It started with a phone call.
A process engineer at a mid-size contract shop had been staring at the same scrap report for three weeks. Swiss machining cell, tight tolerances, medical components. The scrap rate was sitting at 4.2%. Not catastrophic. Not acceptable either.
He had already ruled out the obvious stuff. Bar stock was consistent. Tooling was fresh. Programs had not changed. The machine was holding position.
So he walked the floor.
What he found was not in the scrap report. It was a folding table shoved against the wall next to the Swiss cell. On it: a laptop with a cracked hinge propped up by a toolbox, a printed setup sheet with handwritten notes scrawled over it, two coffee cups, and a stack of traveler packets that had been there long enough to develop a permanent crease from the edge of the table.
The operator was doing setups from memory because referencing the screen required him to stop, walk two steps, crouch slightly, and squint. So he stopped doing it consistently. Small deviations crept in. Scrap crept up.
The fix was not a new machine. It was not a new program. It was a custom workstation that put the screen at eye level, the documents within reach, and the setup process back where it belonged: in front of the operator while the machine was running.
Scrap dropped to 1.1% in six weeks.
CNC and Swiss machining problems get diagnosed as machine problems, tooling problems, or material problems. Sometimes they are. But a significant percentage of scrap and throughput loss in precision machining traces back to the human interface layer. The point where the operator interacts with information, makes decisions, and executes setup steps.
That layer is almost always an afterthought.
Shops spend $300,000 on a Swiss screw machine and $180 on a wire shelf to hold the controller documentation. They optimize feeds and speeds to three decimal places and then ask an operator to reference a PDF on a monitor mounted sideways on a cart pulled from a different department.
The machine is precise. Everything around it is improvised.
When engineers calculate OEE on a CNC or Swiss cell, they are usually looking at availability, performance, and quality. Legitimate inputs. But they are measuring the machine, not the system around it.
Changeover time is part of throughput. So is setup accuracy. So is the rate at which operators catch and correct deviations before they become scrap.
All three are affected by the work environment. A well-designed custom workstation with the right monitor position, document access, and surface space for setup tools is not an ergonomics project. It is a throughput project.
The shops that understand this stop treating workstations as furniture and start treating them as process equipment. They spec them the same way they spec a tool holder. What is this used for. What does the operator need to access. What position is the operator in when they need it. What fails when this is wrong.
Pezo works with manufacturing and process engineers on Swiss and CNC machining problems because those engineers understand process discipline. They measure things. They chase root cause. They know that a 0.0002" deviation in a part feature does not come from nowhere.
We also build custom workstations because we have seen enough shop floors to know that the workstation sitting next to a precision machine is almost never as precise as the machine itself. And that gap costs real money.
The two are not separate services. They are the same problem viewed from different angles. One is about what the machine does. The other is about what happens around it.
In most shops, fixing one without addressing the other leaves yield on the table.
If you are chasing a scrap or throughput problem on a CNC or Swiss cell and the obvious culprits have already been ruled out, look at the work environment before you call the machine builder. The answer might be closer to the operator than you think.