STAR – Precision Ball Screw Assemblies

STAR – Precision Ball Screw Assemblies
Preload and Rigidity
Dynamic drag torque, preload
and rigidity for screws with
single nut
T ta = overall dynamic drag torque
T ta = T pra + T RD
C = basic dynamic load rating
C 0 = basic static load rating
T RD = dynamic drag torque of 2 seals
R S = rigidity of the screw
R nu = rigidity of the nut
T pr0 = dynamic drag torque
without a seal
d o = nominal diameter
P = lead
D w = ball diameter
i = number of ball track turns
The dynamic drag torque indicates in
practice the nut preloading.
N.B.:
Measurement of the dynamic load torque
! see “Mounting“ on page 90.
Size
d x P x D - i
o w
Load ratings
dyn.
C
(N)
stat.
C 0
(N)
(mm) (mm)
8 x 2.5R x 1.588 - 3 2200 2800 0.02 0.010 0.015 8
12 x 5R x 2 - 3 3800 5800 0.02 0.010 0.030 18
12 x 10R x 2 - 2 2500 3600 0.02 0.010 0.030 18
16 x 5R x 3 - 4 12300 16100 0.04 0.020 0.080 32
16 x 10R x 3 - 3 9600 12300 0.04 0.020 0.080 32
16 x 16R x 3 - 2 6300 7600 0.04 0.020 0.080 32
16 x 16R x 3 - 3 9300 12000 0.04 0.020 0.080 32
20 x 5R x 3 - 4 14300 21500 0.04 0.020 0.100 53
20 x 5R x 3 - 5 17500 27300 0.04 0.020 0.100 53
20 x 20R x 3.5 - 2 9100 12100 0.04 0.020 0.120 52
20 x 20R x 3.5 - 3 13300 18800 0.04 0.020 0.120 52
25 x 5R x 3 - 4 15900 27200 0.04 0.020 0.120 86
25 x 10R x 3 - 4 15700 27000 0.04 0.020 0.150 86
25 x 25R x 3.5 - 2 10100 15100 0.04 0.020 0.200 84
25 x 25R x 3.5 - 3 14700 23300 0.04 0.020 0.200 84
32 x 5R x 3.5 - 4 21600 40000 0.04 0.020 0.250 144
32 x 5L x 3.5 - 4 21600 40000 0.04 0.020 0.250 144
32 x 10R x 3.969 - 5 31700 58300 0.04 0.020 0.250 141
32 x 20R x 3.969 - 2 13500 21800 0.04 0.020 0.250 141
32 x 20R x 3.969 - 3 19700 33700 0.04 0.020 0.250 141
32 x 32R x 3.969 - 2 13400 22000 0.04 0.020 0.250 141
32 x 32R x 3.969 - 3 19500 34000 0.04 0.020 0.250 141
40 x 5R x 3.5 - 5 29100 64100 0.04 0.020 0.400 232
40 x 5L x 3.5 - 5 29100 64100 0.04 0.020 0.400 232
40 x 10R x 6 - 4 50000 86400 0.07 0.035 0.400 211
40 x 10L x 6 - 4 50000 86400 0.07 0.035 0.400 211
40 x 12R x 6 - 4 49900 86200 0.07 0.035 0.400 211
40 x 16R x 6 - 4 49700 85900 0.07 0.035 0.400 211
40 x 20R x 6 - 3 37900 62800 0.07 0.035 0.400 211
40 x 40R x 6 - 2 25500 40300 0.07 0.035 0.400 211
40 x 40R x 6 - 3 37000 62300 0.07 0.035 0.400 211
50 x 5R x 3.5 - 5 32000 81300 0.04 0.020 0.500 373
50 x 10R x 6 - 6 79700 166500 0.07 0.035 0.600 345
50 x 12R x 6 - 6 79600 166400 0.07 0.035 0.600 345
50 x 16R x 6 - 6 79400 166000 0.07 0.035 0.600 345
50 x 20R x 6.5 - 3 47900 87900 0.07 0.035 0.600 340
50 x 20R x 6.5 - 5 75700 149700 0.07 0.035 0.600 340
50 x 40R x 6.5 - 2 32100 55800 0.07 0.035 0.600 340
50 x 40R x 6.5 - 3 46500 85900 0.07 0.035 0.600 340
63 x 10R x 6 - 6 88800 214300 0.07 0.035 0.700 569
63 x 20R x 6.5 - 3 53200 112100 0.07 0.035 1.200 563
63 x 20R x 6.5 - 5 83900 190300 0.07 0.035 1.200 563
63 x 40R x 6.5 - 2 36900 74300 0.07 0.035 1.200 563
63 x 40R x 6.5 - 3 53400 114100 0.07 0.035 1.200 563
80 x 10R x 6.5 - 6 108400 291700 0.07 0.035 1.400 938
80 x 20R x 9 - 6 170900 403900 0.09 0.045 2.200 894
80 x 20R x 12.7 - 6 262700 534200 0.11 0.055 2.200 832
100 x 10R x 6.5 - 6 119500 371900 0.07 0.035 2.200 1501
100 x 20R x 12.7 - 6 295100 686400 0.11 0.055 2.800 1366
125 x 10R x 6.5 - 6 130600 468700 0.07 0.035 3.600 2391
125 x 20R x 12.7 - 6 326500 870400 0.11 0.055 5.000 2220
* Values for T RD in the table apply for a standard seal.
T RD is approx. twice as high for a reinforced seal.
Backlash of
single nut
Standard
T * RD
ca. (Nm)
R S
(N/(µm·m))
86 RE 83 301/12.99
rreduced