MINUTES OF THE CEMA ENGINEERING CONFERENCE IDLER COMMITTEE MEETING

Tuesday, June 27, 2017

1. The Idler Committee meeting convened at 8:42 am lead by Jarrod Felton, Superior Industries (Chair Conveyor Idler Committee).

2. Attendance sheets were sent around the room and each person in attendance introduced themselves and what company they represented. There were 45 people in attendance. See attached attendance rosters.

3. Agenda was approved with addition of adding to the agenda to approve the agenda. Prior

Conveyor Idler Committee meeting minutes from June 21, 2016 were discussed and approved. Comments to correct item 6 of the Fall 2016 meeting minutes dated Tuesday, September 20, 2016 were discussed. It was decided to correct item 6 of these meeting minutes from “Phil added draft to the current belt book.” to “Phil will add draft to the next edition of the Belt Conveyors for Bulk Materials book”.

4. Old Business

a. CEMA G Idler dimensions: Review simplified dimensional survey results. The CEMA G Idler dimensional survey was sent out prior to this meeting and responses were received from 4 companies. One response looked to be an error as the dimension for the overall length of the trougher C MAX was the same for all belt widths in the survey response. Discussion was started on what to do next. This discussion began with a short review on why the survey for CEMA G dimensions. Main points were the OR’s (Official Representatives) asked for emerging technologies as it was recognized that conveyor capacitates were getting larger and belt widths were getting wider. This created a need for idlers with larger capacities than the CEMA F idler. Previous years had recommended load ratings for the CEMA G idler which were approved and added to the current ANSI/CEMA Standard 502 released in 2016. A proposal was made to create a subcommittee to condense the survey information into the format of the idler standard for the fall CEMA meeting. This motion was approved with Paul Schmidgall volunteering to be the Chair of this subcommittee. Shown is a list of the volunteers for this committee. Sub-Committee: Paul Schmidgall, Superior Industries (Chair) (p.schmidgall@superior-ind.com); Tom Hubbert, Syntron (tom.hubbert@syntronmh.com); Benjamin Brewer,

Conveyor Equipment Manufacturers Association

Douglas Mfg. (bbrewer@douglasmanufacturing.com); Jim Masek, PPI (jmasek@ppi-global.com).

b. High Speed Conveying. i. TIR survey. The latest TIR survey did not yield any results.

ii. Review of any further information from other standards. Information was presented by Jim Masek covering current standards for TIR from CEMA 502-2016, ABNT BNR 6678-2010, BIS IS 8598 2014 DRAFT, DIN 22112-2 and SANS 1313-3 2012. In general only the BIS IS 8598 2014 DRAFT changes the TIR requirement for different belt speeds. (attached) Additional aspects and topics of high speed conveying were discussed:

• Noise • Roundness of the idler roll • Dynamic Balance of the idler roll • Surface finish of the idler roll • Stiffness of the idler frame • Stiffness of the structure • Assembly tolerances and alignment of the structure and components

It was discussed to continue this investigation and identify what factors are important for high speed conveying. Question was presented if CEMA can fund a study for this. A motion was made and passed to keep a subcommittee to continue to investigate idlers on high speed conveyors. Jim Masek, PPI (jmasek@ppi-global.com) volunteered to Chair this committee. Sub-Committee: Tom Hubbert, Syntron (tom.hubbert@syntronmh.com); Paul Ormsbee, Overland Conveyor (ormsbee@overlandconveyor.com); Paul Schmidgall, Superior Industries (p.schmidgall@superior-ind.com); Andrew Jennings, Conveyor Dynamics (Jennings@conveyor-dynamics.com); Robin Stevens, ContiTech North America (robin.steven@ phoenix-cbs.com); Benjamin Brewer, Douglas Mfg. (bbrewer@douglasmanufacturing.com); Luis Estay, Bechtel Mining & Metals (lrestays@bechtel.com); Nick Mackenzie, Rulmeca (nmackenzie@rulmeca.com)

c. 5 roll troughing idlers.

i. Topic to be kept active. Discussion followed about keeping this active and most felt this was useful. Reiterated the addition to the next edition of the Belt Conveyors for Bulk Materials book. Some felt that a standard for unequal roll length idlers would be more useful in the America’s because this is seen more often than 5 roll idlers. No motion was made to create a 5 roll idler standard. It was generally agreed to keep this item on the agenda under old business.

ii. Summary of figure 5.7. It was pointed out that a summary of figure 5.7 for 5 roll idlers is in the Fall 2016 meeting minutes for the Joint Idler and Pulley meeting.

5. New Business: a. Larger headings on load rating tables in 7th edition. Motion was made and passed to

have larger headings in the next edition of the Belt Conveyors for Bulk Materials book. b. Research into localized belt indentation issues in CEMA G may prompt a minimum roll

diameter. Discussion concerning belt failure problems with load ratings CEMA G Idlers. With the current load ratings, does this lead to a minimum idler roll diameter requirement? It was recognized that this is a belt question and would need to be answered by technical members that manufacture belting. Possible someone who is a member of both CEMA and ARPM would present this to ARPM members to determine if a minimum idler roll diameter is required. Dr. Robin Steven from ContiTech North America volunteered to present this to ARPM.

c. Marketing Whitepaper. CEMA Marketing Committee has asked for each committee to submit a 1 page white paper regarding an aspect of safety. Paul Ross from Douglas Mfg volunteered to submit this paper.

d. Topic was brought up regarding confusion of CEMA standards and International standards such as DIN and ISO. CEMA standards show frame and overall dimensions and do not standardize rolls or shaft ends while International standard show roll and shaft end details and dimensions. This confusion can lead to customers using these standards to just go away from CEMA and to something they are familiar with. How does CEMA continue to be a leader in the world and is there a way to eliminate this confusion. Possible solutions to help eliminate confusion:

• Create a roll standard • Explain the differences in the standards and that most or all CEMA member

companies can manufacture rolls and shaft end details to their specification. • In addition to overall load ratings create roll only load ratings.

e. Topic was brought up regarding a research paper derating of L10 life of tapered roller

bearings. Was this a CEMA research paper? Possible done in the 1970’s?

f. Question was asked about providing running temperature for an idler bearing. What is normal and what is the maximum temperature? This lead to discussion regarding idler roll monitoring of noise and temperature. Can CEMA give any direction for these questions that end users are asking about?

6. Next meeting is June 26, 2018 at La Playa Hotel, Naples, FL

7. Motion to adjourn was made and seconded. The meeting adjourned at approximately 10:10 am.

Respectfully submitted, Jim Masek, Vice-Chair Conveyor Idler Committee

Belt 

Width

A

Std BaseBelt Width

A

Std Base

1 2 3 4 1 2 3 4

72 81 12 9 9.375 10 72 81 76.25 77.75 78

78 87 12 11.5 9.375 10 78 87 82.25 83.75 84

84 93 12 11.5 9.375 10 84 93 88.25 89.75 9090 99 12 11.5 9.375 10 90 99 94.25 95.75 96

96 105 12 11.5 9.375 10 96 105 100.25 101.75 102

102 111 12 11.5 9.375 10 102 111 106.25 107.75 108

108 117 12 11.5 9.375 10 108 117 112.25 113.75 114114 123 12 11.5 9.375 10 114 123 118.25 119.75 120

120 129 12 11.5 9.375 10 120 129 124.25 125.75 126

Belt 

Width

A

Std Base

1 2 3 4

72 81 85.5 83 83 85.5 Companies 1 2 3 4

78 87 91.5 89 89 91.5 7 7 7 7

84 93 97.5 95 95 97.5

90 99 103.5 101 101 103.5

96 105 109.5 107 107 109.5 Companies 1 2 3 4

102 111 115.5 113 113 115.5 0.75 0.75 0.75 0.75

108 117 121.5 119 119 121.5

114 123 127.5 125 125 127.5

120 129 133.5 131 131 133.5

Belt 

Width

A

Std Base

1 2 3 4

72 81 14.5 12 14.5 14.5

78 87 14.5 14.5 14.5 14.5

84 93 14.5 14.5 14.5 14.5

90 99 14.5 14.5 14.5 14.5

96 105 14.5 14.5 14.5 14.5

102 111 14.5 14.5 14.5 14.5

108 117 14.5 14.5 14.5 14.5

114 123 14.5 14.5 14.5 14.5

120 129 14.5 14.5 14.5 14.5

CEMA CLASS G RETURN IDLERS

C Max.

B

D Max.

Companies

Companies

Companies

F Max.

E Drop

Bolt Size

Companies

CEMA G RETURN CONSOLIDATED

0.75

1 2 3 4 1 2 3 4

20 22.5 21.563 21.44 20

35 28.75 27.5 27.50 35

45 32.25 30.938 31.06 45

20 24 22.938 23.56 20

35 31.188 29.75 30.62 35

45 35.313 33.75 34.69 45

20 25.5 24.313 25 20

35 33.75 32.063 33.06 35

45 38.375 36.625 37.75 45

20 27 25.625 26.50 2035 36.125 34.375 35.56 35

45 41.375 39.438 40.75 45

20 28.375 27 27.94 20

35 38.625 36.625 37.94 35

45 44.375 42.5 43.75 45

1 2 3 4 1 2 3 4

20 23 22 21.88 20

35 29.125 27.875 27.81 35

45 32.625 31.313 31.31 45

20 24.438 23.375 24 20

35 31.625 30.188 30.94 35

45 35.625 34.125 34.94 45

20 26 24.75 25.44 20

35 34.125 32.5 33.38 35

45 38.75 36.938 37.94 45

20 27.438 26.125 26.94 20

35 36.5 34.75 35.88 35

45 41.75 39.75 41 45

20 28.875 27.5 28.38 20

35 39 37.063 38.31 35

45 44.75 42.625 44 45

Bolt Size

13.875

13.313

13.313

13.375

13.375

13.375

K ± 1/4

Ø 8

13.813

13.813

13.875

13.875

12.5

12.5

12.5

13

CEMA CLASS G TROUGHING IDLERS

Companies

72

84

96

108

120120

Companies

72

84

96

108

108

120

Belt 

Width

Trough 

Angle

Belt 

Width

Trough 

Angle

E Max

Ø8

96

Companies

Ø7

108

120

84

96

Belt 

Width

Trough 

Angle

72

E Max K ± 1/4

Ø 7

Companies

72

84

12.5

12.5

Belt 

Width

Trough 

Angle

13

13

13

13

12.38

13

13

13.06

13.06

12.88

13.50

13.50

13.56

13.56

CEMA G TROUGH A CONSOLIDATED

Std. Base Wide Base

1 2 3 4 1 2 3 4

20 78.125 77.188 76.94 72 81 87 90.38 88.188 88

35 71.625 69.625 70 84 93 99 90.38 99.813 100

45 65.375 63.938 64.06 96 105 111 90.38 111.1875 112.50

20 90.375 88.688 89.19 108 117 123 90.38 122.6875 125

35 82.813 80.125 81.19 120 129 135 90.38 134.25 137.50

45 75.625 73.625 74.31

20 102.563 100.125 101.44

35 94 90.625 92.38 Std. Base Wide Base

45 85.875 83.188 84.62 1 2 3 4

20 114.813 111.688 113.62 72 81 87 90.38 89.5 94

35 105.25 101.25 103.62 84 93 99 90.38 101.5 106

45 96.125 92.938 94.88 96 105 111 90.38 113.5 118.50

20 127 123.25 125.88 108 117 123 90.38 125.5 131

35 116.5 111.813 114.81 120 129 135 90.38 137.5 143.50

45 106.375 102.563 105.12

Std. Base Wide Base

1 2 3 4

72 81 87 12 10.5 10

84 93 99 12 10.5 10

96 105 111 12 10.5 10

108 117 123 12 10.5 10

120 129 135 12 10.5 10

Std. Base Wide Base

1 2 3 4

72 81 87 15 15 14.50

84 93 99 15 15 14.50

96 105 111 15 15 14.50

108 117 123 15 15 14.50

120 129 135 15 15 14.50

Belt 

Width

AD Max

Companies

Belt 

Width

A

Companies

B

Std. Base

C Max

C Max

Wide Base

Companies

Companies

Belt 

Width

Belt 

Width

ATrough 

Angle

A

H Max

Ø All

Companies

72

84

96

108

120

Belt 

Width

CEMA G TROUGH A CONSOLIDATED

0.75

1 2 3 4 1 2 3 4

20 22.5 21.563 20

35 28.75 27.5 35

45 32.25 30.938 45

20 24 22.938 20

35 31.188 29.75 35

45 35.313 33.75 45

20 26.5 24.313 20

35 34.75 32.063 35

45 39.375 36.625 45

20 28 25.625 2035 37.125 34.375 35

45 42.375 39.438 45

20 29.375 27 20

35 39.625 36.625 35

45 45.375 42.5 45

1 2 3 4 1 2 3 4

20 23 22 20

35 29.125 27.875 35

45 32.625 31.313 45

20 24.438 23.375 20

35 31.625 30.188 35

45 35.625 34.125 45

20 27 24.75 20

35 35.125 32.5 35

45 39.75 36.938 45

20 28.438 26.125 20

35 37.5 34.75 35

45 42.75 39.75 45

20 29.875 27.5 20

35 40 37.063 35

45 45.75 42.625 45

14.875 13

14.875 13

Ø 8

13.813

K ± 1/4

13.813 13

13

E Max

Ø 7

E Max

108

120

84

96 14.875 13

Belt 

Width

Trough 

Angle

Companies

72

108

120 12.5

12.514.375

14.375

12.513.313

14.375 12.5

Belt 

Width

Trough 

Angle

Companies

72

K ± 1/4

Ø 7

12.513.313

Bolt Size

CEMA CLASS G TROUGHING IDLERS

108

120

84

96

Belt 

Width

Trough 

Angle

72

96

108

Companies

Belt 

Width

Trough 

Angle

Companies

Ø 8

120

72

84

84

96

CEMA G TROUGH B CONSOLIDATED

Std. Base Wide Base

1 2 3 4 1 2 3 4

20 78.125 77.188 72 81 87 90.375 88.1875

35 71.625 69.625 84 93 99 90.375 99.8125

45 65.375 63.938 96 105 111 90.375 111.188

20 90.375 88.688 108 117 123 90.375 122.688

35 82.813 80.125 120 129 135 90.375 134.25

45 75.625 73.625

20 102.563 100.125

35 94 90.625 Std. Base Wide Base

45 85.875 83.1875 1 2 3 4

20 114.813 111.688 72 81 87 90.375 89.5

35 105.25 101.25 84 93 99 90.375 101.5

45 96.125 92.9375 96 105 111 90.375 113.5

20 127 123.25 108 117 123 90.375 125.5

35 116.5 111.813 120 129 135 90.375 137.5

45 106.375 102.563

Std. Base Wide Base

1 2 3 4

72 81 87 12 10.5

84 93 99 12 10.5

96 105 111 12 10.5

108 117 123 12 10.5

120 129 135 12 10.5

Std. Base Wide Base

1 2 3 4

72 81 87 15 15

84 93 99 15 15

96 105 111 15 15

108 117 123 15 15

120 129 135 15 15

Companies

Companies

B

Belt 

Width

AD Max

Belt 

Width

A C Max

Wide Base

Companies

Belt 

Width

A

Belt 

Width

A

Companies

C Max

108

120

84

96

Belt 

Width

Trough 

Angle

Companies

72

H Max

Ø All Std. Base

CEMA G TROUGH B CONSOLIDATED

0.75

1 2 3 4 1 2 3 4

20 22 21.5625 20

35 28.25 27.5 35

45 31.75 30.9375 45

20 23.5 22.9375 20

35 30.688 29.75 35

45 34.813 33.75 45

20 25.938 24.3125 20

35 34.188 32.0625 35

45 38.813 36.625 45

20 27.438 25.625 20

35 36.563 34.375 35

45 41.813 39.4375 45

20 28.813 27 20

35 39.063 36.625 35

45 44.813 42.5 45

1 2 3 4 1 2 3 4

20 22.5 22 20

35 28.625 27.875 35

45 32.125 31.313 45

20 23.938 23.375 20

35 31.125 30.188 35

45 35.125 34.125 45

20 26.438 24.75 20

35 34.563 32.5 35

45 39.188 36.938 45

120 13.813 12.5

96 14.313 13

84 13.313 13

Belt 

Width

Trough 

Angle

K ± 1/4

Ø 8

Companies

72 13.313 13

108 13.813 12.5

96 13.813 12.5

84 12.813 12.5

E Max

Ø 8

Companies

72

84

96

84

96

108

120

Belt 

Width

Trough 

Angle

Bolt 

Size

CEMA CLASS G TROUGHING IDLERS

Belt 

Width

Trough 

Angle

E Max

Ø 7

Companies

72

Belt 

Width

Trough 

Angle

K ± 1/4

Ø 7

Companies

72 12.813 12.5

CEMA G TROUGH C CONSOLIDATED

20 27.876 26.125 20

35 36.938 34.75 35

45 42.188 39.75 45

20 29.313 27.5 20

35 39.438 37.063 35

45 45.188 42.625 45

Std. Base Wide Base

1 2 3 4 1 2 3 4

20 78.125 77.188 72 81 87 90.375 88.188

35 71.625 69.625 84 93 99 90.375 99.813

45 65.375 63.938 96 105 111 90.375 111.188

20 90.375 88.688 108 117 123 90.375 122.688

35 82.813 80.125 120 129 135 90.375 134.25

45 75.625 73.625

20 102.563 100.125

35 94 90.625 Std. Base Wide Base

45 85.875 83.188 1 2 3 4

20 114.813 111.688 72 81 87 90.375 89.5

35 105.25 101.25 84 93 99 90.375 101.5

45 92.125 92.938 96 105 111 90.375 113.5

20 127 123.25 108 117 123 90.375 125.5

35 116.5 111.813 120 129 135 90.375 137.5

45 106.375 102.563

Std. Base Wide Base

1 2 3 4

72 81 87 12 10.5

84 93 99 12 10.5

96 105 111 12 10.5

108 117 123 12 10.5

120 129 135 12 10.5

Std. Base Wide Base

1 2 3 4

72 81 87 15 15

84 93 99 15 15

96 105 111 15 15

108 117 123 15 15

120 129 135 15 15

Companies

Companies

Belt 

Width

AB

Companies

Belt 

Width

AD Max

Belt 

Width

A C Max

Std. Base

Companies

Belt 

Width

A C Max

Wide Base

120 14.313 13

108 14.313 13

Companies

72

84

96

108

120

108

120

Belt 

Width

Trough 

Angle

H Max

Ø All

CEMA G TROUGH C CONSOLIDATED

0.75

1 2 3 4 1 2 3 4

20 22.125 21.563 20

35 27.625 27.5 35

45 31 30.938 45

20 23 22.938 20

35 29.438 29.75 35

45 33.313 33.75 45

20 24.875 24.313 20

35 32.25 32.063 3545 36.625 36.625 45

20 26.188 25.625 20

35 34.5 34.375 35

45 39.5 39.438 45

20 27.563 27 20

35 37.25 36.625 35

45 42.313 42.5 45

1 2 3 4 1 2 3 4

20 22.563 22 20

35 28.063 27.875 35

45 31.375 31.313 45

20 23.313 23.375 20

35 30.375 30.188 35

45 34.188 34.125 45

20 25.313 24.75 20

35 32.625 32.5 35

45 37 36.938 45

20 26.688 26.125 20

35 34.938 34.75 35

45 39.813 39.75 45

20 28.063 27.5 20

35 36.813 37.063 35

45 42.688 42.625 45

Bolt Size

Companies Companies

72 72 13.375

CEMA CLASS G TROUGHING IDLERS

Belt 

Width

Trough 

Angle

E Max Belt 

Width

Trough 

Angle

K ± 1/4

Ø 7 Ø 7

96 96 13.375 12.5

84 84 13.375 12.5

12.5

108 108 13.375 12.5

120 120 13.375 12.5

Companies Companies

72 72 13.875

Belt 

Width

Trough 

Angle

E Max Belt 

Width

Trough 

Angle

K ± 1/4

Ø 8 Ø 8

96 96 13.875 13

84 84 13.875 13

13

108 108 13.875 13

120 120 13.875 13

CEMA G TROUGH D CONSOLIDATED

Std. Base Wide Base

1 2 3 4 1 2 3 4

20 73 77.188 72 81 87 82.5 88.188

35 67 69.625 84 93 99 94.5 99.813

45 61.5 63.938 96 105 111 106.5 111.188

20 84.5 88.688 108 117 123 118.5 122.688

35 77.75 80.125 120 129 135 130.5 134.25

45 71.25 73.625

20 96 100.125

35 88.25 90.625 Std. Base Wide Base

45 81 83.188 1 2 3 4

20 107.5 111.688 72 81 87 88.5 89.5

35 98.75 101.25 84 93 99 100.5 101.5

45 90.5 92.938 96 105 111 112.5 113.5

20 119 123.25 108 117 123 124.5 125.5

35 109.5 111.813 120 129 135 136.5 137.5

45 100.25 102.563

Std. Base Wide Base

1 2 3 4

72 81 87 11.5 10.5

84 93 99 11.5 10.5

96 105 111 11.5 10.5

108 117 123 11.5 10.5

120 129 135 11.5 10.5

Std. Base Wide Base

1 2 3 4

72 81 87 15 15

84 93 99 15 15

96 105 111 15 15

108 117 123 15 15

120 129 135 15 15

C Max

Ø All Std. Base

Companies Companies

72

84

96Belt 

Width

A

Belt 

Width

Trough 

Angle

H Max Belt 

Width

A

Companies

Belt 

Width

AD Max

Companies

C Max

Wide Base

Companies

108

120

Belt 

Width

AB

CEMA G TROUGH D CONSOLIDATED

CEMAStandard 502-2016

Allowable Steel Roll Run Out

Roll Length (<= 500 RPM)

Diameter Diameter

≤ 5 in (127mm) >5 in (127mm)

inches mm inches mm inches mm

≤21 ≤533 0.032 0.8 0.036 0.9

>21 to 36 >533 to 914 0.036 0.9 0.042 1.1

>36 to 55 >914 to 1397 0.055 1.4 0.065 1.7>55 to 98 >1397 to 2489 0.078 2.0 0.095 2.4

SampleLot Size for Acceptance Modified fromSize Inpection Number ANSI/ASQ Z1.4-2008

26-50 8 0 General Inspection Level II51-90 13 1 Normal Inspection Plan

91-150 20 1 AQL=2.5151-280 32 2 Note: Other samplin sizes281-500 50 3 may be used if so agreed

500-1200 80 5 upon.

CEMA BELT SCALE IDLER STANDARD(1) Roll run-out, mounted 0.015 TIR maximum (all rolls).

ABNTABNT BNR 6678 - 2010

8.5.1 The total deviation (in absolute value) presented by the roll

when turning 360 ° and measured with a dial indicator should not

exceed the values given in Table 35 for rolls up to 400 mm

(15.748 inch) in length. For lengths greater than 400 mm

(15.748 inch) rolls, admits there was an increase of 0.1 mm

(0.004 inch) for each additional 250 mm (9.843 inch) in length.

The measurement should be made as shown in Figure 20.

ø Roll Steel Rubber ø Roll Steel Rubber(mm) (mm) (mm) (inch) (inch) (inch)

63 0.6 - 2.48 0.024 -75 0.6 - 2.95 0.024 -

100 0.7 1.5 3.94 0.028 0.059127 0.9 1.9 5.00 0.035 0.075152 1.1 2.3 5.98 0.043 0.091165 1.1 2.5 6.50 0.043 0.098178 1.3 2.7 7.01 0.051 0.106194 - 2.9 7.64 - 0.114203 1.3 2.9 7.99 0.051 0.114219 1.4 3.3 8.62 0.055 0.130

Note: Other values can be set by agreement between user and manufacturer.

Lot Sample Acceptance RejectionSize Size Number Number

n = Ac = Re =2 - 8 2 0 1

9 - 15 3 0 116 - 25 5 0 1 26 - 90 13 1 291 - 150 20 2 3

151 - 280 32 3 4281 - 500 50 5 6

501 - 1,200 80 7 81,200 - 3,200 125 10 11

3,201 - 10,000 200 14 15

Note 1, This is a sampling plan by regular simple attributes, level II,

NOA = 4 according to ABNT NBR 5426

Note 2, Ac = greater number of defective parts in the sample that

allows acceptance of the lot.Note 3, Re = fewer defective parts in the sample cause the

rejection of the lot.

BIS ISStandard 8598 2014 DRAFT

Table 9

Belt Speed - v (mtr/sec)--> ≤ 3 3 > v ≤ 4 4 > v ≤ 5

Roller length - l (mm) Runout in mm

≥ 750 1.4 1.0 0.8

750 > l ≤ 1200 1.6 1.2 1.0

< 1200 1.8 1.4 1.2

Run-out - The idler roller diameter, measured by a dial test indicator at anypoint along its length when rotated on its own bearing shall not exceed the total indicator reading in respect to belt speed as indicated in Table 9

Table 9Belt Speed - v (feet/min)--> ≤ 591 591 > v ≤ 787 787 > v ≤ 984

Roller length - l (inch) Runout in inch≥ 29.53 0.055 0.039 0.031

29.53 > l ≤ 47.24 0.063 0.047 0.039< 47.24 0.071 0.055 0.047

BIS ISStandard 8598 1987Run-out -- The idler outside diameter, measured by a dial test indicator at any pointalong its length when rotated on its own bearings, shall not exceed the total indicator reading (TIR) of 1.6 mm (0.063 Inch) for idler lengths below 1350 mm (53.15 inch) and 2 mm (0.079 inch) for idler lengths of 1350 mm (53.15 inch) and above.

DINStandard 22112-2

Concentricity Tolerance (mm)

Roll diameter Roll diameter

Roll Length d ≤ 133 d > 133 d ≤ 5.24" d > 5.24"

upto 530 0.5 0.6 0.02" 0.024"

530 upto 900 0.7 0.9 0.028" 0.035"

900 upto 1400 1.3 1.6 0.051" 0.063"

At least 90% of a supply shall be within the stated tolerance

range.Overshoots of up to 20% are permissable for 10% of idlers.

Concentricity Tolerance (mm)Roll diameter

Roll Length d ≤ 133 d > 13390% 10% 90% 10%

upto 530 0.5 0.6 0.6 0.72530 upto 900 0.7 0.84 0.9 1.08900 upto 1400 1.3 1.56 1.6 1.92

At least 90% of a supply shall be within the stated tolerance range.Overshoots of up to 20% are permissable for 10% of idlers.

Concentricity Tolerance (in)Roll diameter

Roll Length d ≤ 5.236 d > 5.23690% 10% 90% 10%

upto 20.866 0.020 0.024 0.024 0.02820.866 upto 35.433 0.028 0.033 0.035 0.04335.433 upto 55.118 0.051 0.061 0.063 0.076

At least 90% of a supply shall be within the stated tolerance range.Overshoots of up to 20% are permissable for 10% of idlers.

SANSStandard 1313-3; 2012

TIR (mm)

Table 10 Roll diameter Roll diameter

Roll Length d ≤ 133 d > 133 d ≤ 5.24" d > 5.24"

≤ 570 0.5 0.7 0.02" 0.028"

570 ≤ 994 0.7 0.9 0.028" 0.035"

994 ≤ 1378 1.3 1.6 0.051" 0.063"

1378 ≤ 2518 1.9 2.3 0.075" 0.091"

Steel Rolls:When a metallic or non-metallic roll with a solid liner is tested in accordance with 7.5, the peripheral run-out shall not exceed the values given below.a) When measured within 25 mm of the end face of the roll: 0.5 mm (0.020")b) When measured at any other point across the face: see table 10.

Covered rolls (rubber-lagged rolls)

When a covered roll (rubber-lagged roll) istested in accordance with 7.5, the peripheral run-out, measured within 25 mm of the end face of the roll, shall not exceed 0.5 mm.

When a covered roll (rubber-lagged roll) istested in accordance with 7.5, the peripheral run-out, measured at any point other than within 25 mm from the end of the roller, shall not exceed the values give in table 10 plus a tolerance(on thickness of the covering (lagging) material), not exceeding0.5 mm. (see SANS 1313-1).