Surface Grinding
Flat faces, shoulders, plates and datum surfaces
Reviewed per drawingFabrication & Secondary Processes
Precision Grinding Services
Final dimensional and surface control for hardened, machined and function-critical metal parts.
Send the complete drawing so we can review grinding stock, datums, heat-treatment sequence and inspection needs together.
- Final-Size Control
- Hardened Metals
- Inspection Reports Available
When Precision Grinding Is the Right Process
Grinding is typically selected when milling or turning alone cannot reliably deliver the required final size, geometry or contact surface.
- 01
Final Size After Heat Treatment
Recover critical dimensions and functional fits after heat-treatment distortion.
- 02
Flatness & Parallelism
Control reference faces, sealing surfaces, plates and tooling components.
- 03
Roundness & Runout
Finish shafts, journals, bores and bearing locations around the required datum strategy.
- 04
Controlled Surface Finish
Prepare sliding, sealing, locating and contact surfaces to the drawing requirement.
Grinding Routes Selected Around the Feature
Process selection is confirmed from the part geometry, material condition, access, quantity and drawing requirements.
OD Grinding
External diameters, shafts, journals and bearing fits
Reviewed per drawingID Grinding
Precision bores and internal cylindrical features
Reviewed per drawingCenterless Grinding
Straight cylindrical parts reviewed for geometry and quantity
Reviewed per drawingWhat We Review Before Grinding
Reliable grinding starts before the wheel touches the part. The manufacturing sequence must preserve enough stock and a usable datum after heat treatment.
- Final size, tolerance and surface-finish callouts
- Datum relationships, runout and concentricity requirements
- Material grade and heat-treatment condition
- Grinding stock and expected distortion allowance
- Wall thickness, feature access and workholding surfaces
- Quantity, sampling plan and inspection documentation
- Process
- Surface, OD, ID or centerless grinding by review
- Tolerance
- Confirmed from feature geometry and datum relationships
- Surface finish
- Reviewed from the drawing and functional surface
- Material state
- As-machined or heat-treated condition confirmed
- Inspection
- Dimensional and surface reports available on request
How We Manage Precision-Ground Parts
- 01
Drawing Review
Critical grinding surfaces, datums, fits and inspection requirements are identified.
- 02
Allowance Planning
Pre-machining size and stock are planned around heat treatment, distortion and workholding.
- 03
Controlled Grinding
The grinding route, wheel condition, coolant and measurement sequence are matched to the part.
- 04
Final Verification
Drawing-critical size, geometry and surface requirements are checked before release.
Control the Surface Without Losing the Datum
Grinding quality depends on the complete setup—not only the final micrometer reading.
Datum & Workholding
The setup must preserve the relationship between ground features and the drawing datums.
Wheel & Process Selection
Abrasive, wheel condition and grinding route are selected for material, hardness and finish.
Heat Control
Coolant, dressing, passes and spark-out are managed to reduce grinding burn and thermal movement.
Measurement Strategy
Size, flatness, roundness, runout and roughness are verified with methods suited to the callout.
Materials and Parts Commonly Reviewed
Final feasibility depends on hardness, stock condition, geometry, access and the complete drawing.
Materials
- Tool steels and hardened steels
- Stainless steels
- Carbon and alloy steels
- Aluminum alloys
- Copper and brass alloys
- Nickel-based alloys
- Tungsten carbide by review
Typical Parts
- Shafts, journals and bearing fits
- Precision bushings and sleeves
- Tooling plates and reference faces
- Mold inserts and hardened components
- Gauges and inspection fixtures
- Spacers, washers and thin plates
- Machine components with critical fits
Precision Grinding FAQs
Direct answers about sequence, tolerances, finish and inspection.
When should precision grinding be used after heat treatment?
Grinding is commonly planned after heat treatment when critical dimensions, bearing fits, flatness, roundness, runout or surface finish must be recovered after distortion. The required stock allowance should be reviewed before pre-machining.
What grinding tolerance can OUJI achieve?
Capability depends on feature size, geometry, material hardness, wall thickness, datum structure, grinding route and inspection method. Send the complete drawing for a feature-by-feature review rather than relying on one general tolerance value.
What is the difference between surface, OD and ID grinding?
Surface grinding controls flat faces and reference surfaces. OD grinding finishes external cylindrical features, while ID grinding finishes bores and internal cylindrical features. The correct route depends on access, datums and functional geometry.
How is grinding burn controlled?
Grinding burn risk is managed through wheel selection and condition, dressing, coolant delivery, material removal strategy, spark-out and process monitoring. Additional verification can be reviewed when the drawing or application requires it.
Can you provide a surface-roughness result?
Yes, surface-roughness inspection can be included when the drawing identifies the required parameter, direction, cutoff or evaluation condition and measurement location.
What files and information should I send?
Send STEP, STP, IGES, X_T, DWG, DXF or PDF files with material, heat-treatment condition, quantity, datums, final tolerances, surface finish and inspection requirements clearly marked.