The Real Challenge Was Not the Hole—It Was the Assembly Fit
This precision metal stamping component is used in printing equipment for a well-known overseas brand. It is made from T1.2 mm galvanized steel.
The critical requirement was not simply hole size or profile accuracy. After bending, the round hole and profiled hole on opposite sides of the formed part had to maintain concentricity within 0.05 mm.
The part also includes four M2 threaded holes. Every thread had to be complete, correctly located and ready for assembly without rework.
For bent galvanized steel stampings, hole position, forming springback and datum transfer can all affect final assembly fit. A part may pass individual dimensional checks but still fail when installed if the relationship between the two sides is not controlled.
Key Project Controls
| Control Item | Requirement / Solution |
|---|---|
| Material | Galvanized steel, T1.2 mm |
| Critical Feature | Concentricity between round and profiled holes after bending |
| Accuracy Requirement | 0.05 mm |
| Threaded Holes | 4 × M2 threads per part |
| Tapping Method | Custom multi-spindle tapping machine, four holes tapped simultaneously |
| Quality Control | 100% inspection using a dedicated checking fixture |
| Inspection Coverage | Three critical dimensions checked on every part |
Tooling Design Built Around a Common Datum Strategy
The challenge was not punching individual holes. It was maintaining the correct relationship between those holes after the part was formed.
During tooling development, we reviewed the punching, locating and forming stages as one connected process. The tool design was optimized around a common datum strategy, allowing the round hole, profiled feature and bend geometry to be controlled from the same functional reference.
The goal was repeatability. Instead of relying on adjustment during production, the process was designed to keep the formed hole relationship stable from part to part.
Four M2 Threads in One Setup
A conventional single-spindle tapping process requires repeated loading and repositioning. That increases handling time and creates more opportunities for missed threads, incomplete tapping or inconsistency between holes.
We developed a dedicated multi-spindle tapping station that completes all four M2 threads in one clamping cycle.
This approach improves process control in two practical ways:
- All four threads are produced together, reducing the risk of missed tapping.
- One locating setup supports better thread position consistency and a more stable production rhythm.
For the customer, this removes the need to question whether every threaded hole has been completed before assembly.
100% Inspection Before Packing
Tight tolerances cannot be protected by first-piece approval or sampling alone.
A dedicated checking fixture was developed for this project to inspect three critical dimensions on every part, including the customer’s 0.05 mm concentricity requirement.
Each component is checked before packaging. The purpose is simple: identify any variation inside our factory, not at the customer’s assembly line.
For precision stamped metal parts, bent sheet metal components and printer hardware assemblies, this level of control is often what separates a part that looks acceptable from one that assembles reliably.
What the Customer Receives
The final objective is not only to supply conforming parts. It is to deliver components that fit consistently, have all threads completed, and can move directly into assembly without additional sorting or rework.
From tooling optimization and precision stamping to synchronized M2 tapping and 100% fixture inspection, the process was built around accuracy, repeatability and error prevention.
For projects involving high-concentricity metal stampings, galvanized steel formed parts, M2 threaded metal components, printer hardware brackets or custom precision sheet metal parts, early tooling and process planning make the difference between a workable sample and stable production.
Watch the complete fabrication and test video: https://youtube.com/shorts/hA8CtwQbtJU?feature=share
