Page 29 of catalogue Ground ball screws of SKF Linearsysteme GmbH

BALL Screws RIGIDITY CARTIFICATE ACCURACY CLASS ISO 3
SKF BSS TORINO - ITALY Screw Diameter Lead Ball Diameter Required Rigidity

Customer Customer drawing 171.892.3

SKF BSS code VS 404211 Serial No. 113047 PRODUCT INSPECTION

No. 40949 Date 05/03/03 17.31.20 / 2586

40 mm
100 daN 50 daN 200 daN

5 mm

3,5

mm

90/

150 daN/ μm
F [ daN] 240

Preload

Fpr

F1 = 0,5 x Fpr F2 = 2 x Fpr
Δλ1 = Δλ2 =
1,004 3,889 μm μm

210

180

150

are the sum of the elastic deformations in the two directions caused respectively by the axial loads ±F e ±F
1 2

120

Rigidity in the range

±F1
99,6 daN/ μm

90

Rnu1 =

2F1
Δλ1

=

60

Rigidity in the range and

+F1 to +F2 -F1 to -F2
= 104,0 daN/ μm

30 Deformation Dλ [ μm ] -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 -3 0 1 2 3 4 5 6 7 8 9

4

Rnu2 =

2(F 2-F 1)
Δλ2 - Δλ1

-6 0

-9 0

-120

- 150

-180

-210

- 240

SKF BSS code

SKF BSS

29