Jig Grinding / Coordinate Grinding

Manufacturing

Cylindrical Grinding

Flat grinding

Jig grinding

Milling

Turning

Wire erosion

Ultra-Precision Jig Grinding for Tight Tolerances and True Position Accuracy

Jig grinding, also referred to as coordinate grinding, is a high-precision machining process used to achieve exceptional dimensional accuracy, true position, and form consistency. At Precisium, jig grinding is applied where conventional machining methods such as milling or turning reach their limits — particularly for tool inserts, gauges, fixtures, and function-critical bores.

Using CNC Hauser and CNC Moore jig grinding machines, we deliver stable and repeatable results for demanding applications, achieving tolerances down to ±1 µm.

What Is Jig Grinding?

Jig grinding is a specialized precision grinding process used to finish complex and detailed parts with extremely tight tolerances, precise hole locations, and high-quality surface finishes. It is typically employed when part requirements exceed the achievable accuracy of standard machining processes and when form accuracy and positional precision are critical to function.

When to Use Jig Grinding

Jig grinding is the preferred solution when components require:

Micron-level tolerances on diameters and geometry
Exact positional accuracy between multiple features (true position)
Final finishing after EDM or heat treatment
Reliable fit and function in precision assemblies
Consistent quality for single high-value parts or small series

Typical applications include tooling inserts for plastic injection moulds, precision gauges, fixtures, and machine components where geometry directly influences performance and service life.

Our Jig Grinding Capabilities

We provide coordinate grinding for a wide range of high-precision components, including:

High-precision internal bores and functional holes
Coordinate-critical hole patterns
Finishing of hardened components
Corrections and fine-tuning after milling or EDM

Tool inserts for plastic injection moulds

Typical Applications of Jig Grinding

Jig grinding at Precisium is commonly used for:

Ring gauges and setting rings – ensuring dimensional accuracy and for setting internal micrometers
Oval and non-cylindrical plug gauges (slot gauges) – for measuring nuts, slots, and complex internal features
Positional holes for guide plates in fine-stamping tools – ensuring exact alignment and functional reliability
Positional holes in parts for control fixtures – critical for assembly accuracy and quality control
Toleranced bores in machine components – enabling precise fit and long-term functional stability

These applications typically require a combination of tight tolerances, precise positioning, and repeatable quality.

Form Grinding and Complex Geometries

In addition to precision bores and coordinate-critical features, our CNC jig grinding machines enable the grinding of defined forms and complex geometries, depending on functional and inspection requirements.

Using CNC-controlled motion and suitable tooling, we perform:

Oval and non-cylindrical gauge pins
Profiled and curved knife geometries, including functional radii and transitions
Grinding of custom contours where form accuracy directly affects function

This capability allows us to manufacture special gauges, control pins, and tooling components that cannot be produced using conventional cylindrical grinding. Shape accuracy and repeatability are ensured through controlled processes and appropriate measurement strategies.

Technical Parameters

Maximum diameter: up to Ø 500 mm
Achievable tolerances: down to ±1 µm
Surface roughness: Ra ≤ 0.8 µm
Machines: CNC Hauser, CNC Moore

Measurement, Quality and Documentation

Quality assurance is an integral part of our jig grinding process:

Measurement of critical dimensions before and after machining
Inspection reports provided upon request
Full traceability for quality and metrology departments
Processes aligned with ISO 9001 requirements

This makes our jig grinding suitable for validated processes and demanding industrial quality environments.

Our Process

Our jig grinding process is structured to ensure precision, process stability, and traceability:

Review of drawings, tolerances, and functional requirements
Evaluation of part function, critical features, and tolerance-relevant characteristics.
Technology selection and process planning
Definition of the optimal machining strategy based on material, geometry, and required accuracy.
Precision jig grinding with in-process control
Machining on CNC jig grinding machines using controlled and stable process parameters.
Final inspection and documentation
Measurement of relevant characteristics and preparation of inspection reports upon request.
Delivery and support for follow-up iterations
Reliable delivery and technical support for adjustments or subsequent production steps.

Industries and Target Users

Our jig grinding services are tailored for:

Quality and Metrology departments
R&D and Technology teams
Production and Manufacturing engineers
Purchasing teams seeking a reliable precision partner

Request a Quote

Send us your drawing, tolerance requirements, and material specification.
We will review your application and propose the optimal machining solution.

Frequently Asked Questions (FAQ)

1. What tolerances can you achieve with jig grinding?

We achieve tolerances down to ±0.001 mm, depending on geometry, material, and functional requirements. Typical serial tolerances are ±0.003 mm, optimised for prototypes and small batches.

2. What batch sizes do you support?

We specialise in single parts, prototypes, and small production series up to approximately 20 pieces. Our processes are designed for flexibility and technical accuracy rather than high-volume production.

3. What surface quality can be achieved?

Typical surface roughness values of Ra 0.8 µm can be achieved in serial production when required. Our grinding processes are suitable for functional surfaces, including sliding, sealing, bearing, and gauge surfaces.

4. Which materials can you grind?

We regularly grind:

tool steels
stainless steels
hardened steels above 60 HRC
engineering and heat-treated steels
hartmetal

5. When is jig grinding preferable to milling or EDM?

Jig grinding is preferred when micron-level tolerances, high form accuracy, or precise feature positioning are required—especially for hardened parts or as a finishing step after EDM.

6. How is quality ensured during and after grinding?

Quality is ensured through:

controlled grinding processes
final inspection using in-house manufactured gauges
functional matching between components and gauges where required
All processes are supported by our ISO 9001 certified quality management system.

7. Which industries do you typically work with?

We support customers in:

medical technology
automotive and e-mobility
automation and machinery
pharmaceutical equipment
tooling and precision gauge manufacturing

Our services are tailored to applications where precision and reliability are critical.

8. Can you support technically demanding or non-standard components?

Yes. We are often chosen for technically demanding components that require tight tolerances, functional surfaces, or close cooperation between machining and metrology. If standard grinding suppliers are not a good fit, we are usually able to help.

9. Do you support customers across Europe?

Yes. We work with customers across Northern, Western, Eastern, and Central Europe, supplying precision components for technically demanding applications. Our experience includes collaboration with international engineering teams and quality departments across the European Union.