Precision Grinding

Precision grinding is our core process. It holds tight tolerances on the working surfaces of mold and die-cast components. We grind core pins, mandrels, ejector pins, and blades to print in Orange County, California, and we hold ground diameters as tight as 0.00005 in.

Grinding methods, all in-house

We run the full range of precision grinding under one roof, so a part does not have to leave the building to get finished:

• Centerless grinding — high-volume, repeatable diameters across a run.
• Cylindrical / OD grinding — outside diameters on pins and mandrels, ground between centers to hold straightness over length.
• ID grinding — bores and internal diameters.
• Surface grinding — flats on blades, heads, and shoulders.
• Form grinding — profiles and points.
• Thread grinding — precision threads.

Tolerances

We hold ground diameters as tight as 0.00005 in. The exact tolerance depends on the feature and the part, so send your print and we will tell you what we can hold.

Grinding as the finishing step

Grinding holds diameter and straightness on the working surfaces of every core pin, mandrel, ejector pin, and blade we ship for medical, aerospace, and electronics tooling.

Grinding removes material with an abrasive wheel rather than a cutting edge, so it finishes a part after hardening. The exact tolerance depends on the feature and the part.

Frequently asked questions

What is the difference between centerless and cylindrical grinding? Cylindrical grinding holds the part between centers or in a chuck and is suited to features that have to stay true to a datum, like a pin diameter referenced to its head. Centerless grinding supports the part on its own outside diameter and is faster for repeatable diameters across a run. We run both in-house, along with ID, surface, form, and thread grinding, and choose the method to fit the feature and the quantity.

Can you grind hardened tool steel? Yes. Grinding is the standard way to finish a part after it has been hardened, because the abrasive wheel holds tolerance on material that is too hard to turn.

What tolerances can you hold? We hold ground diameters as tight as 0.00005 in. The exact tolerance depends on the feature, so send your print and we will confirm what we can hold for your part.

Can you grind to a sample if I do not have a print? Yes. Send the worn or original part and we measure it, reverse it to a quotable print, and grind the replacement to match.

Request a quote

Send your print or sample. Call (714) 540-5621 or request a quote.