Proper belt tension is essential for optimum power transmission and also for the life of the belt. To ensure optimum V-belt drive operation, it is recommended to check the tension in the belts by measuring the deflection force value (N) with the help of a tension measuring device. Belt tension in most of the drives can be checked with adequate reliability utilizing PIX Belts Tension Tester.

Tension Measurement Procedure

  1. Measure the span-length of the Belt in mm. (refer below sketch drawings)
  2. Tie a string or a thread on the two pulleys along with the length of the Belt and mark the center of the span on the Belt.
  3. Calculate 1.5% of the span (say ‘x’) for Belt length less than 1000 mm and 1.0% of the span for Belt length more than 1000 mm. Adjust lower ring on the tension tester on the millimeter scale to coincide, "x" mm with the lower side of the ring. Adjust lower side of the upper ring at 0.00 N.
  4. Place tension tester at the center of the span of the Belt. Apply force with the help of tension tester perpendicular to the span, till the lower surface of the lower ring touches the string.
  5. Read the deflection force value (N) on the Newton scale by taking reading at the lower side of the upper ring.
  6. Compare the deflection force value (N) with the values given in the Table 'A'. The deflection force value (N) should lie between the minimum and maximum values given in the Table 'A'. (Next page)
  7. Deflection force less than the minimum recommended value in the range indicates an under-tensioned drive & deflection force higher than the maximum recommended value indicates an over-tensioned drive.

Important:

  1. For new Belts the deflection force value (N) should be kept at maximum.
  2. Maximum deflection force value (N) is recommended for pulsating & shock loads.
  3. It is recommended to re-check the Belt tension after approximately 24 hours of running and adjust the tension, if necessary.

Technical Specification

Deflection force required for measuring tension in V-Belt drives
Cross Section Smaller pulley diameter (mm) Condition1
Deflection@1% of span, if span
length is more than 1000mm
Condition2
Deflection@1.5% of span, if span
length is less than 1000mm
Required deflection force ‘F’ at
the centre of span for Belt speed
Required deflection force ‘F’ at
the centre of span for Belt speed
0 m/s to
10 m/s
Range (N)
10 m/s to
20 m/s
Range (N)
< 20 m/s
Range (N)
0 m/s to
10 m/s
Range (N)
10 m/s to
20 m/s
Range (N)
< 20 m/s
Range (N)
WRAPPED - CLASSICAL Belts
Z 50-100
100 & above
4-6
6-9
4-5
6-7
3-4
5-6
5-8
8-12
5-7
8-9
4-5
7-8
A 71-140
140 & above
8-12
12-18
7-10
10-14
6-8
8-12
11-16
16-24
9-13
13-19
8-11
11-16
B 112-200
200 & above
16-24
24-35
13-19
19-29
10-16
16-24
21-32
32-47
17-25
25-39
13-21
21-32
C 180-400
400 & above
31-46
46-70
26-38
38-58
20-31
31-46
41-61
61-93
35-51
51-77
27-41
41-61
D 315-600
600 & above
62-90
90-134
52-76
76-115
42-62
62-90
83-120
120-179
69-101
101-153
56-83
83-120
E 450-915
915 & above
108-160
160-240
90-137
137-205
73-109
109-160
144-213
213-320
120-183
183-273
97-145
145-213
WRAPPED - WEDGE / NARROW Belts
SPZ / 3V 63-95
95 & above
8-12
12-17
7-10
10-16
6-9
9-14
11-16
16-23
9-13
13-21
8-12
12-19
SPA 90-140
140 & above
14-20
20-31
12-17
17-26
10-14
14-22
19-27
27-41
16-23
23-35
13-19
19-29
SPB / 5V 140-265
265 & above
25-36
36-46
20-32
32-41
18-27
27-37
33-48
48-61
27-43
43-55
24-36
36-49
SPC 224-355
355 & above
46-66
66-85
38-58
58-76
32-52
52-70
61-88
88-113
51-77
77-101
43-69
69-93
8V 335-520
520 & above
81-107
107-167
68-90
90-140
56-73
73-113
108-143
143-223
91-120
120-187
75-97
97-151
CUT EDGE - CLASSICAL V-Belts
ZX 40-100
100 & above
5-7
7-10
5-6
7-8
3-5
6-7
6-9
9-14
6-8
9-11
5-6
8-9
AX 63-140
140 & above
9-14
14-21
8-12
12-16
7-9
9-14
12-18
18-28
11-15
15-21
9-12
12-18
BX 90-200
200 & above
18-28
28-40
15-22
22-33
12-18
18-28
25-37
37-54
20-29
29-44
15-25
25-37
CX 140-400
400 & above
36-53
53-81
30-44
44-67
23-36
36-53
48-71
71-107
40-58
58-89
31-48
48-71
CUT EDGE - WEDGE / NARROW V-Belts
XPZ / 3VX 56-95
95 & above
9-14
14-20
8-12
12-18
7-10
10-16
12-18
18-26
11-15
15-25
9-14
14-21
XPA 71-140
140 & above
16-23
23-36
14-20
20-30
12-16
16-25
21-31
31-48
18-26
26-40
15-21
21-34
XPB / 5VX 112-265
265 & above
29-41
41-53
23-37
37-47
21-31
31-43
38-55
55-71
31-49
49-63
28-41
41-57
XPC 180-355
355 & above
53-76
76-98
44-67
67-87
37-60
60-81
71-101
101-130
58-89
89-117
49-80
80-107
Note:

Maximum Belt linear speed (Classical section: up to 30 m/sec, Wedge: up to 42 m/sec, Narrow: up to 45 m/sec

If you would require any additional information, please write an e-mail to us at info@pixtrans.com

Other Accessories

PIX-Service kit
PIX-X'Align® Laser-guided Pulley Alignment Tool
PIX-Digital Tension Meter
PIX-Pulley Gauges
PIX-Belt Length Measurer
PIX-Pentagon Poly-V Belt
Wear Gauge
PIX-X'slit Belt Cutting
Machine
PIX-Belts Profile Gauge

Keilriemen Antriebsriemen Klassische Keilriemen Schmalkeilriemen Zahnriemen Keilrippenriemen DoppelKeilriemen Doppelzahnriemen Breitkeilriemen Hochleistungs-Keilriemen Kfz-Keilriemen Landwirtschaftsriemen Verbundriemen Gartenbauriemen Flankenoffene-Formgezahnt Keilriemen Wartungsfreie Keilriemen Hochleistungs-Antriebsriemen Keilriemen mit Aramid Hochleistungszahnriemen Spezialriemen

PIXTRANS