Are you tired of working with a CNC machining supplier that promises quality but consistently falls short? It can be frustrating and time-consuming to find a reliable replacement. The truth is, most manufacturers will claim they deliver high-quality parts—but how do you know which ones truly mean it?
In this post, I’ll walk you through the key factors to consider when evaluating potential CNC machining partners. These insights are based on real-world experience and are designed to help you make informed decisions.
**A true commitment to quality: Quality standard metrics**
One of the best ways to gauge a manufacturer’s dedication to quality is by asking about their quality performance metrics. What are they tracking, and how are they doing? Common metrics include:
- **DPPM (Defective Parts Per Million)**: Measures the number of defective units produced per million parts. Lower DPPM means better consistency.
- **DPMO/NPMO (Defects or Nonconformities Per Million Opportunities)**: Evaluates the overall effectiveness of the manufacturing process in preventing defects.
- **NCRs (Non-Conformance Reports)**: Document any deviations from specifications. A good supplier should have clear, detailed NCRs to show continuous improvement.
These numbers aren’t just numbers—they’re indicators of a company’s reliability and attention to detail.
**Accreditations and certifications**
Certifications like **ISO 9001** are a solid starting point. They show that a company has documented processes and traceability. But don’t stop there—look for industry-specific standards too. For example, **AS9100** is common in aerospace and reflects a higher level of precision and control.
However, not all companies may hold every certification, so it’s important not to rule out a supplier solely based on that. Instead, focus on what they *can* demonstrate.
**Ship-to-stock status**
If a supplier has **ship-to-stock** status with a customer, it means that customer trusts them enough not to inspect the parts before putting them into production. This is a strong indicator of consistent quality and reliability.
It doesn’t mean you shouldn’t inspect the parts at first, but knowing that other customers trust them is reassuring.
**Robust and repeatable processes**
Consistency is key in CNC machining. A supplier must have well-documented, repeatable processes. Here are some areas to check:
- **Setup procedures**: Ensure the initial part meets specs and that the setup is thoroughly documented.
- **File saving procedures**: Properly saved programs allow for quick reproduction of parts without rework.
- **Machine maintenance**: Regular upkeep ensures accuracy and reduces downtime.
- **Equipment calibration**: Calibrated tools and instruments are essential for precision.
- **Quality inspection process**: A thorough inspection at each stage of production helps prevent errors.
At Penta, we have a documented customer service process called “Penta’s Proven Process†to ensure smooth communication and order management.
**Communication is crucial**
While it might not seem directly related to quality, poor communication can lead to misunderstandings and subpar results. Look for a supplier that communicates clearly throughout the entire process:
- At **quoting stage**: Ask questions and clarify anything unclear.
- When **preparing the order**: Make sure both sides understand the component's form, fit, and function.
- During **production**: Expect regular updates and timely notifications.
- When **issues arise**: A good supplier will inform you immediately and work with you to resolve the problem.
If a supplier seems unprepared to discuss communication, that’s a red flag.
**Why choose Penta?**
Penta Precision is an ISO 9001:2015 accredited CNC machining company based in the UK. We pride ourselves on delivering exceptional and consistent quality, with a 99.8% quality standard. We also have ship-to-stock status with an international CAA-approved aerospace manufacturer.
We believe in transparency and open dialogue. If you're looking for a no-nonsense approach to quality, give us a call at **023 9266 8334**. Let’s talk about your needs and how we can help you achieve the quality you deserve.
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