NTN - Precision Rolling Bearings

Precision Rolling Bearings
Page
TECHNICAL DATA
CONTENTS
1. Classification of Precision Rolling Bearings for Machine Tools 24
q Main spindle bearings 2
w Ball screw support bearings 4
2. Bearing Selection and Shaft & Housing Design 515
q Bearing selection 5
w Bearing accuracy 7
e Bearings and rigidity 11
r Designing bearing and housing 14
3. Load Rating and Life1621
q Bearing life 16
w Static load rating and allowable axial load20
4. Allowable Speed 21
5. Bearing Arrangements and Structures of Bearings for Main Spindles 2226
q Bearing arrangement for main spindles 22
w Bearing selection based on bearing arrangement for main spindle 24
e Adjustable preload bearing unit 25
r Bearing jacket cooling system 26
6. Handling of Bearings 2738
q Cleaning and filling with grease 27
w Mounting 28
e Tightening of inner ring 30
r Elastic deformation of spacer resulting from tightening force31
t Front cover drive-up 31
y Checking axial rigidity 32
u Clearance adjustment for cylindrical roller bearing 33
i Cylindrical roller bearing tapered bore and main spindle taper angle 37
o Running-in operation for main spindle bearing 38
7. Lubrication of Bearings 3947
q Grease lubrication 40
w Air-oil lubrication41
e Jet lubrication 47
8. New Technologies 4853
q The new series of super-high-speed precision bearings
for machine tool main spindles "ULTAGE Series" 48
w New material and new surface modification technology 48
e Environmentally conscious technology 50
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