How Realistic Handoff Time Keeps Promise Dates Honest

A job spends real hours between operations, waiting in a queue, being moved, riding a truck to an outside process, and a promise date is only honest when the plan counts them. EDGEBIC by User Solutions adds queue time, move time, and transit days after each operation, so the date you give the customer reflects the whole journey, not just the sum of the machine hours. Optimism gets removed at the source.

This post explains where the between-operation hours come from, how they enter the schedule in order, and how to attack them once they are visible. For the metric behind it, see what is production scheduling. This post sits under the EDGEBIC results guide.

Why Run Time Is Not Lead Time

Add up the machine hours on a routing and you get run time. Ask the floor how long the job actually takes and you get something much longer. The difference is the time the part is not on a machine at all, and in most job shops that is the majority of the elapsed clock.

A part finishes machining and does not appear at the deburr station instantly. It sits in a queue until deburr is free. Someone moves it across the department. If a step goes to an outside plater, the part rides a truck out and back. None of that is run time, all of it is real, and a plan that counts only run time promises a date that only run time could hit.

The result is the familiar pattern: the hours say five days, the floor says nine, and every promise is short by the four days nobody scheduled.

The Three Kinds of Handoff Time

EDGEBIC models the between-operation clock as three distinct, composable elements, each added after an operation finishes:

1. Queue time. A shift-aware buffer representing the normal wait before the next station picks the job up. Because it is measured against the work center's shifts, a queue that crosses a night or a weekend places the successor on the next working time rather than in the middle of a closed shift.
2. Move time. The handling delay to physically transport the part to the next operation, a flat allowance for the walk, the forklift, the stage-and-restage.
3. Transit days. A larger, calendar-based delay for shipping work to another building or an outside process, measured in calendar or working days depending on how you set it.

These are not alternatives; they stack. The engine applies them in a fixed order after the operation's end time: queue first, then any overlap handling, then transit. A step that has all three carries all three, and the successor cannot start until the last of them clears.

A Worked Handoff

Consider a three-operation routing where the run time is modest but the handoffs are not:

The run time totals 16 hours, under two shifts. The elapsed time is six working days, almost all of it handoff. A plan that promised two days would be four days late, every time, and the lateness would look like a floor failure when it was really a planning omission. Counting the handoffs turns a chronic four-day miss into a six-day promise the plant actually keeps.

Honest, Then Shorter

Making the promise honest is the first job. Making it shorter is the second, and the order matters: you cannot cut a handoff you are not measuring.

Once queue and transit are in the plan, they become targets. A queue that is longer than the station's real backlog is slack you can trim. And where operations can overlap, lot streaming lets a downstream step start on a transfer batch before the upstream step finishes the whole lot, which attacks the elapsed time directly rather than pretending the handoff is not there. See how overlapping operations shorten delivery for that mechanism.

The sequence is the point. Optimistic scheduling shortens the promise by hiding the handoff and pays for it in late shipments. Honest scheduling shows the handoff, then shortens it with real changes to how work moves. One is a paper trick that fails on the floor. The other is a genuine improvement the customer feels.

The Anomaly Check Behind It

Handoff settings interact, and one interaction is easy to misconfigure: a step with both an overlap rule and a queue can produce a successor start you did not intend. EDGEBIC's anomaly report flags rows where an overlap and a queue are both set on the same operation, so the planner can confirm the intent rather than ship a plan built on a surprising combination. See how the anomaly report keeps a bad schedule off the floor. The point is not that the combination is wrong; it is that a combination worth a second look gets one.

The Honest Limits

The software cannot know a handoff you never entered. Queue, move, and transit are as accurate as the values on the routing. A four-day ship-out that is not recorded is a four-day surprise the plan cannot see.

A shorter handoff is a floor change, not a setting. Reducing a queue from a day to an hour means the station genuinely picks jobs up faster. Typing a smaller number without changing how work moves just recreates the optimistic promise you were trying to escape.

Transit to an outside process depends on the outside process. The plan can hold four days for the coater, but the coater's actual turnaround is theirs, not yours. Model the transit you can rely on, and treat a vendor who varies as the variability it is.

Honest is not always what sales wants to hear. When the realistic date is further out than the customer wants, the answer is a real decision about overlap, expediting, or the promise itself. The plan makes the trade-off visible. It does not make it disappear.

Want to see where your elapsed time actually goes? Bring one long-running routing to a demo, and we will separate the run time from the handoff time and show you which days are real work and which are waiting.