ServoClass®
Couplings


Servo Motor Sizing

If you wish, you can use the
Sizing Software which will take your information and automatically suggest the correct ServoClass.

 

1. Calculate Servomotor torque (TS)
Although servomotors have different torque values relative to RPM, and torque values change relative to continuous or intermittent duty, it is suggested to use the peak torque rating of the servomotor multiplied by a service factor in determining the coupling selection:

TS is the torque used to select the coupling;
TM is the peak torque of the servomotor;
KS is the servo service factor of the application.

Generally, KS is a value within the range of 1.3 to 1.5 for ServoClass® Coupling applications.
KS = 1.3 for typical reverse-load, continuous-duty applications.
KS = 1.5 for the most demanding high reverse-load, rapid-acceleration applications.

2.Selection
 Using your figure for operating torque (TS), select the appropriate coupling from one of these charts depending on whether you are using the single or double disc model:

 

Single Disc Specifications
  Misalignment
Capacity		  
Size Oper-
ating
Torque
in-lb
Nm		 Maxi
mum
RPM
r/min		 Tor-
sional
Stiff-
ness
in-lb/deg
Nm/rad		 Axial
Stiff-
ness
lb/in
N/mm		 Para
llel
inch
mm		 Ang-
ular
degree		 Axial
+/-inch
+/-mm		 Moment
of
Inertia
lb-in2
kg-m2
x 10-6		 Wgt.
oz.
gm
SD005 4.43
0.5		 10,000 43.3
280		 800
140		 -
-		 .5 0.002
0.05		 0.0009
0.264		 0.245
7
SD010 8.84
1.0		 10,000 34
220		 800
140		 -
-		 1.0 0.004
0.1		 0.0023
0.67		 0.42
12
SD020 13
1.5		 10,000 116
750		 365
64		 -
-		 1.0 0.006
0.15		 0.0068
2.0		 0.88
25
SD030 27
3.0		 10,000 263
1,700		 365
64		 -
-		 1.0 0.008
0.20		 0.0259
7.6		 1.55
44
SD035 53
6.0		 10,000 402
2,600		 320
56		 -
-		 1.0 0.010
0.25		 0.0659
19.3		 2.93
83
SD040 80
9.0		 10,000 541
3,500		 229
40		 -
-		 1.0 0.012
0.30		 0.0922
27.0		 3.21
91
SD050 221
25.0		 10,000 1,328
8,600		 274
48		 -
-		 1.0 0.016
0.40		 0.3594
105.3		 7.80
221
SD060 530
60.0		 10,000 3,398
22,000		 434
76		 -
-		 1.0 0.018
0.45		 1.0679
312.9		 15.87
450
SD080 885.0
100.0		 10,000 6,178
40,000		 314
55		 -
-		 1.0 0.022
0.55		 2.7986
820		 35.27
1,000

Double Disc Specifications
  Misalignment
Capacity		  
Size Oper-
ating
Torque
in-lb
Nm		 Maxi
mum
RPM
r/min		 Tor-
sional
Stiff-
ness
in-lb/deg
Nm/rad		 Axial
Stiff-
ness
lb/in
N/mm		 Para
llel
inch
mm		 Ang-
ular
degree		 Axial
+/-inch
+/-mm		 Moment
of
Inertia
lb-in2
kg-m2
x 10-6		 Wgt.
oz.
gm
SC005 4.43
0.5		 10,000 30.5
200		 399
70		 0.002
0.05		 0.5 0.004
0.1		 0.0013
0.386		 0.35
10
SC010 8.84
1		 10,000 26
170		 399
70		 0.005
0.12		 1.0 0.008
0.2		 0.0031
0.9		 0.56
16
SC020 13
1.5		 10,000 90
580		 182
32		 0.006
0.15		 1.0 0.013
0.33		 0.0103
3.0		 1.23
35
SC030 27
3.0		 10,000 201
1,300		 182
32		 0.007
0.17		 1.0 0.016
0.40		 0.0359
10.5		 2.19
62
SC035 53
6.0		 10,000 309
2,000		 160
28		 0.009
0.22		 1.0 0.020
0.50		 0.0899
26.3		 4.09
116
SC040 80
9.0		 10,000 417
2,700		 114
20		 0.009
0.22		 1.0 0.024
0.60		 0.1299
38.0		 4.62
131
SC050 221
25		 10,000 973
6,300		 137
24		 0.010
0.27		 1.0 0.031
0.80		 0.4931
144.3		 10.65
302
SC060 530
60.0		 10,000 2,780
18,000		 218
38		 0.013
0.34		 1.0 0.035
0.90		 1.3089
383.5		 19.40
550
SC080 885
100.0		 10,000 5,097
33,000		 157
27		 0.020
0.52		 1.0 0.043
1.10		 3.6860
1,080		 42.30
1,200

 

3. Check dimensions and bore ranges for your selection from one of these charts depending on whether you are using the single or double disc model:

Single Disc Dimensions Chart
  Bore
d1 & d2		  
Size Min
inch
mm		 Max
inch
mm		 Outside
Diameter
D		 Overall
Length
L		 Hub
Length
LB		 Spacer
Gap
S		 Clamp
Screw
Size
M
SD005 0.157
4.0		 0.236
6.0		 0.63
16.0		 0.63
16.0		 0.295
7.5		 0.039
1.0		 2-M2.0
SD010 0.1875
4.0		 0.250
7.0		 0.75
19.0		 0.78
19.9		 0.35
9.0		 0.075
1.9		 2-M2.5
SD020 0.250
5.0		 0.375
10.0		 1.02
26.0		 0.93
23.5		 0.41
10.5		 0.098
2.5		 2-M2.5
SD030 0.250
6.0		 0.500
14.0		 1.34
34.0		 1.07
27.1		 0.47
12.0		 0.122
3.1		 2-M3.0
SD035 0.375
8.0		 0.625
16.0		 1.54
39.0		 1.34
34.1		 0.59
15.0		 0.161
4.1		 2-M4.0
SD040 0.375
8.0		 0.750
19.0		 1.73
44.0		 1.34
34.1		 0.59
15.0		 0.161
4.1		 2-M4.0
SD050 0.4375
10.0		 1.000
25.0		 2.20
56.0		 1.77
45.0		 0.79
20.0		 0.197
5.0		 2-M5.0
SD060 0.625
15.0		 1.125
30.0		 2.68
68.0		 2.13
54.0		 0.95
24.0		 0.240
6.0		 2-M6.0
SD080 0.8125
20.0		 1.375
35.0		 3.23
82.0		 2.99
76.0		 1.18
30.0		 0.320
8.0		 2-M8.0
Double Disc Dimensions Chart
  Bore
d1 & d2		  
Size Min
inch
mm		 Max
inch
mm		 Outside
Diameter
D		 Overall
Length
L		 Hub
Length
LB		 Center
Member
LC		 Spacer
Gap
S
Clamp
Screw
Size
M
SC005 0.157
4.0		 0.236
6.0		 0.63
16.0		 .87
22.0		 0.295
7.5		 0.20
5.0		 0.039
1.0		 2-M2.0
SC010 0.1875
4.0		 0.250
7.0		 0.75
19.0		 1.08
27.5		 0.35
9.0		 0.20
5.0		 0.089
2.25		 2-M2.5
SC020 0.250
5.0		 0.375
10.0		 1.02
26.0		 1.26
32.0		 0.41
10.5		 0.24
6.0		 0.098
2.5		 2-M2.5
SC030 0.250
6.0		 0.500
14.0		 1.34
34.0		 1.46
37.0		 0.47
12.0		 0.28
7.0		 0.118
3.0		 2-M3
SC035 0.375
8.0		 0.625
16.0		 1.54
39.0		 1.85
47.0		 0.59
15.0		 0.35
9.0		 0.158
4.0		 2-M4
SC040 0.375
8.0		 0.750
19.0		 1.73
44.0		 1.85
47.0		 0.59
15.0		 0.36
9.0		 0.158
4.0		 2-M4
SC050 0.4375
10.0		 1.000
25.0		 2.20
56.0		 2.40
61.0		 0.79
20.0		 0.43
11.0		 0.20
5.0		 2-M5
SC060 0.625
15.0		 1.125
30.0		 2.68
68.0		 2.91
74.0		 0.95
24.0		 0.55
14.0		 0.240
6.0		 2-M6.0
SC080 0.8125
20.0		 1.375
35.0		 3.23
82.0		 3.86
98.0		 1.18
30.0		 0.87
22.0		 0.320
8.0		 2-M8.0

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The right to make engineering refinements on all products is reserved.
Dimensions and other details subject to change.
When dimensions are critical, detailed drawings should be obtained from the factory.

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