Production ramp-up planning: yield and rate gates on a Gantt chart
Plan a production ramp-up from first article to rated output: turn yield and rate targets into gates, and put staffing, supplier volume and quality holds on the same Gantt timeline with real dependencies.
A ramp-up plan has to answer one question: when is it safe to go to the next rate? This guide shows how to turn yield and rate targets into gates and how to plan the staffing, supply and quality work that each gate depends on.
The short version
- Draw the ramp as steps, and make each step depend on a gate milestone.
- Write the yield and rate criteria in the notes of the gate, and keep the measured results in your quality records.
- Start staffing and supplier volume work during the previous step, because their lead times do not shrink when the line is ready.
- Give quality holds their own task and length, not an assumption of zero.
- A schedule shows when you intend to meet a gate; it does not make the gate pass.
A ramp is a staircase, not a slope
Ramp-up plans are often drawn as a slope: low output in week one, full output in week twelve. Real ramps are staircases. The line runs at one rate until something shows that it can run at the next, and that something is usually a yield figure, a rate figure or a clean inspection. If the plan does not contain those gates, the dates in it are hopes, and the first quality hold turns the whole slope into an apology.
The method is to make each step up depend on a gate and each gate depend on the work that proves it. Write the gate as a milestone, which is a task of zero length, and write the criterion in its notes: the yield you need over how many units, the rate you need over how many shifts. Then ask what else has to be ready before the next step. A second shift needs people hired and trained. A higher rate needs suppliers to deliver more. Those have lead times that do not depend on the line, so they have to start while the earlier step is still running.
Plan quality holds as time, not as exceptions. After the first articles there is almost always a round of findings, and the plan needs a task for reviewing them and fixing causes, or the approval date is a guess. A schedule cannot make a gate pass. It shows when you intend to reach each gate and which date moves when one is missed. The measured yield, rate and inspection results belong in your quality records.
The example below builds the production ramp-up template in stages. For the process behind the ramp see /templates/new-product-introduction-process and /templates/first-article-inspection-process, and for the wider product programme see /templates/new-product-introduction-gantt.
A production ramp-up, built in stages
Nineteen tasks in four phases. Durations are illustrative; set your own. Open the spreadsheet panel to see the rows behind each stage.
Readiness work runs side by side
After "Freeze line layout and process flow" (5 working days), "Qualify critical suppliers" (8), "Install and debug the line" (10) and "Recruit line operators" (8) run in parallel. "Train operators on the line" follows the recruiting and starts 5 days into the install.
First articles and the first gate
"First article build" (3 days) needs the line and the suppliers. "First article inspection" finishes one day after the build does. "Review quality holds and fix causes" (5) leads to the "First article approved" milestone.
Gates and the work that feeds them
"Pilot run at low rate" (5 days) is followed by the "Yield gate met" milestone. "Staff the second shift" and "Confirm supplier volume for full rate" start 2 and 1 days into the pilot. "Ramp to full rate" waits for half rate, staffing and supply, then "Rate gate met".
Steady state and handover
"Run at rated output" takes 10 working days. "Close open quality holds" (5) is finish-to-finish with it, so both end together, and "Hand over to operations" (3) follows. With these illustrative lengths the whole ramp is 60 working days.
How it works
List the steps up in rate
Write the rates you plan to run at, for example pilot, half and full, as tasks. Each is a block of time at that rate, long enough to show that it holds.
Add a gate before each step
Add a milestone before every step up, such as Yield gate met. Put the criterion, the units or shifts it is measured over and who decides, in its notes. The next step depends on the milestone.
Find what each step needs
Ask of every step: people, parts, tooling, approvals. A second shift needs hiring and training, higher volume needs the supplier to have confirmed it. Make those tasks, with their own lengths.
Start the lead-time work early
Link staffing and supplier tasks start-to-start with the pilot, for example 10SS+2. They run while the line proves itself and they are ready when the gate is met.
Plan quality holds as tasks
After first articles, and after any step where findings are likely, add a review-and-fix task and make the next gate depend on it. Put the open items you expect in the notes.
Read the critical path and share
Switch on the critical path in the View menu to see which chain sets the handover date. Share the chart with operations, quality and purchasing, and export a PDF for the ramp review.
Mistakes to avoid
Dating the ramp without gates
A plan with only dates has nothing to say when the yield is short. Put a milestone in front of each step so that a missed gate shows which later dates move.
Starting staffing when the line is ready
Recruiting and training take weeks that the line cannot shorten. If the second shift starts after the yield gate, the rate step waits for it. Start these tasks during the previous step.
Assuming suppliers will keep up
Parts that were enough for first articles may not be at full rate. Add a task to confirm volume with the critical suppliers and make the rate step depend on it.
Treating the plan as a baseline
QueryChart does not keep an original plan to compare against. If you need to show how the ramp dates changed, export a PDF before you change them.
Open the production ramp-up Gantt chart
Open the production ramp-up template, change the durations to yours and see the rate gate and the handover date move.
Related guides
Frequently asked questions
How do I set the yield and rate targets in the chart?
Put them in the notes of the gate milestones, with how they are measured. The chart does not calculate or check them. It schedules the work that leads to the gate and shows what depends on it.
Can I ramp in more than three steps?
Yes. Add a task and a gate for each step, and link each step to the gate before it. Keep each step long enough to show that the rate holds.
Can the plan start from a fixed launch date?
You can give a task a fixed Start where a date is genuinely fixed, such as a customer's first delivery. If the work before it cannot finish in time, the chart flags the conflict and names the earliest date. To relate the plan to a deadline, compare the finish date with the date you need.
Where is the process behind the ramp?
In the flowchart templates: the new product introduction process at /templates/new-product-introduction-process, first article inspection at /templates/first-article-inspection-process and the engineering to production handoff at /templates/engineering-to-production-handoff-process.
