Bearing Ring Grinders

Selection criteria

Raceway form accuracy, cycle time, automation.

Supply chain

Bearing ring grinders are a specialised segment of the machine-tool industry; Chinese bearing clusters (Wafangdian, Luoyang, Zhejiang) are supported by domestic grinder makers, while the top precision bearing makers often build their own. For motor buyers this step explains vibration-grade differences between bearing brands.

Buyer FAQ

What raceway accuracy separates low-noise bearings from standard ones?

For small deep-groove bearings, standard grades typically have raceway roundness around 1–2 µm, while low-noise grades hold well under 1 µm together with tighter groove-radius and waviness control. These figures come from grinder stiffness, in-process gauging and wheel dressing, and are then refined by superfinishing.

What should I look for in an automatic ring-grinding line?

Look for in-process gauging with automatic size compensation, CBN or well-dressed abrasive wheels, and automatic loading between face, OD, bore and raceway operations. Small rings run in a few seconds each on modern lines. SPC data from the gauges is what keeps size and form consistent across shifts.

As a motor buyer, what should I ask bearing suppliers about grinding quality?

Ask for the tolerance class (ISO 492 Normal/P0 or P6), vibration grade (Z1–Z4 or V1–V4) and sample raceway roundness and waviness data. Request vibration test results from a production lot rather than a single sample, because grinding consistency is what separates bearing brands.

Where it is used