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KHK Worm Gears Catalogue - KHK - #5

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KHK Technical Information
3. Selecting Worms and Worm Wheels by Precision
The precision standards of KHK stock worms and worm wheels are established by us. The table below indicates the tolerance ranges for our products.
|® Precision of worms(KHK W 001)
KHK established allowable profile and lead errors of worms with precision grades 1 to 4, by using the JIS Standard as reference. Lead errors are measured over one full revolution.
■ Precision Grades of Worms (KHK W 001) (Unit: u m)
|® Overall Length Tolerance of Worms ■ Overall Length Tolerance of Worms
Series
Total length(mm)
Tolerance
KWGDL
uniform
0
- 0.10
SWG
SW
SUW
less than 100
0
- 0.15
over 100
0
- 0.20
KWGDLS KWG
uniform
Normal tolerance
Grade
Error
Module
over m0.4 up toi
over mlup to 1.6
over m1.6 up to 2.5
over m2.5 up to 4
over m4
up to 6
1
Tooth profile error
8
12
16
20
25
Lead error
7
9
11
13
16
2
Tooth profile error
12
16
20
24
29
Lead error
15
18
21
25
28
3
Tooth profile error
16
23
30
37
50
Lead error
20
23
27
33
37
4
Tooth profile error
20
30
40
50
70
Lead error
30
32
38
46
52
■ Overall Length Tolerance of Worms Wheels
Total length(mm)
Tolerance
below 30
0
- 0.05
over 30 up to 50
0
- 0.10
over 50 up to 100
0
- 0.15
over 100
0
- 0.20
© Precision of worm wheels (KHK W 002)
We have established standard grades 1 to 5 of worm wheels using the JIS Standard as reference. The allowable values of Single Pitch Error and Runout Error are defined for each module size and pitch diameter.
■ Precision Grades of Worm Wheels (KHK W 002)
unit:^ m
Over m0.4 up to 1 Over ml up to 1.6 Over m1.6 up to 2.5 Over m2.5 up to 4
Over m4 up to 6
Pitch diameter (mm)
Error
Single pitch error
10
10
11 13
10
13
14
Total composite error
21
24
26 30
34
25
28
31
35
41
27
30 33
37
43
33
36 40
46 53
37
40
45
50
57
Single pitch error
8
8
9 10
12
9
10
12
14
9
10 12
13
15
13 14
16 18
13
14
16
18
20
11
11
Total composite error
30
33
37 42
48
35
39
44
50
57
38
42 46
52
60
46
51 57
64 74
52
57
63
71
80
Single pitch error
11
12
13 15
17
12
14
16
18
20
13
15 16
19
21
16
18 20
23 26
19
20
22
25
29
Total composite error
43
47
53 60
68
50
55
62
71
81
53
59 66
74
85
65
72 81
91 105
74
90
100
115
81
Single pitch error
17
19 21
24
19
22
25
29
115
19
21 23
26
30
25 28
32 37
26
105
28
32
35
40
Total composite error
66
74 83
95
77
87
99
75
83 92
105
120
100 115
130 145
115
125
140
160
Single pitch error
21
24
26 30
34
25
28
31
35
41
27
30 33
37
43
33
36 40
46 53
37
40
45
50
57
Total composite error
86
94
105 120
135
100
110
125
140
165
105
120 130
150
170
130
145 160
185 210
150
160
180
200
230
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