
Grinding
Grinding capabilities across the platform. The right process when a surface needs a finish, a flatness, or a fit that cutting tools alone cannot deliver.
GRINDING
Precision Surfaces. Finished to Print.
Grinding removes material with an abrasive wheel instead of a cutting tool, taking a part to a finish and size that milling and turning cannot reach. Outside and inside diameters are ground round and to size. Flat surfaces are ground flat and parallel. Jig grinding finishes precisely located holes and complex contours in hardened material. Lapping takes a surface even further, bringing flatness down into the low millionths of an inch. For hardened steel, wear surfaces, and mating components, grinding is often the step that makes the part work.
Grinding comes after a part is machined and heat treated, which makes it the stage where final size and geometry get locked in. The process holds tight dimensions on hard materials, produces consistent surface finishes, and pairs with in-house inspection to verify the result. Facilities across the platform cover OD, ID, surface, and jig grinding, and lapping for a level of flatness that not every shop offers.
Compass Facilities Offering Grinding
Accu-Tool
Apex, NC
Advanced Machining & Tooling
Salisbury, NC
Douglas Machining Services
Winona, MN
Trutron Corporation
Troy, MI

GRINDING
Where Grinding Delivers Beyond Machining
- Production tooling, dies, and punches made from hardened steel, where the finish and fit have to hold after heat treat
- Aerospace and defense components with tight bores, flat mating faces, and demanding surface requirements
- Fluid power pump components, where sealing surfaces and bore fits control how the part performs
- Directional drilling components that combine hard materials with close-tolerance diameters
GRINDING
CNC Jig Grinding
Complex geometries, including cam contours and elliptical profiles, are finished using CNC continuous-path jig grinders. Integrated rotary tables enable 5-axis grinding with tight profile tolerances and high-quality surface finishes for demanding precision components.

| Location | Machining | Turning | EDM | Secondary | Metrology | Fabrication | Certifications | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3-Axis | 4-Axis | 5-Axis | Horizontal | Automation | CNC | Mill/Turn | Swiss | Hole Popper | Sinker | Wire | Grinding | Heat Treat | Finishing | CMM | SPC | Vision | Assembly | Bending | Laser | Stamping | Welding | AS9100D | ISO 9001:2015 | CMMC | ITAR | |
| Accu-Tool Apex, NC | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | |||||||
| Advanced Machining Salisbury, NC | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ○ | ● | ||||||||
| Bergeron Machine Westford, MA | ● | ● | ● | ● | ● | ● | ● | ○ | ● | |||||||||||||||||
| Douglas Machining Winona, MN | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||||||||||||
| Gray Manufacturing Denver, NC | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ○ | ● | ||||||||||||
| Pocasset Machine Bourne, MA | ● | ● | ● | ● | ● | ● | ● | ● | ||||||||||||||||||
| Quality Products Charlotte, NC | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ○ | ● | ● | ● | |||||
| R&D Machine Oldsmar, FL | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | |||||||||||
| Strom Manufacturing North Plains, OR | ● | ● | ● | ● | ● | ● | ● | ● | ● | ○ | ||||||||||||||||
| Tri-Tec Industries Charlotte, NC | ● | ● | ● | ● | ● | ● | ● | |||||||||||||||||||
| Trutron Corporation Troy, MI | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||||||

GRINDING
Not Sure If Grinding Is the Right Process for Your Part?
With OD, ID, surface, and jig grinding, plus lapping, across the Compass Precision platform, let’s review your material, finish, and flatness requirements to identify the right process and facility for your program.
