Economics of Work, Production & Automation
How to tell whether a machine will pay for itself, starting from the full installed cost and the hours it will actually run, and how to check the answer once it is in.
Reading guide
Automation investment is about deciding to spend money on a machine, then checking afterward whether the spending paid off. The six analyses here follow one running case, a $60,000 machine, from the first business case to the review after installation.
Any owner or finance lead will know the questions. Is the project worth doing? What is the real investment figure? How much of the labor saving is cash? How many hours must the machine run? Which level of automation fits the volume? And did the plant get what it planned for?
Count cash, not freed hours. A business case that says a machine “saves 800 hours” has described capacity. It becomes a saving only when payroll or other labor spending actually falls. A payback period built on freed hours that go to other work can look sound and still never show up in the accounts.
The same goes for the investment side. What matters is everything paid to reach normal, accepted production, not the machine invoice. It goes for timing too, since the answer depends on the hours the machine really runs on real orders.
Keep each input visible and separate. Hours are a physical result, savings are a financial result, and a plan stays a hypothesis until the review compares it with measured figures.
Begin with Automation Payback, ROI and TCO. It introduces the running case and shows what payback, ROI and total cost of ownership each measure. The other five articles change one input at a time, so they borrow their vocabulary and baseline from this one.
The path follows the life of a project: define the metrics, fix the investment, test the savings, test the hours, pick the scale, and review the result.
Open with Automation Payback, ROI and TCO if you’re unsure which metric answers which question. The case has a payback of 3.33 years (about 40 months), an ROI of 50% over five years and a five-year TCO of $90,000 against $120,000 for manual work. The three numbers answer different questions, and ROI needs a stated horizon.
Then read The True Installed Cost of Packaging Automation to settle what goes into the investment figure. In its example an $80,000 machine becomes a $117,500 project, and payback moves from 40 months to about 59 months. It leaves you with a six-group cost list and a way to read a quote.
Next, Labor Savings Versus Redeployment is the one to read when the case rests on freed hours. The same 800 hours produce a 40-month payback, no payback, or a 60-month payback, depending on what happens to the people and the spending. You come away with a separate labor line and a checklist for keeping it honest.
After that comes How Equipment Utilization Changes Automation Payback, which asks how many productive hours the project needs. The same $60,000 investment pays back in 80 months at 1,000 hours a year and in 16 months at 4,000. It includes a break-even utilization calculation and a sensitivity check.
Once the case holds up, Manual, Semi-Automatic or Fully Automatic Packaging? helps you choose the level of automation. In the example, manual is cheapest up to 200,000 packs a year, semi-automatic up to 1,000,000, and fully automatic above that. It gives a crossover method and a list of factors the model doesn’t price.
Finish with The 90-Day Post-Installation Review once the machine is running, to see whether it delivers what the case assumed. In the example, actual figures stretch a 40-month payback to 80 months, and fixing the hours shortens it to 59. It includes a review table and a way to separate one-off problems from structural ones.
When the cash flows change by year—with progress deposits, Q1 ramp-up scrap, a mid-life rebuild, or MACRS tax depreciation—move to Build a Multi-Year Equipment Cash-Flow Model in Excel and ROI Calculation in Excel: Simple ROI, Discounted Payback, NPV, XNPV, IRR, and MIRR for Equipment CapEx.
The cost lines in every case here come from operating data. Cost per Good Pack shows how to build the baseline that savings are measured against, and Measuring the Cost of Unplanned Production Downtime shows how to value downtime savings without counting them at selling price.
If the machine is imported, the investment figure grows again. Imported Equipment Costs Beyond the Factory Price lists freight, duties, installation and service, and Comparing Packaging Machinery Quotes shows how to put competing offers on one scope. The Production Economics and Trade and Supply Chains guides cover the neighboring paths.
The payback examples here run on round, labeled example numbers rather than quotes, benchmarks or customer results. The models leave out taxes, financing and the time value of money, so use them to compare options, and get proper financial and engineering advice before you commit.
Compare simple ROI calculation in Excel against NPV, XNPV, IRR, XIRR, and MIRR formulas when equipment CapEx has milestone deposits, Q1 ramp-up scrap, and a Year 5 overhaul.
A five-year Excel sheet for equipment cash that changes by year, with a negative overhaul year, cumulative recovery, and NPV.
A review template that compares an automation business case with 90 days of actual results, recalculates payback, and records lessons for the next investment.
A volume-based cost model that puts manual, semi-automatic and fully automatic packaging on one basis, with the crossover volumes worked out and checked.
Payback, ROI and TCO answer three different questions. One worked automation case run through all three, with what each metric leaves out.
Low, medium and high utilization scenarios for one $60,000 automation case, with a sensitivity check and a break-even hours formula.
A checklist of the costs beyond a packaging machine's price, a worked installed-cost example, and how to get suppliers to state scope and exclusions.
How to separate cash labor savings from freed hours in an automation business case, so a payback claim does not count wages the company will still pay.
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