Quality Assurance

At TDC, we possess world-class measurement environments and evaluation technologies, enabling us to meet our customers’ quality requirements with ultra-precise manufacturing.

During our ultra-precision processing, we continuously measure surface roughness, flatness, parallelism, dimensional tolerances, and dimensions using precision measuring instruments. We also provide measurement data that guarantees quality at the time of shipment, ensuring you can trust us with your orders.

For more information about the measurement instruments we use, please visit the “Measurement Equipment” page.

A Measurement Environment That Ensures Ultra-High Precision Manufacturing at All Times

Measurement Rooms Unaffected by External Factors

Maintaining high quality requires facilities that are not influenced by external factors such as temperature and humidity. At TDC, we have multiple measurement rooms that are air-conditioned to maintain consistent temperature and humidity throughout the year. In our most advanced measurement rooms, the air is controlled at two levels—both inside and outside the facility—enabling us to achieve even greater precision.

Database-Driven Process Standardization for Reproducibility

What was once considered artisan craftsmanship in high-precision processing is now fully digitized at TDC. We log all processing history as data to ensure consistent quality regardless of conditions. This prevents skills from becoming reliant on specific individuals and ensures that every technician can deliver ultra-precise manufacturing. As a result, we can produce multiple products with stringent accuracy requirements, all at consistent quality.

Additionally, if the same order is placed after some time, we can replicate the quality from the previous production. This makes our services ideal not only for precision products but also for applications in experiments and research.

Dual Inspection During Processing and Before Shipment

At TDC, all products are measured by technicians during processing and then re-measured by shipping staff before delivery. This dual inspection system ensures quality control, allowing us to deliver products that meet the precise specifications you require.

Inspection Quantity

TDC uses reliable measurement equipment’s and encloses inspection data at the time of delivery.

Parallelism・Flatness・Perpendicularity・Size・Roundness・ Cylindricity

Production Quantity	Inspection Quantity
less than 10 pcs	20%
10 pcs or more	10%
100 pcs or more	5%

※ We basically measure all products with <±0.002mm.

Surface Roughness

One Sample Per Lot for Inspection

We can provide pre-processing measurement data or measurements for a specified quantity based on your needs.
Additionally, we are happy to accept requests for measurement services only.