Precision Grinding
Precision grinding holds tolerances beyond normal machining, typically down to ±0.001–0.003 mm, with fine finishes and tight geometry such as flatness, roundness and parallelism. It is used on gauges, tooling, bearing fits and critical hardened components.
What it is
Precision grinding relies on well-maintained machines, balanced and dressed wheels, controlled temperatures, and careful measurement. Final passes remove only a few microns while the part is checked against the tolerance.
It spans surface, cylindrical, internal and jig grinding, applied wherever the drawing asks for accuracy that machining alone cannot deliver.
Typical applications
- Plug, ring and snap gauges
- Press tool and die components
- Precision spindles and bearing fits
- Hydraulic spools and sleeves
- Measuring and inspection fixtures
Suitable materials
- Hardened and case-hardened steels
- Alloy and tool steels
- Stainless steel
- Cast iron
- Tungsten carbide
Points to consider
- Micron tolerances need temperature-stable inspection; specify measurement conditions where critical.
- Stress relieve before final grinding to avoid movement afterwards.
- Apply the tightest tolerances only to functional features.
- Carbide parts need diamond wheels; mention the material early.
Frequently asked questions
How accurate is precision grinding?
Typically ±0.001–0.003 mm on critical features, with geometric accuracy (flatness, roundness) within a few microns.
Can carbide be ground?
Yes, using diamond grinding wheels. Carbide is common for wear parts, punches and gauges.
Why does my part change size after grinding?
Usually residual stress or temperature. Stress relieving before finishing and measuring at room temperature avoids this.