C-Frame CNC Machined Parts for German Automation Equipment Manufacturer

Overview

When manufacturing precision CNC machined parts for industrial automation equipment, dimensional accuracy alone is not enough. Successful projects also depend on transparent communication, effective process control, and the ability to solve problems before they affect production.

This project involved the manufacture of a large CNC machined C-frame for a German automation equipment manufacturer. The component serves as a structural part of an automated machine where multiple machined surfaces and mounting features must align precisely during assembly.

The original drawing specified S355J2+N (1.0570) steel. After technical discussion, the customer approved our proposal to manufacture the parts using mild steel Q355B, which offers comparable mechanical properties while improving material availability and reducing lead time.

The order consisted of 36 pieces, each weighing approximately 145 kg.

The Manufacturing Challenge for the C Frame CNC Machined Part

Although the part appears to be a simple steel frame, it combines fabrication, large-scale CNC machining, precision drilling, threaded holes, and powder coating into a single manufacturing process.

Several machined pockets and elongated slots required excellent positional accuracy, while the large opening in the center meant that controlling deformation during machining was equally important.

To minimize production risk, we followed our standard procedure of manufacturing and inspecting a prototype before releasing the entire batch.

An Issue Found During Prototype Inspection

During dimensional inspection of the prototype, our quality engineers discovered that one threaded hole on the side of the component deviated from its specified position by approximately 1.6 mm.

Although the deviation affected only a single hole, we immediately suspended further production and informed the customer instead of making assumptions.

After reviewing the drawing together with the customer’s engineering team, it became clear that this hole was only used as a temporary lifting point during transportation and installation. It was not involved in the functional assembly of the automation equipment.

Because the issue was identified during the prototype stage, the customer confirmed that the prototype remained acceptable for its intended purpose, avoiding unnecessary scrap and preventing delays to the project schedule.

Process Improvement Before Mass Production

Rather than treating the issue as an isolated event, our engineering team reviewed the machining program, workholding method, and inspection sequence to determine why the deviation had occurred.

Additional dimensional checkpoints were introduced specifically for this feature, and the machining process was adjusted before production of the remaining parts began.

As a result, all 36 production parts were completed without repeating the same issue. Every component passed final inspection and was delivered on schedule.

This experience reinforced an important principle in precision manufacturing: a prototype is not only used to verify the product—it is also used to validate the manufacturing process.

Results

The CNC machined parts were completed successfully, with all finished components delivered to the customer according to schedule.

By identifying a potential issue early, communicating openly with the customer, and improving the manufacturing process before batch production, we avoided costly rework while ensuring consistent quality across the entire order.

For our customer, this meant receiving production-ready components without delays. For our team, it demonstrated the value of combining precision machining with disciplined quality management and proactive engineering communication.

Project Summary

What This Project Demonstrates

Every machining supplier can produce parts from a drawing. The real difference lies in how unexpected situations are handled.

In this project, discovering a 1.6 mm deviation during prototype inspection could have become an expensive problem if it had gone unnoticed until batch production. Instead, early inspection, immediate communication with the customer, and rapid process improvement ensured that the remaining 36 parts were manufactured correctly and delivered on time.

For precision automation components, effective manufacturing is not only about machining accuracy—it is about controlling the entire process from prototype to production.

Contact ArtisanMetal for more details!