Rexroth: Screw Assemblies. Catalog (R999001185/2020-03) - page 10

 

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Rexroth: Screw Assemblies. Catalog (R999001185/2020-03) - page 10

 

 

135
Technical data
Lead P
Minimum number of measurements for tolerance grade
Minimum number of measurements within
(mm)
3
5
7
9
300 mm (measuring interval) and excess
1
10
6
3
2
travel to be taken into consideration.
2
10
6
3
2
2.5
10
6
3
2
5
10
6
3
2
10
5
3
1
1
12
5
3
1
1
16
5
3
1
1
20
4
3
1
1
25
4
3
1
1
30
3
2
1
1
32
3
2
1
1
40
2
1
1
1
64
2
1
1
1
136
Screw Assemblies | Ball Screw Assemblies BASA
Technical data
Acceptance Conditions and Tolerance Grades
d0
l5
t5p in µm for l5
Run-outs and location deviations
t5p
AA'
l5
l5
l5
for tolerance grade
Based on DIN ISO 3408-3
Over
Up to
3
5
7
9
= 6
12
80
25
32
40
60
Radial run-out t5 of the outer diameter of
12
25
160
the screw over the length l5 used to deter-
25
50
315
mine the straightness relative to AA'.
50
100
630
A
A'
2 d
0
2 d0
l1/d0
t5max in µm
l1
for l1 ≥ 4 l5
Tolerance grade
l
5
l
5
Over
Up to
3
5
7
9
A
A'
40
50
64
80
120
40
60
75
96
120
180
60
80
125
160
200
300
80
100
200
256
320
480
Nominal
Reference
t6p in µm for l6 ≤ l
Coaxial deviation t6
of the bearing journal in
t6p
AA'
diameter
length
Tolerance grade
relation to AA' where l6 ≤ l.
d0
l
Table value t6p applies if I6 ≤ reference
Over
Up to
3
5
7
9
length I.
= 6
20
80
12
20
40
50
20
50
125
16
25
50
63
l6a
A
A'
50
125
200
20
32
63
80
Where l6 > l, then
t6a ≤t
2 d0
6p
l
l6
Nominal
Reference
t7p in µm for l7 ≤ l
Radial run-out t7 of the journal diameter of
Bearing seat
t7p
C
diameter
length
Tolerance grade
the ball screw shaft relative to the bearing
d0
l
diameter for l7 ≤ l.
Over
Up to
3
5
7
9
Table value t7p applies if I7 ≤ reference
= 6
20
80
6
8
12
14
length I.
20
50
125
8
10
16
18
C
50
125
200
10
12
20
23
l7a
Where l7 > l, then
t7a ≤t
l7
7p
l
Nominal diameter
t8p in µm
Axial run-out t8
of the shaft (bearing) face of
t8p
C
d0
for tolerance grade
the ball screw shaft relative to the bearing
Over
Up to
3
5
7
9
diameter.
F
= 6
63
4
5
6
8
63
125
5
6
8
10
C
Bearing seat
Flange diameter
t9p in µm
Axial run-out t9
of the ball nut location face
t9p
AA'
D5
for tolerance grade
in relation to A and A' (for preloaded ball
Over
Up to
3
5
7
9
nuts only).
16
32
12
16
20
-
F
32
63
16
20
25
-
63
125
20
25
32
-
125
250
25
32
40
-
A
A'
2 d0
2 d0
137
Technical data
Technical data
Outer diameter
t10p in µm
Radial run-out t10 of the outer diameter
t10p
AA'
D1
for tolerance grade
D1 of the ball nut relative to A and A' (for
fixed
Over
Up to
3
5
7
9
preloaded and rotating ball nuts only).
16
32
12
16
20
-
When measuring, fix the ball screw shaft to
32
63
16
20
25
-
prevent rotation.
63
125
20
25
32
-
125
250
25
32
40
-
A
A'
2 d0
2 d0
Please contact us for the permissible axial
and radial run-out with a driven nut
Limiting deviation ∆Tpp for the dynamic drag
Y
torque Tp0 resulting from preloading (for
preloaded ball nuts only)
F, F
t
1
Symbol definitions:
l
X = travel
Y
= Dynamic drag torque with preload
1
= Dynamometer
Tp = F · l without wiper
Tt
= Ft · l with wiper
ln
= Length of ball nut
lu - ln
lu - ln
X
lu / d0
Tp0 (Nm)
Tolerance grade
applies
3
5
7
9
3
5
7
9
to
>
≤
∆Tpp (% of Tp0); lu ≤ 4000 mm
∆Tpp (% of Tp0); lu > 4000 mm
≤ 40
0
0.4
40
50
50
-
60
60
70
-
0.4
0.6
35
40
40
-
50
50
60
-
0.6
1.0
30
35
40
-
40
45
50
-
1.0
2.5
25
30
35
-
35
40
45
-
2.5
6.3
20
25
30
-
30
35
40
-
6.3
10.0
15
20
30
-
25
30
35
-
10.0
15
20
30
-
25
30
35
-
> 40
0
0.4
50
60
60
-
60
60
70
-
0.4
0.6
40
45
45
-
50
50
60
-
0.6
1.0
35
40
45
-
40
45
50
-
1.0
2.5
30
35
40
-
35
40
45
-
2.5
6.3
25
30
35
-
30
35
40
-
6.3
10.0
20
25
35
-
25
30
35
-
10.0
20
25
35
-
25
30
35
-
138
Screw Assemblies | Ball Screw Assemblies BASA
Technical data
Preload and rigidity
Nut system preload
Preloaded single nut
Double nut
Single nuts can be preloaded in an
Bracing two single nuts eliminates the axial
In addition to single nuts with reduced
optimum way with preload classes C1, C2
play due to production-related issues and
backlash, Rexroth supplies preloaded or
or C3 by means of ball size selection.
increases rigidity, which improves position-
adjustable-preload nut systems.
ing accuracy.
To prevent the service life from being short-
ened, the preload should not amount to
1/3 of the average operating load. Depend-
ing on the application, we preload the nut
Single nut with
system with preload classes C4 or C5.
backlash
Preloaded and adjustable-
preload nut systems
Adjustable-preload single nut
Using adjustable-preload single nuts, the
Axial load
design process can be more favorably
priced for many applications.
With the same preload, the rigidity
You set the zero backlash or the preloading
behavior of these different Rexroth nut
radially by means of a slot that is approxi-
systems is virtually identical. The reason:
mately 0.1 mm wide; refer to the section
Installation of adjustable-preload single
entitled “Installation”.
nuts and preloaded single nuts is much
Depending on the application, we preload
more compact. The screw is typically far
the nut system with preload classes C1,
Driven nut FAR
less rigid than the nut unit (for details
C2 or C3. The maximum preload is preload
You can preload Series HP driven nuts like
see “Overall axial rigidity...”).
class C3.
a single nut using
preload classes C1, C2 or C3 by means of
ball size selection.
Single nut with flange FED
The HP series single nut with flange is
preloaded in an optimum way with preload
classes C1 or C2 by means of ball size
selection.
139
Technical data
Rigidity
Rigidity of the screw RS
The rigidity of a Ball Screw Assembly is
The rigidity of the screw RS depends on the
also affected by all adjoining parts such as
type of bearing used.
bearings, housing bores, nut housings, etc.
See the corresponding tables for rigidity
values.
Overall axial rigidity Rbs of the Ball Screw
Assembly
1 Fixed bearing of the ball screw shaft on
2 Fixed bearing of the ball screw shaft on
The overall axial rigidity Rbs is made up of
one end.
both ends.
the component rigidity of the bearing Rfb,
the screw RS and the nut unitRnu.
lS2
1
1
1
1
S
=
+
+
16
lS1
S2 ≤
Rbs Rfb RS Rnu
2
lS
Note:
Please note that in most cases the rigid-
2
(d0-0,71·D
w
)
S
ity RS of the screw will be significantly lower
R
165
18
S2
S2
S S2
than the rigidity Rnu of the nut unit. With
size 40 x 10, for example, the rigidity Rnu
of the nut unit is two to three times greater
than the rigidity RS of a 500 mm-long
The lowest screw rigidity occurs at the
screw.
center of the screw RS2min
( lS2 = lS/2) and thus equals:
Rigidity of the bearing Rfb
The rigidity of the bearings corresponds to
the values in the bearing manufacturer’s
catalog.
2
2
(d
0
-0,71·D
w
)
(d -0,71 D )
165
(N/ m)
0
19
See the dimension tables in this catalog
R
S1
17
RS2min
660
(N/µm)
S1
S
for the rigidity values of the bearings that
Rexroth can provide.
RS1 = rigidity of the screw
(N/mm)
RS2 = rigidity of the screw
(N/mm)
Rigidity in the area of the nut unit Rnu
d0
= nominal diameter
(mm)
d0
= nominal diameter
(mm)
The rigidity in the area of the preloaded nut
Dw = ball diameter
(mm)
Dw = ball diameter
(mm)
unit is calculated on the basis of
lS1
= Bearing - nut distance
(mm)
lS
= distance between
ISO 3408-4.
bearing and bearing
(mm)
See the corresponding tables for rigidity
lS2
= distance between
values.
bearing and nut
(mm)
140
Screw Assemblies | Ball Screw Assemblies BASA
Technical data
Preload and rigidity of single nuts
Size
Load ratings
Backlash of single nut
Rigidity of the screw
Dynamic drag torque, preload, and
rigidity for screws of tolerance grades 3,
dyn. C
stat. C0
Standard
Reduced
R
S
5, 7 with single nuts ZEV-E-S,
(C0)
(C00)
N·m
d0 x P x Dw - i
(N)
(N)
(mm)
(mm)
(
µm
)
FEP-E-S (C1 only),
6 x 1R x 0.8 - 3
1 080
1 030
0.01
0.005
5
FEM-E-S, FEM-E-B,
6 x 2R x 0.8 - 3
1 070
1 020
0.01
0.005
5
SEM-E-S and SEM-E-C
8 x 1R x 0.8 - 4
1 310
1 850
0.01
0.005
9
(pay attention to the centering diameter
8 x 2R x 1.2 - 4
2 360
2 950
0.01
0.005
9
8 x 2.5R x 1.588 - 3
2 640
2 800
0.02
0.010
8
D1 that is to be set)
8 x 5R x 1.588 - 3
2 500
2 650
0.02
0.010
8
ZEM-E-S, ZEM-E-K, ZEM-E-A,
12 x 2R x 1.2 - 4
2 690
4 160
0.01
0.005
21
FED-E-B, FAR-B-S
12 x 5R x 2 - 3
4 560
5 800
0.02
0.010
18
12 x 10R x 2 - 2
3 000
3 600
0.02
0.010
18
16 x 5R x 3 - 3
11 300
11 800
0.04
0.020
32
T0
= overall dynamic drag torque
16 x 5R/L x 3 - 4
14 800
16 100
0.04
0.020
32
T0
= Tp0 + TRD
16 x 10R x 3 - 3
11 500
12 300
0.04
0.020
32
C
= dynamic axial load capacity
16 x 16R x 3 - 2
7 560
7 600
0.04
0.020
32
16 x 16R x 3 - 3
11 200
12 000
0.04
0.020
32
C0
= static load rating
16 x 16R x 3 - 6
17 800
24 200
0.04
0.020
32
FPR = pre-tensioning force
20 x 5R/L x 3 - 4
17 200
21 500
0.04
0.020
53
TRD = dynamic drag torque of the 2 seals
20 x 5R x 3 - 5
21 000
27 300
0.04
0.020
53
20 x 10R x 3 - 4
16 900
21 300
0.04
0.020
53
RS
= rigidity of the screw
20 x 20R x 3.5 - 2
10 900
12 100
0.04
0.020
52
Rnu = rigidity of the nut
20 x 20R x 3.5 - 3
16 000
18 800
0.04
0.020
52
Tp0 = dynamic drag torque without seals
20 x 20R x 3.5 - 6
25 700
38 100
0.04
0.020
52
d0
= nominal diameter
20 x 40R x 3.5 - 4
14 000
26 200
0.04
0.020
52
25 x 5R/L x 3 - 4
19 100
27 200
0.04
0.020
86
P
= lead
25 x 5R x 3 - 7
31 400
48 700
0.04
0.020
86
Dw = ball diameter
25 x 10R x 3 - 4
18 800
27 000
0.04
0.020
86
i
= Number of load-bearing gears
25 x 10R x 3 - 5
23 200
34 200
0.04
0.020
86
25 x 25R 3.5 - 2
12 100
15 100
0.04
0.020
84
25 x 25R x 3.5 - 3
17 600
23 300
0.04
0.020
84
25 x 25R x 3.5 - 4.8
19 700
39 400
0.04
0.020
84
25 x 25R x 3.5 - 6
28 500
47 100
0.04
0.020
84
32 x 5R/L x 3.5 - 4
25 900
40 000
0.04
0.020
144
32 x 5R x 3.5 - 5
31 700
50 600
0.04
0.020
144
The values given for dynamic drag torque
32 x 10R x 3.969 - 5
38 000
58 300
0.04
0.020
141
are proven practical indicators for the nut
32 x 20R x 3.969 - 2
16 200
21 800
0.04
0.020
141
preloading.
32 x 20R x 3.969 - 3
23 600
33 700
0.04
0.020
141
32 x 20R x 3.969 - 6
38 300
67 300
0.04
0.020
141
32 x 32R x 3.969 - 2
16 100
22 000
0.04
0.020
141
Note:
32 x 32R x 3.969 - 3
23 400
34 000
0.04
0.020
141
To measure the dynamic drag torque, see
32 x 32R x 3.969 - 4.8
26 300
57 600
0.04
0.020
141
32 x 32R x 3.969 - 6
37 900
68 000
0.04
0.020
141
the “Installation” section page 147.
32 x 64R x 3.969 - 4
21 100
49 000
0.04
0.020
141
40 x 5R/L x 3.5 - 5
34 900
64 100
0.04
0.020
232
40 x 10R/L x 6 - 4
60 000
86 400
0.07
0.035
211
40 x 10R x 6 - 5
73 400
109 300
0.07
0.035
211
40 x 10R x 6 - 6
86 500
132 200
0.07
0.035
211
40 x 12R x 6 - 4
59 900
86 200
0.07
0.035
211
40 x 16R x 6 - 4
59 600
85 900
0.07
0.035
211
40 x 20R x 6 - 3
45 500
62 800
0.07
0.035
211
40 x 20R x 6 - 8
95 500
171 100
0.07
0.035
211
40 x 25R x 6 - 4
56 900
85 800
0.07
0.035
211
40 x 25R x 6 - 8
91 400
171 700
0.07
0.035
211
40 x 30R x 6 - 4
56 300
85 100
0.07
0.035
211
40 x 30R x 6 - 8
90 400
170 300
0.07
0.035
211
40 x 40R x 6 - 2
30 600
40 300
0.07
0.035
211
40 x 40R x 6 - 3
44 400
62 300
0.07
0.035
211
40 x 40R x 6 - 6
71 500
124 500
0.07
0.035
211
50 x 5R x 3.5 - 5
38 400
81 300
0.04
0.020
373
50 x 10R x 6 - 6
95 600
166 500
0.07
0.035
345
50 x 12R x 6 - 6
95 500
166 400
0.07
0.035
345
50 x 16R x 6 - 6
95 300
166 000
0.07
0.035
345
50 x 20R x 6.5 - 3
57 500
87 900
0.07
0.035
340
50 x 20R x 6.5 - 5
90 800
149 700
0.07
0.035
340
50 x 20R x 6.5 - 8
116 500
240 000
0.07
0.035
340
40 x 25R x 6.5 - 4
56 900
85 800
0.07
0.035
211
50 x 25R x 6.5 - 6
92 600
175 100
0.07
0.035
340
50 x 30R x 6.5 - 4
71 300
118 800
0.07
0.035
340
50 x 30R x 6.5 - 8
114 500
237 700
0.07
0.035
340
50 x 40R x 6.5 - 2
38 500
55 800
0.07
0.035
340
50 x 40R x 6.5 - 3
55 800
85 900
0.07
0.035
340
50 x 40R x 6.5 - 6
89 300
171 500
0.07
0.035
340
For sizes 63 and 80, see the next page.
141
Technical data
Size
Rigidity and dynamic drag torque of the single nuts
with preload class C1
Preload class C2
Preload class C3
Rnu
Fpr
Tp0
Rnu
Fpr
Tp0
Rnu
Fpr
Tp0
(N/mm)
(N)
(Nm)
(N/mm)
(N)
(Nm)
(N/mm)
(N)
(Nm)
d0 x P x Dw - i
Tolerance grade 3; 5; 7
Tolerance grade 3; 5; 7
Tolerance grade 3; 5; 7
6 x 1R x 0,8 - 3
-
-
-
-
-
-
-
-
-
6 x 2R x 0,8 - 3
-
-
-
-
-
-
-
-
-
8 x 1R x 0,8 - 4
-
-
-
-
-
-
-
-
-
8 x 2R x 1,2 - 4
-
-
-
-
-
-
-
-
-
8 x 2,5R x 1,588 - 3
70
44
0,004
-
-
-
-
-
-
8 x 5R x 1,588 - 3
70
42
0,003
-
-
-
-
-
-
12 x 2R x 1,2 - 4
-
-
-
-
-
-
-
-
-
12 x 5R x 2 - 3
100
76
0,009
-
-
-
-
-
-
12 x 10R x 2 - 2
60
50
0,006
-
-
-
-
-
-
16 x 5R x 3 - 3
160
190
0,030
-
-
-
-
-
-
16 x 5R/L x 3 - 4
210
250
0,040
240
370
0,060
290
620
0,100
16 x 10R x 3 - 3
160
190
0,030
190
290
0,050
220
480
0,080
16 x 16R x 3 - 2
100
130
0,020
120
190
0,030
140
320
0,050
16 x 16R x 3 - 3
160
190
0,030
180
280
0,050
210
470
0,070
16 x 16R x 3 - 6
250
280
0,050
290
430
0,070
-
-
-
20 x 5R/L x 3 - 4
270
290
0,060
310
430
0,090
360
720
0,140
20 x 5R x 3 - 5
340
350
0,070
390
530
0,110
450
880
0,180
20 x 10R x 3 - 4
270
280
0,060
300
420
0,090
360
710
0,140
20 x 20R x 3,5 - 2
130
180
0,040
150
270
0,060
180
460
0,090
20 x 20R x 3,5 - 3
200
270
0,050
230
400
0,080
280
670
0,130
20 x 20R x 3,5 - 6
330
410
0,080
380
620
0,130
-
-
-
20 x 40R x 3,5 - 4
230
280
0,060
-
-
-
-
-
-
25 x 5R/L x 3 - 4
320
320
0,080
360
480
0,120
430
800
0,200
25 x 5R x 3 - 7
560
520
0,130
-
-
-
-
-
-
25 x 10R x 3 - 4
320
310
0,080
370
470
0,120
430
790
0,200
25 x 10R x 3 - 5
400
390
0,100
-
-
-
-
-
-
25 x 25R 3,5 - 2
160
200
0,050
180
300
0,080
220
510
0,130
25 x 25R x 3,5 - 3
240
290
0,070
270
440
0,110
320
740
0,180
25 x 25R x 3,5 - 4,8
370
390
0,100
-
-
-
-
-
-
25 x 25R x 3,5 - 6
400
440
0,110
450
680
0,170
-
-
-
32 x 5R/L x 3,5 - 4
390
430
0,140
440
650
0,210
520
1 080
0,350
32 x 5R x 3,5 - 5
490
530
0,170
-
790
-
-
-
-
32 x 10R x 3,969 - 5
510
630
0,200
580
950
0,300
690
1 590
0,510
32 x 20R x 3,969 - 2
200
270
0,090
230
410
0,130
270
680
0,220
32 x 20R x 3,969 - 3
300
390
0,130
350
590
0,190
410
990
0,320
32 x 20R x 3,969 - 6
500
610
0,200
570
920
0,290
-
-
-
32 x 32R x 3,969 - 2
200
270
0,090
220
400
0,130
270
670
0,210
32 x 32R x 3,969 - 3
300
390
0,120
340
590
0,190
400
980
0,310
32 x 32R x 3,969 - 4,8
470
530
0,170
-
-
-
-
-
-
32 x 32R x 3,969 - 6
490
610
0,190
560
910
0,290
-
-
-
32 x 64R x 3,969 - 4
350
420
0,140
-
-
-
-
-
-
40 x 5R/L x 3,5 - 5
580
580
0,230
660
870
0,350
770
1 460
0,580
40 x 10R/L x 6 - 4
510
1 000
0,400
580
1 500
0,600
690
2 500
1,000
40 x 10R x 6 - 5
650
1 230
0,490
740
1 850
0,730
870
3 080
1,220
40 x 10R x 6 - 6
770
1 440
0,580
880
2 160
0,870
1 030
3 610
1,440
40 x 12R x 6 - 4
510
1 000
0,400
590
1 500
0,600
690
2 500
1,000
40 x 16R x 6 - 4
510
990
0,400
590
1 490
0,600
690
2 490
0,990
40 x 20R x 6 - 3
380
760
0,300
440
1 140
0,460
510
1 900
0,760
40 x 20R x 6 - 8
850
1 530
0,610
960
2 290
0,920
-
-
-
40 x 25R x 6 - 4
500
950
0,380
570
1 420
0,568
680
2 350
0,940
40 x 25R x 6 - 8
830
1 460
0,584
940
2 190
0,876
-
-
-
40 x 30R x 6 - 4
490
940
0,376
570
1 410
0,564
670
2 350
0,940
40 x 30R x 6 - 8
810
1 450
0,580
930
2 170
0,868
-
-
-
40 x 40R x 6 - 2
240
510
0,200
280
770
0,310
330
1 280
0,510
40 x 40R x 6 - 3
370
740
0,300
420
1 110
0,440
500
1 850
0,740
40 x 40R x 6 - 6
600
1 140
0,460
690
1 720
0,690
-
-
-
50 x 5R x 3,5 - 5
690
640
0,320
780
960
0,480
910
1 600
0,800
50 x 10R x 6 - 6
910
1 590
0,800
1 040
2 390
1,200
1 220
3 990
1,990
50 x 12R x 6 - 6
920
1 590
0,800
1 050
2 390
1,190
1 230
3 980
1,990
50 x 16R x 6 - 6
920
1 590
0,790
1 050
2 380
1,190
1 240
3 970
1,990
50 x 20R x 6,5 - 3
480
960
0,480
540
1 440
0,720
640
2 400
1,200
50 x 20R x 6,5 - 5
790
1 510
0,760
900
2 270
1,140
1 060
3 790
1,890
50 x 20R x 6,5 - 8
1 030
1 860
0,930
1 180
2 800
1,400
-
-
-
50 x 25R x 6.5 - 4
620
1 200
0,600
710
1 790
0,90
840
2 990
1,500
50 x 25R x 6,5 - 6
780
1 480
0,740
890
2 220
1,110
-
-
-
50 x 30R x 6,5 - 4
620
1 190
0,595
700
1 780
0,890
830
2 970
1,485
50 x 30R x 6,5 - 8
1 020
1 830
0,915
1 160
2 750
1,375
-
-
-
50 x 40R x 6,5 - 2
300
640
0,320
350
960
0,480
410
1 610
0,800
50 x 40R x 6,5 - 3
460
930
0,470
520
1 400
0,700
620
2 330
1,160
50 x 40R x 6,5 - 6
750
1 430
0,710
860
2 140
1,070
-
-
-
For sizes 63 and 80, see the next page.
142
Screw Assemblies | Ball Screw Assemblies BASA
Technical data
Preload and rigidity of single nuts
Size
Load ratings
Backlash of single nut
Rigidity of the screw
Standard
Reduced
RS
dyn. C
stat. C0
(C0)
(C00)
N·m
d0 x P x Dw - i
(N)
(N)
(mm)
(mm)
(
µm
)
63 x 10R x 6 - 6
106,600
214,300
0.07
0.035
569
63 x 20R x 6.5 - 3
63,800
112,100
0.07
0.035
563
63 x 20R x 6.5 - 5
100,700
190,300
0.07
0.035
563
63 x 20R x 6.5 - 8
130,800
292,000
0.07
0.035
563
63 x 40R x 6.5 - 2
44,300
74,300
0.07
0.035
563
63 x 40R x 6.5 - 3
64,100
114,100
0.07
0.035
563
63 x 40R x 6.5 - 6
100,000
230,600
0.07
0.035
563
80 x 10R x 6.5 - 6
130,100
291,700
0.07
0.035
938
80 x 20R x 12.7 - 6
315200
534,200
0.11
0.055
832
Preload and rigidity of double nuts
Size
Load ratings
Rigidity of the screw
Dynamic drag torque, preload, and
RS
rigidity for screws of tolerance grades 3,
dyn. C
stat. C0
5, 7 with double nuts
N·m
(
)
d0 x P x Dw - i
(N)
(N)
µm
FDM-E-S, FDM-E-B
16 x 5R x 3 - 4
14,800
16,100
32
20 x 5R x 3 - 4
17,200
21,500
53
T0
= overall dynamic drag torque
25 x 5R x 3 - 4
19,100
27,200
86
T0
= Tp0 + TRD
25 x 10R x 3 - 4
18,800
27,000
86
C
= dynamic axial load capacity
32 x 5R x 3.5 - 4
25,900
40,000
144
C0
= static load rating
32 x 10R x 3.969 - 5
38,000
58,300
141
TRD = dynamic drag torque of the 2 seals
40 x 5R x 3.5 - 5
34,900
64,100
232
RS
= rigidity of the screw
40 x 10R x 6 - 4
60,000
86,400
211
Rnu = rigidity of the nut
40 x 10R x 6 - 6
86,500
132,200
211
Tp0 = dynamic drag torque without seals
40 x 20R x 6 - 3
45,500
62,800
211
d0
= nominal diameter
50 x 5R x 3.5 - 5
38,400
81,300
373
P
= lead
50 x 10R x 6 - 4
66,500
109,000
345
Dw = ball diameter
50 x 10R x 6 - 6
95,600
166,500
345
i
= number of ball track turns
50 x 20R x 6.5 - 5
90,800
149,700
340
63 x 10R x 6 - 4
74,200
140,500
569
63 x 10R x 6 - 6
106,600
214,300
569
63 x 20R x 6.5 - 5
100,700
190,300
563
The values given for dynamic drag torque
80 x 10R x 6.5 - 6
130,100
291,700
938
are proven practical indicators for the nut
80 x 20R x 12.7 - 6
315,200
534,200
832
preloading.
Note:
To measure the dynamic drag torque, see
the “Installation” section page 147.
143
Technical data
Size
Rigidity and dynamic drag torque of the single nuts
with preload class C1
Preload class C2
Preload class C3
Rnu
Fpr
Tp0
Rnu
Fpr
Tp0
Rnu
Fpr
Tp0
(N/µm)
(N)
(Nm)
(N/µm)
(N)
(Nm)
(N/µm)
(N)
(Nm)
d0 x P x Dw - i
Tolerance grade 3; 5; 7
Tolerance grade 3; 5; 7
Tolerance grade 3; 5; 7
63 x 10R x 6 - 6
1,100
1,780
1.120
1,250
2,660
1.68
1,460
4,440
2.800
63 x 20R x 6.5 - 3
570
1,060
0.670
650
1,600
1.01
770
2,660
1.680
63 x 20R x 6.5 - 5
950
1,680
1.060
1,080
2,520
1.59
1,280
4,200
2.640
63 x 20R x 6.5 - 8
1,250
2,090
1.320
1,430
3,140
1.98
-
-
-
63 x 40R x 6.5 - 2
390
740
0.460
440
1,110
0.70
520
1,850
1.160
63 x 40R x 6.5 - 3
580
1,070
0.670
660
1,600
1.01
780
2,670
1.680
63 x 40R x 6.5 - 6
950
1,600
1.010
1,080
2,400
1.51
-
-
-
80 x 10R x 6.5 - 6
1,290
2,170
1.730
1,460
3,250
2.60
1,700
5,420
4.340
80 x 20R x 12.7 - 6
1,430
5,250
4.200
1,620
7,880
6.31
1,910
13,100
10.510
Size
Rigidity and dynamic drag torque of the double nuts
with preload class C5
with preload class C4
Tolerance grade 3; 5; 7
Tolerance grade 3; 5; 7
Rnu
Fpr
Tp0
Rnu
Fpr
Tp0
d0 x P x Dw - i
(N/µm)
(N)
(Nm)
(N/µm)
(N)
(Nm)
16 x 5R x 3 - 4
320
860
0.06
360
1,230
0.08
20 x 5R x 3 - 4
400
1,000
0.08
450
1,430
0.11
25 x 5R x 3 - 4
470
1,110
0.11
330
1,590
0.16
25 x 10R x 3 - 4
480
1,100
0.11
440
1,570
0.16
32 x 5R x 3.5 - 4
570
1,510
0.19
640
2,160
0.28
32 x 10R x 3.969 - 5
770
2,220
0.28
860
3,170
0.41
40 x 5R x 3.5 - 5
850
2,040
0.33
950
2,910
0.47
40 x 10R x 6 - 4
760
3,500
0.56
850
5,000
0.80
40 x 10R x 6 - 6
1,150
5,050
0.81
1,280
7,210
1.15
40 x 20R x 6 - 3
570
2,650
0.42
640
3,790
0.61
50 x 5R x 3.5 - 5
1,000
2,240
0.45
1,110
3,200
0.64
50 x 10R x 6 - 4
900
3,880
0.78
1,010
5,540
1.11
50 x 10R x 6 - 6
1,350
5,580
1.12
1,510
7,970
1.59
50 x 20R x 6.5 - 5
1,180
5,300
1.06
1,320
7,570
1.51
63 x 10R x 6 - 4
1,080
4,330
1.09
1,200
6,180
1.56
63 x 10R x 6 - 6
1,620
6,220
1.57
1,800
8,880
2.24
63 x 20R x 6.5 - 5
1,420
5,870
1.48
1,590
8,390
2.11
80 x 10R x 6.5 - 6
1,870
7,590
2.43
2,070
10,800
3.47
80 x 20R x 12.7 - 6
2,130
18,400
5.88
2,380
26,300
8.41
144
Screw Assemblies | Ball Screw Assemblies BASA
Technical data
Frictional torques of the seals
Size
Dynamic drag torque
Seal torque for single
Standard seal
reinforced seal
Low-friction seal
and double nuts
d0 x P x Dw
TRD approx.
TRD approx.
TRD = 0 Nm
T0
= overall dynamic drag torque
(Nm)
(Nm)
T0
= Tp0 + TRD
6 x 1R x 0.8
-
-
TRD = dynamic drag torque of the 2 seals
6 x 2R x 0.8
-
-
Tp0 = dynamic drag torque without seals
8 x 1R x 0.8
-
-
d0
= nominal diameter
8 x 2R x 1.2
-
-
P
= lead
8 x 2.5R x 1.588
0.015
-
Dw = ball diameter
8 x 5R x 1.588
0.015
-
-
12 x 2R x 1.2
0.030
-
12 x 5R x 2
0.030
-
12 x 10R x 2
0.030
-
16 x 5R x 3
0.080
-
16 x 5L x 3
0.080
-
16 x 10R x 3
0.080
-
Note:
16 x 16R x 3
0.080
-
To measure the dynamic drag torque, see
20 x 5R x 3
0.100
-
the “Installation” section page 147.
20 x
5L x 3
0.100
-
-
20 x
10R x 3
0.120
-
-
20 x
20R x 3.5
0.120
-
20 x
40R x 3.5
0.040
-
25 x
5R x 3
0.120
0.34
25 x
5L x 3
0.120
-
-
25 x
10R x 3
0.150
0.29
25 x
25R x 3.5
0.200
0.25
32 x
5R x 3.5
0.250
0.51
32 x
5L x 3.5
0.250
-
-
32 x
10R x 3.969
0.250
0.46
32 x
20R x 3.969
0.250
0.49
32 x
32R x 3.969
0.250
0.45
32 x
64R x 3.969
0.250
0.45
40 x
5R x 3.5
0.400
0.85
40 x
5L x 3.5
0.400
-
-
40 x
10R x 6
0.400
0.91
40 x
10L x 6
0.400
-
-
40 x
12R x 6
0.400
-
-
40 x
16R x 6
0.400
-
-
40 x
20R x 6
0.400
0.54
40 x
25R x 6
0.400
0.54
-
40 x
30R x 6
0.400
0.54
-
40 x
40R x 6
0.400
0.54
50 x
5R x 3.5
0.500
-
-
50 x
10R x 6
0.600
0.95
-
50 x
12R x 6
0.600
-
-
50 x
16R x 6
0.600
-
-
50 x
20R x 6.5
0.600
0.95
-
50 x
25R x 6.5
0.700
-
-
50 x
30R x 6.5
0.700
0.95
-
50 x
40R x 6.5
0.700
-
-
63 x
10R x 6
1.200
-
-
63 x
20R x 6.5
1.200
1.40
-
63 x
40R x 6.5
1.200
1.40
-
80 x
10R x 6.5
1.400
-
-
80 x
20R x 12.7
2.200
-
-
145
Technical data
When retrofitting and changing
Standard nuts
FED nut
over the seals, please note:
All precision screws with small leads are
Fig. 1
single-start
Single-start seal
(Figure 1). There is thus no ball raceway on
the screw.
Precision screws with higher leads,
however, are 2-start or 4-start
(Figs. 2 and 3).
“Reinforced seals” for precision screws
Fig. 2
are optionally available. This version can
Seal for the 2-start precision
be identified by the opal-green coloring of
screw with medium lead
the component and the material number.
Low-friction seals for precision screws are
available on request. This version can be
identified by the red-brown coloring of the
component and the material number.
Fig. 3
Seal for the 4-start precision
screw with high lead
Installing the seal
Position the nut on the screw according to
the Figure. Lay the wiper seal with the nose
in the recess and press until it snaps into
the groove. When turning the nut on the
screw, monitor the sealing lip and align it by
pressing on the end face if need be. Please
make sure that the sealing lip does not get
damaged.
Detailed assembly instructions are included
with the delivery.
5 - 10 mm
146
Screw Assemblies | Ball Screw Assemblies BASA
Installation
Installation
Delivery condition
Nut mounting
Individual mounting steps
Normally, Rexroth ball screws are supplied
Carry out installation as follows:
initially greased with Dynalub grease. This
Preloaded single nut double nut
Remove the retaining ring (! mounting
makes possible relubrication using oil or
These versions are always supplied on the
instructions) on one side of the mounting
grease. and cartridges and cans of this
ready-mounted nut unit on the screw.
arbor.
grease are available. If another lubricant
You must not disassemble the nut unit and
is used, you will need to check that it is
the screw. If this is unavoidable, please
compatible with the initial lubrication grease.
contact us.
In special cases, a Ball Screw Assembly
with only a preservative coating can be
ordered and supplied using the appropriate
ordering code.
Note: In the case of Ball Screw
Assemblies with a front lube unit, do
cc
Note
not rotate the nut and the front lube
The selected lubricant must be in the nut
unit from the screw.
before the machine is started.
Single nut with standard backlash
Push the mounting arbor with the nut to the
Cleaning
Single nut with reduced backlash
start of the thread.
Various cleaning agents can be used to
Adjustable-preload single nut
The arbor must be in contact on an axially
degrease and wash the assembly:
backlash-free basis.
--
aqueous cleaning agents
You must only mount the nut unit on an
Now, carefully turn the nut unit onto the
-–
organic cleaning agents
end-machined screw using a mounting
thread with slight axial pressure.
arbor. The screw journal is then used
cc
Note
to center the mounting arbor. In the case
Immediately after cleaning, thoroughly dry
of screw ends of Form “00”, you can use a
all parts and apply a preservative coating or
centering bore “Z” on the end face to place
anti-corrosion oil.
an auxiliary spigot in position for mounting.
In all cases, take care to observe the ap-
The external diameter of the arbor should
propriate legal regulations (environmental
be approximately 0.1 mm less than the root
protection, health and safety at work, etc.)
diameter of the screw. In most cases, you
as well as the specifications for the clean-
can use the supplied arbor with nut units. The
ing agent (e.g. handling).
start of the screw’s thread must be rounded
off carefully to avoid damage to the seal and
the individual inner parts of the nut unit.
Do not remove the mounting arbor until the
nut unit is located completely on the screw
Storage
thread.
Ball Screw Assemblies are high-quality
systems that must be treated with due care.
In order to prevent damage and contamina-
tion, the elements should not be removed
from the protective wrapping until immedi-
ately before installation. Once they have
been removed from the packaging, they
must be set down on V-shaped cradles.
The individual mounting steps are
described below.
Disassembly is carried out in the reverse
order. Be particularly careful; otherwise, the
nut or its individual internal parts could be
damaged, which would lead to premature
failure of the Ball Screw Assembly.
147
Installation
Steel/aluminum and aluminum/aluminum
Preloading of the adjustable-
Installation in the machine
material pairings
preload single nut
It is not normally necessary to remove the
Screw
Tightening torque (Nm)
Measuring of the dynamic drag torque with
preservative coating before installation.
diameter
Strength classes as per
SEM-E-S and SEM-E-C.
--
If the Ball Screw Assembly is
(mm)
DIN ISO 898
Use an adjusting screw to restrict the
contaminated, you must clean it first
8.8
10.9
12.9
clearance of the nut that is ready-mounted
(see “Cleaning”) and re-oil it
M3
1.2
1.2
1.2
on the screw such that the dynamic drag
--
Push the nut unit into the mounting bore,
M4
2.4
2.4
2.4
torque Tp0 achieves the value in the table
taking care to avoid any impact force or
M5
4.8
4.8
4.8
! page 140 (with the Ball Screw Assem-
misalignment.
M6
8.5
8.5
8.5
bly lightly oiled).
--
Tighten the mounting screws using a
M8
20.0
20.0
20.0
You must carry out the inspection across
torque wrench if necessary. Maximum
M10
41.0
41.0
41.0
the entire length of the thread; if the values
tightening torque for the steel/steel mate-
M12
70.0
70.0
70.0
are different from the ones in the table,
rial pairing (Rm ≥ 370 N/mm2), see table.
M14
110.0
110.0
110.0
correct the setting.
M16
175.0
175.0
175.0
After you make the setting, the centering
Steel/steel material pairing
M18
250.0
250.0
250.0
diameter D1 must match the values in the
Screw
Tightening torque (Nm)
M20
345.0
345.0
345.0
tables ! page 38 and 40. Cover the
diameter
Strength classes as per
head of the screw with a protective cap.
(mm)
DIN ISO 898
T
pa
= F·r
Tightening torques for fastening screws
Measure value, e.g.
F
8.8
10.9
12.9
according to VDI 2230 where
Set screw
with spring gauge
r
M3
1.3
1.8
2.1
µG = µK = 0.125
M4
2.7
3.8
4.6
M5
5.5
8.0
9.5
M6
9.5
13.0
16.0
Aligning the Ball Screw Assembly
M8
23.0
32.0
39.0
in the machine
M10
46.0
64.0
77.0
A gauge1) with a self-aligning contact pad is
M12
80.0
110.0
135.0
available from Rexroth for easy alignment of
M14
125.0
180.0
215.0
the Ball Screw Assembly.
M16
195.0
275.0
330.0
M18
280.0
400.0
470.0
Tpa
= currently measured dynamic drag
M20
390.0
560.0
650.0
torque
Two pads of different lengths are available
which can be used depending on the screw
Assembly instructions are included with
--
The maximum tightening torques speci-
lead:
each delivery. If you need additional copies,
fied in the table below apply to the steel/
--
Part number R3305 131 19
please ask us.
aluminum or aluminum/aluminum material
length 33 mm for leads < 20
pairings (Rm ≥ 280 N/mm2).
--
Part number R3305 131 21
When driving screws into aluminum, the
length 50 mm for leads > 20
length of thread engagement should be
at least 1.5 times the screw diameter.
Mounting screws
cc
Always make sure the screws
are secure where there are high screw
loads!
1) The dial gauge is not supplied
148
Screw Assemblies | Ball Screw Assemblies BASA
Installation
Installation Tolerances
cc
Note
Any alignment errors can lead to premature failure of the Ball Screw Assembly, which means that they are not allowed!
To ensure that a BASA can actually achieve the calculated service life and performance, its system-related requirements and limitations
must be taken into account at the design stage. Screw assemblies are not suitable for transferring radial forces and torques, such as may
be caused by misalignments during installation. The following sections illustrate the most important principles for achieving designs that will
be compatible with the screw drive system and its requirements.
When using BASAs, the specified installation tolerances must be observed when designing and building the adjoining structures. The first
basic principle is: The higher the BASA’s precision and preload, the more accurate the adjoining structures must be.
This applies in particular to applications in which the nut travels close up to the end bearings since, in this area, the risk of distortive
stresses and therefore of additional loads is very high.
L
2 · d0
//
Y
A
2 · d
0
A
X
A
Parallelism offset and details of the rectangularity between the screw shaft axis and the location face of the nut housing.
L
= distance between end bearings
(mm)
d0
= nominal diameter of screw
(mm)
X
= permissible deviation from rectangularity:
The tolerance applies to a surface that must lie
between two planes spaced at a distance X from
each other which are perpendicular to the reference axis A.
(mm)
Y
= Permissible parallelism offset between the guide
and the Ball Screw Assembly
(mm)
Preload option
X
Y
The adjacent table shows the most important recommended tolerances for Ball Screw Assemblies as a
(mm)
(mm)
function of the preload.
Backlash
0.04
0.04
These tolerances include the rectangularity of the nut housing (or adjoining structure) relative to the
Preloaded
0.02
0.02
screw axis. The tolerances for parallelism between the guide and the Ball Screw Assembly must also
be complied with.
Minimum distance of the nut from the end bearings > 2 • d0
Any alignment errors can lead to premature breakdown of the Ball Screw Assembly!
149
Installation
Lubrication
cc
Do not use greases containing solid particles (e.g. graphite or MoS2)!
cc
If other lubricants are used, this may lead to a reduction in the relubrication intervals, the achievable travel in short-stroke
applications, and the load capacities. Possible chemical interactions between the plastic materials, lubricants and preservative
oils must also be taken into account.
cc
If your application makes greater environmental demands (i.e. cleanroom, vacuum, foodstuff application, strong or aggres-
sive metalworking fluids, or extreme temperatures) please contact us, since a special test, and possibly a special lubricant, will be
required. Please have all information about your application to hand.
cc
When using in other sectors, e.g.: food industry, clean room, vacuum etc. or at extreme temperatures, or if the lubrication is
exposed to process media, the standard initial lubrication and anti-corrosion agents used prior to shipment may not be suitable,
or they may be incompatible with the relubrication lubricant. In this case, please consult us in advance!
cc
Even under normal operating conditions, the system must be relubricated at the latest after 2 years due to aging of the
grease. Please note the reduced load ratings according to the technical notes.
Recommendation:
In general, you should not apply the lubricant all in one go; rather, apply several smaller amounts.
In the case of a short stroke, (stroke ≤ nut length, L), it is advisable to carry out a lubricating stroke more often. In this case, there
is a risk, amongst other things, that low-viscosity lubricants drop out.
Please note the information about reducing the load rating in “"Technical notes"” on page 133.
Please consult our regional centers regarding short stroke applications.
You can find your local contact person at: www.boschrexroth.com/contact

 

 

 

 

 

 

 

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