Quality inspection

MIM Quality Inspection & CMM Verification Services

Quality is not a final check at Emitech—it is engineered into every step of the MIM process. Metal injection molding produces complex, net-shape components that often serve critical functions in medical devices, automotive sensors, firearms, and consumer electronics. Because these parts are small, intricate, and produced in high volumes, inspection must be fast, repeatable, and statistically reliable. Our MIM manufacturing services rely on a dedicated quality control team, calibrated metrology equipment, and documented traceability for every lot.

This page explains our inspection capabilities, equipment, and quality workflow. Whether you need PPAP Level 3 submissions, density verification, or CMM reports for tight MIM tolerances, our lab delivers the data you need to release parts with confidence.

CMM dimensional verification of a MIM component for tolerance compliance.

Inspection Equipment and Capabilities

Our quality lab is equipped with instruments selected specifically for MIM production. The table below summarizes the equipment we use, what each machine measures, and where it fits in the production cycle.

Each piece of equipment is calibrated on a scheduled basis, and gage R&R studies are performed to confirm measurement system reliability. This is especially important for MIM materials such as 17-4PH, 316L, and titanium, where small density or chemistry variations can affect mechanical performance.

MIM Quality Control Process

Our quality control process is designed to catch deviations early, before value is added to a non-conforming part. The workflow is divided into five stages that parallel production.

By linking each inspection stage to a documented output, we maintain full traceability from raw powder to finished part. This is essential for customers who require PPAP, ISIR, or medical device documentation.

In-process quality checks during MIM production.

Key Testing Services

Emitech offers a comprehensive suite of testing services that support both routine production and new product introduction.

Dimensional Inspection with CMM

Our CMM is the backbone of MIM quality inspection CMM services. It captures thousands of data points per part and compares them directly to the CAD model. Critical dimensions, true position callouts, and profile tolerances are verified automatically, reducing operator variation and improving throughput for high-volume lots.

Density Testing

Density is one of the most important quality indicators for MIM parts. Sintered density typically reaches 95–99% of theoretical, depending on material and process. Low density can signal incomplete sintering, contamination, or incorrect powder loading. We use the Archimedes method for repeatable density measurement and report values against MPIF Standard 35 or customer specifications.

Metallographic and Chemical Analysis

Cross-section samples are polished, etched, and examined under a metallographic microscope to evaluate grain structure, porosity, and inclusion content. An optical emission spectrometer confirms that chemistry matches the selected MIM material grade.

Mechanical and Surface Testing

Hardness testing verifies heat treatment response, while surface roughness measurement documents Ra and Rz values before and after finishing operations. When parts move to CNC machining or surface treatment, these baseline measurements help validate secondary operation quality.

ISO 9001, Traceability, PPAP, and FAI

Our quality management system is built around ISO 9001:2015 principles. This framework drives continuous improvement, risk-based thinking, and customer-focused processes across every department. For customers in automotive and regulated industries, we provide full production part approval process (PPAP) packages including:

• Design records and material certifications
• Dimensional results from CMM and vision systems
• Process flow and PFMEA documentation
• Control plans and capability studies
• Appearance and performance test results
• Part submission warrant (PSW)

First article inspection (FAI) is performed at tool release and after any engineering or process change. Each FAI report includes measured data, material verification, and a signed approval record. Lot traceability is maintained through traveler tags, barcode labels, and electronic records that link each shipment back to raw material batch, machine, operator, and inspection data.

CMM equipment used for dimensional verification and PPAP reporting.

Why Quality Inspection Matters in MIM

Metal injection molding is highly capable, but its success depends on controlling dozens of process variables: powder particle size, binder ratio, injection pressure, debinding atmosphere, sintering temperature profile, and cooling rate. Without robust inspection, small variations can accumulate into dimensional drift, density loss, or cosmetic defects. Our quality system isolates these variables, verifies outputs, and provides the data trail required for high-reliability applications.

We also integrate quality planning into early design reviews. By reviewing wall thickness, gate location, and draft angles before mold steel is cut, we identify inspection challenges and measurement access issues in advance. This design-for-inspection approach reduces downstream rework and ensures that every critical feature can be verified economically in production.

Investing in MIM quality inspection also reduces total cost of ownership. Catching a tooling or process issue during FAI prevents thousands of non-conforming parts later. CMM-based process capability studies (Cpk) help us tune molds and processes so that production remains centered within specification limits, reducing scrap and inspection burden over time.

Process capability Cpk interpretation used to maintain robust MIM production.

Frequently Asked Questions