Geometry
Dimensions, shape, runout, clearance.
Production System
From raw blank to finished batch — one managed process.
Manufacturing a bearing is a sequence of interconnected operations. An error at an early stage cannot be fully offset by later processing.
That is why OID's production system is built around checkpoints: material, geometry, heat treatment, working surfaces, assembly, and final acceptance are checked throughout the process, not only after the finished product is made.
On this page
Nine production stages
Not nine separate operations. One technological chain.
01
Material and blank
Quality begins before machining.
At this stage, the ring blank is formed and the material is confirmed suitable for further production.
Checked
- material compliance with technical requirements;
- chemical composition;
- hardness;
- structural condition;
- absence of unacceptable initial defects.
Stage outcome
a blank cleared for further processing.
02
Machining
We shape the foundation of future geometry.
Turning and other operations form the mounting surfaces, faces, grooves, and preliminary raceway geometry.
At this stage, it is important to ensure the necessary machining allowance and geometric stability for the subsequent heat treatment and grinding.
Checked
- basic dimensions;
- concentricity;
- shape of mounting surfaces;
- face geometry;
- machining allowances.
03
Heat treatment
Material structure must match the load.
Depending on the design, through-hardening or surface hardening is applied, followed by stabilizing treatment.
The purpose of this stage is to form the required properties in the working zones and ensure the part's stability before final grinding.
Checked
- hardness;
- material structure;
- hardened-layer depth — where applicable;
- process stability;
- compliance with the process protocol.
OID records heat-treatment parameters and logs them by batch.
04
Precision grinding
This is where the bearing's working geometry is formed.
After heat treatment, final machining covers
- raceways;
- mounting diameters;
- end faces;
- guiding and functional elements.
Critical parameters
| Parameter | Why it matters |
|---|---|
| Ovality | Affects load distribution |
| Taper | Affects the fit and position of the ring |
| Runout | Affects rotational stability |
| Raceway profile | Determines the nature of contact |
| Mounting size | Determines interaction with the shaft and housing |
05
Finishing of working surfaces
Geometry is formed. Now the surface matters.
For designs where the operating mode requires it, additional finishing of the raceways is applied.
Its purpose is to achieve the required contact-surface condition and ensure stable operation in the intended mode.
The required roughness and finishing technology are determined by the design and technical requirements of the specific product.
06
Cages and components
A bearing is assembled from components that must work as a single system.
OID uses various cage and component designs depending on the bearing's construction, speed, load, and temperature.
07
Assembly
Individual parts become a bearing.
At the assembly stage, it is no longer enough for each part to individually conform to its drawing.
The performance of the whole system is checked
- completeness;
- internal clearance;
- preload — where applied;
- rotation quality;
- cage condition;
- position of the rolling elements;
- seals and protective elements;
- absence of interference.
08
Final acceptance
The finished product is inspected as a complete system.
Final acceptance brings together the results of the previous stages and confirms that the batch meets the established requirements.
What inspection may include
Surfaces
Condition of the raceways and functional surfaces.
Rotation
Smoothness, noise, and applicable vibration parameters.
Material
Confirmation of heat-treatment results.
Non-destructive testing
For products and batches where it is required by technical specifications.
Documentation
Recording inspection results and batch data.
09
Packaging and batch release
The production cycle doesn't end after the last measurement.
After acceptance, the product is prepared for storage and transport.
The required accompanying documentation is prepared for the batch, and protective packaging is applied according to the type and size of the product.
At this stage, it is important to preserve the condition confirmed by production control until the product reaches the customer.
Checkpoints
| Stage | What is confirmed |
|---|---|
| Material | Suitability of the raw material |
| After machining | Geometric foundation |
| After heat treatment | Hardness and structure |
| After grinding | Working geometry |
| After assembly | Clearance and functionality |
| Final acceptance | Compliance of the finished product |
| Before shipment | Completeness and documentation |
Critical operations managed by OID
Heat treatment
Shapes the material properties of the working surfaces.
Precision geometry
Determines contact, fit, and rotational stability.
Finishing of working surfaces
Determines the condition of the contact zone in the required designs.
Assembly
Shapes the internal condition of the finished bearing.
Controlled cooperation
For some components and special groups, OID works with qualified production partners operating under agreed drawings, requirements, and OID's acceptance procedures.
Standard and special products
One process — different starting requirements.
Standard series
- 01Catalog design
- 02Approved specification
- 03Standard production route
- 04Batch inspection
- 05Shipment
Special design
- 01Technical specification
- 02Drawing / design
- 03Material and technology
- 04Control parameters
- 05Manufacturing
- 06Acceptance
Large-size products — a separate technological challenge
The larger the ring, the higher the cost of a geometric error.
As diameter increases, the following become more significant
- ring deformation;
- heat-treatment stability;
- raceway accuracy;
- positioning during grinding;
- assembly clearance;
- transport and storage.
That is why large-size designs require a separate production route and inspection program.
500–1600 mm
Confirmed mounting-diameter range for large-size projects.
Up to Ø1000 mm
Production capability for corresponding cage designs.
By technical specification
Material, geometry, design, and inspection program are agreed for the specific product.
What the customer can agree before production
For a special order, the following can be agreed
- design configuration;
- material;
- internal clearance;
- precision class;
- cage;
- heat treatment;
- working-surface requirements;
- inspection program;
- documentation package;
- packaging and marking.
Batch traceability
Depending on the order requirements, production documentation can link:
- 01Product
- 02Batch
- 03Inspection results
- 04Accompanying documents
- 05Shipment
For critical projects, the documentation package is agreed before the batch is started.