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Precision Rolling Bearings for Machine Tools

 

 roulements_ntn_billes_céramiques Angular Ball Bearings with Ceramic Balls for Super High Speed Operation

These bearings present the super high speed dn value, 2,100,000 (as dmn value; 2,600,000) using air-oil lubrication. Boundary dimensions are equal to the ISO standard series, but super high speed revolution using air-oil lubrication can be obtained. Bearings also operate under high acceleration conditions.

note:

dn = bearing bore diameter in mm x rotational
        speed in rpm.

dmn = bearing ball PCD in mm x rotational
          speed in rpm.

(Ref. catalog "Precision Rolling Bearings for Machine Tools" CAT. No. 8401/E etc.)

 
 roulements_ntn_vis_billes

Ball Screw Support Bearings

Compact design of bearing units makes high speed and rigidity possible. Preload on the bearing can be changed in two to three steps according to the spindle rotational speed. It is possible to select a heavy-loading mode in the slow speed range, and the most suitable shaft rigidity and machining conditions in the high speed range with light preload. The grooved shaft design solved the rise of preload due to the compact design of the spindle and the expansion of the bearing inner ring at high speed.

(Ref. catalog "Precision Rolling Bearings for Machine Tools" CAT. No. 8401/E etc.)  

 roulement_ntn-mecanisme Bearing Unit with adjustable preload mechanism

Compact design of bearing units makes high speed and rigidity possible. Preload on the bearing can be changed in two to three steps according to the spindle rotational speed. It is possible to select a heavy-loading mode in the slow speed range, and the most suitable shaft rigidity and machining conditions in the high speed range with light preload. The grooved shaft design solved the rise of preload due to the compact design of the spindle and the expansion of the bearing inner ring at high speed.

(Ref. catalog "Precision Rolling Bearings for Machine Tools" CAT. No. 8401/E etc.)