What is finish grinding in precision bearings?

Finish grinding in precision bearings involves grinding a roll with its bearings in place to achieve very low total indicated runout (T.I.R.). This improves accuracy and simplifies installation in production lines.

What should be considered when finishing in bearings?

Finishing in bearings creates a dedicated assembly including bearings, seals, housing caps, and related hardware. All components between the bearings must be supplied by the customer for proper installation.

Precision Roll Grinding Glossary: Common Terms Used Around Precision Rolls

Q: What is decorative chrome plating?

Decorative chrome plating is used for aesthetic purposes such as on furniture, motorcycles, and similar items. It involves electroplating a thin layer of chromium and is different from hard chromium plating. Roll Technology does not provide decorative plating.

Q: What is a fine precision ground and belt polished finish?

This finish involves precision grinding a roll after chromium plating, followed by belt polishing to achieve a smooth surface.

Q: What is a fine precision ground finish?

A fine precision ground finish is achieved by grinding a roll after chromium plating without polishing and is typical of high precision coating rolls.

Q: What is hard chromium plating?

Hard chromium plating produces an extremely hard surface, typically 68 to 70 Rc, for wear resistance and smooth finishes. Rolls must be precision ground after plating to achieve required tolerances and surface finish.

Understanding industry terminology is essential when working with precision rolls. Our precision roll grinding glossary provides helpful definitions to explain words, terms, and processes used throughout our website. These explanations are designed to clarify key concepts in roller coating, chrome plating, and industrial roll services. Please contact us if you need further clarification or additional information about any aspect of Roll Technology services or procedures.

What are common terms used around precision rolls?

We provide the following definitions to help explain words, terms, and processes used within the text of our website. This glossary is designed to make technical terminology easier to understand for customers and industry professionals alike.

What does chromium plated and belt polished mean?
Roll to be received ready to plate with a fine ground, defect-free finish. Roll Technology would belt polish, hard chromium plate, and belt polish the roll face. No precision grinding is involved.

What is cylindrical roll grinding?
Cylindrical, precision roll grinding involves supporting the roll, shaft, or drum either between machined centers or directly on the roll's bearing surfaces. The outside diameter of the roll is then precision ground using appropriate grinding wheels. Critical to the roll grinding operation is basic knowledge such as the construction of the roll, wall thickness, deflection characteristics, and the base metal material.

What is decorative chrome plating?
Decorative chrome plating such as that used on furniture, motorcycles, hubcaps, etc. is a completely different process from hard chromium plating. It involves electroplating a thin layer of chromium onto a metal object. Roll Technology does not do decorative plating.

What is a fine precision ground and belt polished finish?
Roll to be precision ground after chromium plating to a fine ground finish and then belt polished smooth.

What is a fine precision ground finish?
Roll to be precision ground after chromium plating and shipped with a fine ground (not polished) finish. Typical of high precision coating rolls.

What is finished grinding in precision bearings?
When it is necessary to produce an industrial roll that has the lowest possible operating T.I.R. (precision roll coating, precision calendering, etc.), it is possible to cylindrically grind the roll with its precision bearings in place on the journals.

When a roll is ground in its bearings, the resulting T.I.R. is typically lower than the specified accuracy of the bearings. Finishing in bearings also significantly simplifies the installation of the roll into a production line. The cost of finishing in bearings is usually offset by the savings in installation costs.

Finishing in bearings creates a dedicated assembly of the roll, bearings, seals, housing caps, locknuts, and other related hardware. All items mounted on the journals located between the bearings need to be supplied by the customer for mounting in place by Roll Technology technicians.

What is hard chromium plating?
Hard chromium plating, as the name implies, is extremely hard (68-70 Rc as deposited) and, as such, is suitable for a wide variety of industrial applications that require resistance to wear. It is also the finest metal deposition to utilize when specifications call for very low smoothness characteristics on the roll face.

Hard chromium plated rolls must be precision ground after plating to obtain exacting tolerances for accuracy and surface finish.