugger with multiple trolleys and a supermarket prep stage.