index Introduction to Rubber Open End Belts 2 Classifications 4 Technical calculation 6 Transmission calculation example 8 Calculation parameters 10

Transcription

1 RUBBER Open end

2 index Introduction to Rubber Open End Belts 2 Classifications 4 Technical calculation 6 Transmission calculation example 8 Calculation parameters 1 Belt installation and feasibility table 11 Belt failures 13 Belt data MXL 14 XL 16 L 18 H 2 RPP3 22 RPP5 24 RPP8 26 SILVER5 28 SILVER8 3 STD8 32 Special execution feasibility 34 Fixing plates 35 Useful formulas and conversion table 36

3 INTRODUCTION TO RUBBER OPEN END BELTS Megadyne Rubber Open End Belts are rubber based timing belts manufactured with high quality materials and state of the art production process. As a result of this Megadyne offers belts which have been designed to respond the high demands of today s industrial market. Megadyne Rubber Open End Belts are specially suitable for reversing drives and applications when rotational movements need to be transformed into linear motions and high positioning accuracy is required. 2

4 INTRODUCTION TO RUBBER OPEN END BELTS Megadyne Rubber Open End Belts are a great solution when substituting expensive conventional linear systems. Noise level improvement will be obtained as well as economic benefits due to the reduction of the initial investment and the maintenance costs. Taking into account the advantages and the available products range, these belts can be considered as a solution for a very wide field of applications in industrial equipments. Few examples of typical applications can be: Automatic doors for garage Automatic sliding doors X-Y tables on tooling machines Level control on elevators Fitness machines Printers Linear positioning systems STANDARD RANGE MXL XL L H RPP3 RPP5 RPP8 SILVER5 SILVER8 STD8 3

5 CLASSIFICATIONS CLASSIFICATIONS Megadyne Rubber Open End Belts are manufactured in rubber compound. They come from sleeves for spiral cut belts and from press for straight cut belts. The belt is made by: BELT BACK The back side cushion protects the tensile member and permits the use of backside idlers thanks to its elasticity. TENSION MEMBERS Fiberglass tensile member of the latest technology grants the longitudinal rigidity and resistance of the belt. BELT BODY The belt body is made of special polychloroprene-based rubber compound. This compound guarantees the highest tooth share resistance. FABRIC Hard wearing nylon fabric is bonded on tooth surface to improve torque carrying capacity. In addition a special graphite impregnation process gives self-lubricating action and increases drive efficiency. BELT CONSTRUCTION BELT BACK TENSION MEMBERS FABRIC BELT BODY The advantages of Megadyne Rubber Open End Belts are: High positioning accuracy on reverse drives To cover a wide range of applications Low noise level due to vibration absorbing characteristic of rubber Low operation costs due to free of maintenance and long lasting service life Compact and light drives are feasible due to high specific belt performances. 4

6 CLASSIFICATIONS MECHANICAL AND CHEMICAL CHARACTERISTICS Constant dimensions Low pretension Noiseless Constant length Free maintenance High abrasion resistance High flexibility with fiberglass cords Standard working temperature -25 /+8 C Linear speed up to 5 m/s Body Megadyne Rubber Open End Belts are manufactured with polychloroprene compound. Special compounds (different hardness, special properties) are available on request. Here under some compound s characteristics: Resistance to Mineral oils Water Acids / Alkalis Solvents Oils Greases Fuels Environment agents Standard Belt s Resistance LOW MEDIUM NONE NONE LOW MEDIUM NONE MEDIUM Temperature Min T ( C) -25 Max T ( C) 8 Max peak T ( C) 1 IDENTIFICATION CODE Using the information in the table below, it is possible to identify the correct belt for every application. The code is composed of letters and numbers as the following example: 1 2 H + 2 RPP SILVER ) This code composed by letters and numbers indicates the selection of profile. 2) This number indicates the width of the requested belts. The value is in mm for belts with metric pitch and in inches for belts with imperial pitch. 5

7 TECHNICAL CALCULATION LINEAR MOTION BELT m Q a v M t, n 1 F p z 1 z 1 d 1 F u OMEGA LINEAR MOTION BELT c z 1 = z 2 Q m F u a v d 1 d n 1 M t F p The following pages contain data, formulae and tables that are required to design a new belt drive. For critical and difficult drives, it is raccomended that you contact our Application partment for advice. Symbol Unit finition Symbol Unit finition b mm belt width F p N pretension L mm belt length F u N peripheral force c mm centre distance N/cm transmittable force per tooth per unit d i mm pitch diameter of pulley i M t Nm drive torque m kg total conveyed mass n 1 1/min revs/min (RPM) a m/s 2 acceleration P kw drive power v m/s belt speed Q N force exerted by mass (m) C s - safety factor z i number of on pulley i g m/s 2 gravity (9.81) z m number of in mesh on driver pulley µ - coefficient of friction (1) z s number of on small pulley p - belt pitch z L number of on largest pulley MTL N Max Traction Load BS N Breaking Strength Max Traction Load is maximum acceptable traction on cords Breaking Strength is necessary load to break belt cord (1) Between the belt and the guide USEFUL FORMULAE AND CONVERSION FACTORS V = d 1 n n 1 = V 191 d 1 d 1 = V 191 n 1 Q = m g P = M t n M t = 955 P n 1 M t = F u d 1 2 6

8 TECHNICAL CALCULATION CALCULATION OF THE PERIPHERAL FORCE ON THE TIMING BELT Knowing mass For horizontal & conveying drives F u = (m a) + (m g μ) For vertical drives F u = (m a) + (m g) Knowing drive torque F u = 2 M t /d 1 Knowing drive power F u = 19,1 1 6 P/(d 1 n 1 ) BELT WIDTH AND PROFILE ESTIMATION With the result of F u select the belt type profile and approximate the belt width according to DIAGRAM 1 page 1 on Belt width selection. CHOICE OF PULLEYS Choose the closest standard pulley according to the data sheet of each belt type z = π d 1 n p 1 = 6 v p z 1 Always verify that the chosen z is higher or equal to z min written in belt data pages. DETERMINATION OF BELT WIDTH The belt width b should be calculated using the following formula b = F u F s 1 F p, spec z m where: F u from above calculation F s is the safety factor from page 1 F p, spec is the transmittable force per tooth per cm, from belt data pages z m is the number of in mesh on driver pulley, that you can calculate as per below: z m ={ [,5 4 p (z l z s )]} 79 c z s This value z m can t be higher than 12. From the calculated width b, choose the next higher available width; you can check available widths in belt data page. PRE-TENSIONING The suggested installation tension is F p = 2 F u MESHING CHECK In order to guarantee the correct function of the drive check the safety factor against break as per below: σ BS = BS F p 2 F u + where: BS is the Breaking Strength (see tables on belt data pages) F u from above calculation F p is the tension, from above calculation The σ BS outcoming value has to be higher than 11. If it is lower, please retry with the next wider belts till you will get a value higher than 11. ELONGATION You can find belt elongation from Belt Elongation diagrams in belt data pages at Load equal to F p /2 using the formula: Δ l/ = Belt s Max Elongation F p /2 BS 7

9 TRANSMISSION CALCULATION EXAMPLE DRIVE CALCULATION PROCEDURE FOR HORIZONTAL CONVEYING DRIVES DRIVE DATA Type of application Automatic door Type of load Low fluctuation load Hours of daily service 12 hours sired pulley pitch diameter d 1 = 38,2 mm Centre distance c = 3 m Mass to carry m = 1 kg Coefficient of friction μ =,3 Speed v = 1,5 m/s Acceleration a = 1,5 m/s 2 celeration a b = 1,5 m/s 2 F p z 1 m F u Q c a v z 1 M t, n 1 d 1 CALCULATION OF THE PERIPHERAL FORCE ON THE TIMING BELT Since the mass is known, F u can be calculated: F u = m a + m g μ = 1 1, ,8,3 = 444 N BELT WIDTH AND PROFILE ESTIMATION With the result of F u select the belt type profile and approximate the belt width according to DIAGRAM 1 page 1 on Belt width selection. The first estimation is for a RPP5M15. CHOICE OF PULLEYS Knowing the pitch diameter where 14 is z min as per belt data page. z 1 = π d 1 p = π 38,2 = 24 > 14 5 Always verify that the chosen z is higher or equal to z min written in belt data pages. Knowing the linear speed n 1 = 6 V p z 1 = 6 1, = 75 rpm DETERMINATION OF BELT WIDTH To calculate the belt width b we need to find out the service factor F s first: where: F 1, from table page 1, according to input data F 2 = 1 because z m = z 1 2 = 24 2 = 12 F 3 = because n 2 / n 1 = 1 F 4 = because no reverse bending F s = F 1 + F 3 + F 4 F 2 = 1, = 1,4 Then, the belt width b should be calculated using the following formula b = F u F s 1 F p, spec z m = 444 1,4 1 28,5 12 = 12,17 mm 8

10 TRANSMISSION CALCULATION EXAMPLE We will choose the next higher available width: 2 > 18,7 PRE-TENSIONING The suggested installation tension is F p = 2 F u = = 888 N MESHING CHECK σ BS = BS F U + F = p = 8,76 This value is lower than 11, that is the required minimum. Because of this you should check with the next wider available belt, that is 25 mm. This is the correct width as demonstrated by below calculation σ BS = BS F U + F p 2 = 1115 = 12, where 1115 is the BS for a RPP5M25. ELONGATION From Belt Elongation diagram at page 24 we will find: Belt s Max Elongation Δ l/ = = BS where Max Elongation is for the elongation of the specific length at BS. F p 2 3, =,12 mm FINAL SELECTION The selected belt is RPP5M25. 9

11 CALCULATION PARAMETERS SERVICE FACTOR F s : Service Factor F 1 : Load Factor F 2 : Teeth in mesh Factor F 3 : Ratio Factor F 4 : Reverse Bending Factor F s = F 1 + F 3 + F 4 F 2 LOAD FACTOR (F 1 ) Teeth in mesh FACTOR (F 2 ) Uniform load 1, Daily service in hours 3-8 hours 8-16 hours hours With low peak load 1,2 1,4 1,6 With high peak load 1,5 1,7 1,9 With very high peak load 1,8 2, 2,2 Teeth in mesh F , 1,8 8,6 6,4 RATIO FACTOR (F 3 ) Speed ratios F 3 1 / 1,24 1,25 / 1,74,1 1,75 / 2,49,2 2,5 / 3,49,3 3,5 and above,4 REVERSE BENDING FACTOR (F 4 ) with reverse by back idler F 4,2 BELT WIDTH SELECTION F u (N) DIAGRAM Width (mm) SLV8 RPP8 STD8 SLV5 H RPP5 RPP3 XL L MXL 1

12 BELT INSTALLATION AND FEASIBILITY TABLE PROCEDURE TO MEASURE The procedure to measure the tension of the belt is to use a Belt Tension Gauging Equipement. This device consists of a small sensing head which is held across the belt to be measured. The belt is then tapped to induce the belt to vibrate at its natural frequency. The vibration are detected and the frequency of vibration is then displayed on the measuring unit. The relation between belt static tension (T S ) and frequency of vibration (f) may be calculated using the following formula: f = 1 2t T s m Where : T S = static tension (N) m = Belt mass per unit length (kg/m) or T s = 4 m t 2 f 2 f = Frequency of vibration in Hertz (Hz) t = Free belt span length in meters (m) BELT AND PULLEY ALIGNEMENT For a correct system functioning and to increase belt life, it is necessary a correct pulley installation: pulleys have to be parallel and aligned as shown in drawing 1 (correct configuration). If pulleys are not parallel as in drawing 2, belt could fall during functioning and this can provoke damages to the complete equipment. To grant a correct belt running α and Δx must be as smaller as possible. For more information, please contact our technical staff. α Δx Drawing 1 Drawing 2 Drawing 3 11

13 BELT INSTALLATION AND FEASIBILITY TABLE In omega application to grant good mesh between pulley and and to respect belt flexibility avoiding excessive stress on cords, distance d (as drawing 4) has to be: Q m F u a v d = 4 belt width Suggested angle 12 d 1 d n 1 M t F p drawing 4 FEASIBILITY TABLE MEGADYNE manufactures a wide range of Rubber Open End Belts. In the next table a general overview is shown of the today range of products and their main characteristics. For any special belt version which might not be included, please do not hesitate to contact our Application partment or check page Special Execution Feasibility. Please consider that special version might have different performance from what declared in belt data pages. Trapezoidal Profile Parabolic Profile Standard Profile MXL XL L H RPP 3M RPP 5M RPP 8M SILVER 5 SILVER 8 STD 8M STANDARD S S S P S P P S S S P = Ex stock (production process: Straight cut) S = Ex stock (production process: Spiral cut) 12

14 BELT FAILURES Excessive Belt Wear Belt Damages Drive Function Problems Problems Causes Correction Action Unexpected wear along the complete tooth width. Unexpected wear on one side of the tooth only. Tooth bottom shows wear. Tooth root shows signs of wear. The flanks of the belt show clear signs of wear. Damaged belt tensile member. Torn tooth along the belt. Rupture of tensile member. Breaks or cracks in the back side of the belt. Softening of the top surface of the belt. Apparent elongation of the belt. Belt overriding the pulley flanks. Excessive wear on the pulley. Drive excessively noisy. Belt overload. Incorrect pulley execution. Incorrect pulley alignment. Excessive belt installation tension. Incorrect pulley execution. Incorrect diameter of pulley. Incorrect pulley execution. Misalignment or wrong setting of pulleys. Oscillation of the axes and/or of the bearings. Flanks bent. Diameter of pulley is below specified minimum. Excessive moisture. Too few in mesh on the motor pulley. Belt overload. Incorrect pulley execution. Belt overload. Diameter of pulley is below specified minimum. Tooth jump due to missing belt installation tension. Exposure to temperatures which are out of the admissible temperature range. Diameter of pulley is below specified minimum. Excessive exposure to UV radiation. Operation with excessive amount of oil. Reduction of centre distance due to bearings not being firmly fixed. Faulty installation of the flanks. Misalignment of pulleys. Excessive overloading. Excessive belt installation tension. Pulley material insufficient hard. Pulleys out of line. Excessive belt installation tension. Incorrect pulley execution. Use a wider belt. Use a belt of a higher performance class. Control pulley dimensions and replace if necessary. Control and adjust pulley alignment. Calculate and adjust the belt tension. Control pulley dimensions and replace if necessary. Control pulley dimensions and replace if necessary. Control pulley dimensions and replace if necessary. Control pulley dimensions and replace if necessary. Correct the positioning of the pulleys and reinforce the bearings. Straighten flanks. Increase the diameter of the pulleys or use belts and pulleys of smaller pitch. Eliminate the moisture. Increase the number of in mesh by using a bigger pulley. Use a belt of a higher performance class. Increase belt width. Use a belt of a higher performance class or increase belt width. Control pulley dimensions and replace if necessary. Use a belt of a higher performance class or increase belt width. Increase the diameter of the pulleys Calculate and adjust the belt tension. Protect the transmission by extreme temperatures. Increase the diameter of the pulleys. Reduce exposure to UV radiation. Protect the belt from oil. Restore the initial centre distance and strengthen the bearings. Reinstall the flanks properly. Align pulleys. Use a wider belt. Calculate and adjust the belt tension. Harden the pulley surface. Align pulleys. Calculate and adjust the belt tension. Control pulley dimensions and replace if necessary. 13

15 MXL OPEN-END (SPIRAL CUT) BELT CHARACTERISTICS STANDARD WIDTHS (inch) STANDARD WIDTHS (mm) 6,35 7,87 9,39 Weight (gr/m) 8,5 1,5 13, Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,4 mm Standard thickness tolerance: ±,25 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m W 1,14,51 2,32 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (inch) Breaking Strength (N) BELT ELONGATION MXL 37 MXL 31 MXL 25 Load (N) ,2 2,5,,5 1, 1,5 2, 2,5 3, Elongation (%) 14

16 MXL OPEN-END (SPIRAL CUT) TOOTH RESISTANCE (N/cm) MXL RPM (1/min) RPM (1/min) (N/cm) 6, 5,8 5,5 5, 4,5 4, 3,5 3,3 3, FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 12 7,76 7, ,41 7,9 14 9,6 8, ,7 9, ,35 9, , 1, ,64 11, ,29 11, ,94 12, ,58 13, ,23 13, ,52 15, ,82 16, ,11 17,6 3 19,4 18, ,7 2, ,99 21, ,29 22, ,87 25, ,17 26, ,46 27, ,5 3, ,81 38, ,4 41, ,57 46,6 15

17 XL OPEN-END (SPIRAL CUT) BELT CHARACTERISTICS STANDARD WIDTHS (inch) STANDARD WIDTHS (mm) 6,35 7,87 9,39 Weight (gr/m) 14, 17,5 21, Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: -,8/+,4 mm Standard thickness tolerance: ±,25 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m W 2,4 1,27 5,8 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (inch) Breaking Strength (N) BELT ELONGATION XL 37 XL 31 XL 25 Load (N) ,75,,5 1, 1,5 2, 2,5 3, Elongation (%) 16

18 XL OPEN-END (SPIRAL CUT) TOOTH RESISTANCE (N/cm) XL RPM (1/min) RPM (1/min) (N/cm) 1, 9,8 9,5 9, 8, 7,3 6,5 6, 5,8 FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 1 16,17 15, ,79 17, ,4 18, ,2 2, ,64 22, ,26 23, ,87 25, ,49 26, ,11 28,6 19 3,72 3, ,34 31, ,96 33, ,57 35, ,81 38, ,4 41, ,66 43, ,28 44, ,89 46, ,51 48, 32 51,74 51, ,98 54, ,6 56, ,21 57, ,45 6, ,6 62, ,68 64, ,91 67, ,15 7,64 17

19 L OPEN-END (SPIRAL CUT) BELT CHARACTERISTICS STANDARD WIDTHS (inch) STANDARD WIDTHS (mm) 12,7 19,5 25,4 Weight (gr/m) Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: -,8/+,4 mm Standard thickness tolerance: ±,25 mm Standard length tolerance: ±,8 mm/m Standard roll length: 45-7/+5 m W 3,8 1,9 9,525 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (inch) Breaking Strength (N) BELT ELONGATION Load (N) ,1,,5 1, 1,5 2, 2,5 3, 3,5 Elongation (%) L 1 L 75 L 5 18

20 L OPEN-END (SPIRAL CUT) TOOTH RESISTANCE (N/cm) L RPM (1/min) RPM (1/min) (N/cm) FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 1 31,27 3, ,38 35, ,45 41, ,48 44, ,51 47, ,54 5, ,57 53, ,61 56,85 2 6,64 59, ,67 62, ,7 65, ,73 68, ,77 72, ,8 75, ,83 78, ,86 81, ,89 84, ,93 87,17 3 9,96 9, ,2 96, ,8 12, ,15 18, ,28 12, ,4 132, ,53 144,76 19

21 H OPEN-END (STRAIGHT CUT) BELT CHARACTERISTICS STANDARD WIDTHS (inch) STANDARD WIDTHS (mm) 12,7 19,5 25,4 38,1 5,8 76,2 Weight (gr/m) Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,8 mm Standard thickness tolerance: ±,6 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m W 4,4 2,29 12,7 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (inch) Breaking Strength (N) BELT ELONGATION Load (N) H 3 H 2 H 15 H 1 H 75 H ,,5 1, 1,5 2, 2,5 3, 3,5 3,8 4, 4,5 Elongation (%) 2

22 H OPEN-END (STRAIGHT CUT) TOOTH RESISTANCE (N/cm) H RPM (1/min) RPM (1/min) (N/cm) FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 14 56,6 55, ,64 59, ,68 63, ,72 67, ,77 71, ,81 75,44 2 8,85 79, ,89 83, ,94 87, ,98 91, ,2 95, ,6 99, ,11 13, ,15 17, ,19 111, ,23 115, ,28 119, ,36 127, ,4 132, ,45 136, ,49 14, ,53 144, ,62 152, ,7 16, ,87 176, ,4 192, ,21 28, ,55 241,18 21

23 RPP3 OPEN-END (SPIRAL CUT) BELT CHARACTERISTICS STANDARD WIDTHS (mm) Weight (gr/m) Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,4 mm Standard thickness tolerance: ±,25 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m W 2,4 1,15 3 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (mm) Breaking Strength (N) BELT ELONGATION Load (N) RPP3M15 RPP3M12 RPP3M9 5 3,,,5 1, 1,5 2, 2,5 3, 3,5 Elongation (%) 22

24 RPP3 OPEN-END (SPIRAL CUT) TOOTH RESISTANCE (N/cm) RPP3 FLEXION RESISTANCE RPM (1/min) RPM (1/min) (N/cm) Meshing Check is very suggested because of the belt s elasticity. To safeguard the correct meshing it might be possible that Meshing Check leads to a wider belt. z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 1 9,55 8, ,46 1, ,37 12, ,28 14, ,19 16, ,1 18, ,5 19, ,1 2, ,92 22, ,83 24, ,74 25, ,65 27, ,56 29, ,38 33, ,2 37, ,2 41, ,84 45,7 6 57,3 56, ,75 67,99 23

25 RPP5 OPEN-END (STRAIGHT CUT) BELT CHARACTERISTICS STANDARD WIDTHS (mm) Weight (gr/m) Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,5 mm Standard thickness tolerance: ±,25 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m W 3,8 2 5 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (mm) Breaking Strength (N) BELT ELONGATION Load (N) RPP5M3 RPP5M25 RPP5M2 RPP5M15 RPP5M12 RPP5M , 3,7,,5 1, 1,5 2, 2,5 3, 3,5 4, Elongation (%) 24

26 RPP5 OPEN-END (STRAIGHT CUT) TOOTH RESISTANCE (N/cm) RPP FLEXION RESISTANCE RPM (1/min) RPM (1/min) (N/cm) Meshing Check is very suggested because of the belt s elasticity. To safeguard the correct meshing it might be possible that Meshing Check leads to a wider belt. z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 12 19,1 17, ,28 21, ,87 22, ,46 24, ,65 27,5 2 31,83 3, ,42 32, ,1 33, ,2 37, ,38 4, ,56 43, ,75 46,6 32 5,93 49, ,3 56, ,66 62, ,3 68, ,39 75, ,49 94, ,59 113,45 25

27 RPP8 OPEN-END (STRAIGHT CUT) BELT CHARACTERISTICS STANDARD WIDTHS (mm) Weight (gr/m) Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,5 mm Standard thickness tolerance: ±,4 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m W 5,4 3,2 8 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (mm) Breaking Strength (N) BELT ELONGATION Load (N) ,,5 1, 1,5 2, 2,5 3,1 3, 3,5 42 3,8 4, Elongation (%) RPP8M85 RPP8M5 RPP8M3 RPP8M25 RPP8M2 RPP8M15 RPP8M1 26

28 RPP8 OPEN-END (STRAIGHT CUT) TOOTH RESISTANCE (N/cm) RPM (1/min) RPP8 RPM (1/min) (N/cm) Meshing Check is very suggested because of the belt s elasticity. To safeguard the correct meshing it might be possible that Meshing Check leads to a wider belt. FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 22 56,2 54, ,12 59, ,21 64, ,3 69, ,39 75, ,49 8, ,58 85, ,67 9, ,77 95, ,86 1, ,5 11, ,23 12, ,51 136, ,97 161, ,35 181, ,72 22, ,18 227, ,2 283, ,69 365, ,81 426, ,92 487,55 27

29 SILVER5 OPEN-END (SPIRAL CUT) BELT CHARACTERISTICS STANDARD WIDTHS (mm) Weight (gr/m) Standard compound: Chloroprene 9 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,5 mm Standard thickness tolerance: ±,25 mm Standard length tolerance: ±,8 mm/m Standard roll length: 6 m ± 5 m W 3,8 2 5 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (mm) Breaking Strength (N) BELT ELONGATION SILVER5M25 SILVER5M15 8 Load (N) ,5 3,4,,5 1, 1,5 2, 2,5 3, 3,5 4, Elongation (%) 28

30 SILVER5 OPEN-END (SPIRAL CUT) TOOTH RESISTANCE (N/cm) RPM (1/min) SILVER5 RPM (1/min) (N/cm) Meshing Check is very suggested because of the belt s elasticity. To safeguard the correct meshing it might be possible that Meshing Check leads to a wider belt. FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 12 19,1 17, ,28 21, ,87 22, ,46 24, ,65 27,5 2 31,83 3, ,42 32, ,1 33, ,2 37, ,38 4, ,56 43, ,75 46,6 32 5,93 49, ,3 56, ,66 62, ,3 68, ,39 75, ,49 94, ,59 113,45 29

31 SILVER8 OPEN-END (SPIRAL CUT) BELT CHARACTERISTICS STANDARD WIDTHS (mm) Weight (gr/m) Standard compound: Chloroprene 9 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,5 mm Standard thickness tolerance: ±,4 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m Antistatic in standard version (according BS 25) W 5,4 3,2 8 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (mm) Breaking Strength (N) BELT ELONGATION SILVER8M25 SILVER8M2 SILVER8M15 SILVER8M1 Load (N) ,1 3,5,,5 1, 1,5 2, 2,5 3, 3,5 4, Elongation (%) 3

32 SILVER8 OPEN-END (SPIRAL CUT) TOOTH RESISTANCE (N/cm) RPM (1/min) SILVER8 RPM (1/min) (N/cm) Meshing Check is very suggested because of the belt s elasticity. To safeguard the correct meshing it might be possible that Meshing Check leads to a wider belt. FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 22 56,2 54, ,12 59, ,21 64, ,3 69, ,39 75, ,49 8, ,58 85, ,67 9, ,77 95, ,86 1, ,5 11, ,23 12, ,51 136, ,97 161, ,35 181, ,72 22, ,18 227, ,21 283, ,69 365, ,81 426, ,92 487,55 31

33 STD8 OPEN-END (SPIRAL CUT) BELT CHARACTERISTICS STANDARD WIDTHS (mm) Weight (gr/m) Standard compound: Chloroprene 74 ± 4 ShA Standard tooth cover: nylon fabric Standard cord: glass Standard width tolerance: ±,5 mm Standard thickness tolerance: ±,4 mm Standard length tolerance: ±,8 mm/m Standard roll length: 5 ± 5 m W 5,4 3,5 8 TRACTION RESISTANCE AND ELONGATION DATA CALCULATION PARAMETERS Belt Width (mm) Breaking Strength (N) BELT ELONGATION Load (N) ,1 3,5,,5 1, 1,5 2, 2,5 3, 3,5 4, STD8M25 STD8M2 STD8M15 STD8M12 STD8M1 Elongation (%) 32

34 STD8 OPEN-END (SPIRAL CUT) TOOTH RESISTANCE (N/cm) RPM (1/min) STD8 RPM (1/min) (N/cm) Meshing Check is very suggested because of the belt s elasticity. To safeguard the correct meshing it might be possible that Meshing Check leads to a wider belt. FLEXION RESISTANCE z min z min Idler min dia (mm) Glass cords PULLEYS (for more details please see our pulleys catalogue) B L Dm 22 56,2 54, ,12 59, ,21 64, ,3 69,9 3 76,39 74, ,49 8, ,58 85, ,67 9, ,77 95, ,86 1, ,5 11, ,23 12, ,6 141, ,97 16, ,35 181, ,72 22, ,18 227, ,21 283, ,69 365, ,81 426, ,92 487,52 33

35 SPECIAL EXECUTION FEASIBILITY Megadyne can make special execution on customer s request to improve belt properties and to better suit to special applications. SUPER On customer s request and with minimum quantity we can produce the belt with a double nylon fabric on surface to improve torque carrying capacity. The advantages are the following: Exceptional resistance to abrasion Low coefficient of friction Increased drive efficiency Increased belt and pulley life From the table on this book, performances increase 1% by. SPECIAL CONSTRUCTIONS On customer s request and with minimum quantity we can produce GOLD5, GOLD8 and PLATINUM8 in open end version up to a width of 25 mm. ANTISTATIC On customer s request and with minimum quantity we can produce L, H, RPP5 and RPP8 belts in antistatic version (according to BS 25). With minimum quantity Megadyne can also produce super-conductive belts overcoming BS 25 parameters. HIGH TEMPERATURE On customer s request and with minimum quantity we can produce RPP8, STD8 and H belts suitable for temperatures up to 13 C. SPECIAL BRANDING On customer s request and with minimum quantity we can customize the belt s branding. SPECIAL PACKAGING On customer s request and with minimum quantity we can package the belts following some special indications. SPECIAL WIDHT On customer s request and with minimum quantity belts in special widths can be manufactured. For more information please check with our Application partment. LOW NOISE On customer s request and with minimum quantity we can produce soft compound belts (6 ± 3 ShA) to reduce noise problems. In this case the belt s performances will decrease by a 1% than a standard one. 34

36 FIXING PLATES The fixing plates are used to fix the tail of the open belts. On the customer s request, the plates can be delivered with or without fixing holes. As the belt can t be stretched with the fixing plates we suggest to use other tension system. The plates are delivered in aluminium alloy. The Megadyne Technical Staff is ready to study special or particular applications. A A 7P B 7P B d P d P F F C F F C S S 5P P+B XL L H HTD RPP Order code example: AT1 pitch clamping plate for 25 mm width belt. 5P P+B Aluminium Clamping plates for imperial pitch belts Belt width (inches) Pitch F d B A S C XL 6 5,5 3,5 42,5 8 25,5 28,5 32 L , ,5 H , , Aluminium Clamping plates for HTD pitch belts Belt width (mm) Pitch F d B A S C 5M 6 5,5 3,25 41, M Available in customized length 35

37 USEFUL FORMULAS AND CONVERSION TABLE SPEED V: peripheral speed (m/s) n 1 : rotation speed (RPM) d 1 : pulley diameter (mm) V= d 1 n n 1 = V 191 d 1 d 1 = V 191 n 1 FORCES AND TORQUE F u : peripheral force (N) M t : drive torque (Nm) P: power (kw) n 1 : rotation speed (RPM) d 1 : pulley diameter (mm) V: peripheral speed (m/s) F u = 19,1 16 P d 1 n 1 M t = P 955 M n t = F u d F u = 2 M d 1 F u = P 13 d 1 M t = P d 1 2 V SPEED P: power (kw) F u : peripheral force (N) M t : drive torque (Nm) n 1 : rotation speed (RPM) d 1 : pulley diameter (mm) P= F u d 1 n 1 P= M t n 1 19, P= F u V 1 To convert from To Multiply by CV HP, CV kcal/h 63,24151 CV W 735,4988 CV kw, CV kgf m/s 75 CV lbf ft/s 542,476 HP CV 1,1387 HP kcal/h 641,1865 HP W 745,6999 HP kw, HP kgf m/s 76,422 HP lbf ft/s 55 in m,254 in cm 2,54 in mm 25,4 in ft,83 in 2 m 2,64516 in 2 cm 2 6,4516 in 2 mm 2 645,16 in 2 ft 2, in 3 m 3 1, in 3 cm 3 16,3876 in 3 mm ,6 in 3 ft 3,57874 To convert from To Multiply by J CV h 3, J HP h 3, J kwh 2, kg lb 2,24623 kgf N 9,8665 kgf lbf 2,24623 kgf m/s CV, kgf m/s W 9,8665 kgf m/s kw,98665 kw CV 1, kw kcal/h 859,8452 kw W 1 kw kgf m/s 11,9716 kw lbf ft/s 737,5621 lb kg, lbf kgf, lb N 4, N kgf, N lbf, W CV, W HP, W kcal/h, W kw,1 W kgf m/s, W lbf ft/s,

38 The data and information contained in the present catalogue are up-to-dated to the date of the catalogue's printing. Megadyne Spa reserves the right to modify the specifications, performances and other information relating to the belts described in the present catalogue, at any time at its own discretion, without any prior notice. For updating refer to our web site Technical specifications, performances and other information provided in the present catalogue are indicative and do not bound Megadyne unless such specifications, performances or other information are expressly agreed in the agreement with the customer. We also recommend to read carefully the following documents in our web site - Megadyne General Conditions of Sale (comprising the warranty) - Theoretical Belt Life - Drive Components: Storage, Installation, Maintenance and Troubleshooting Handbook - Belts standard use condition and temperature. Copyright Notice: Megadyne Spa copyright. All rights reserved. Megadyne is and shall remain the owner of all rights on drawings, technical specifications and any other information contained in the present catalogue or otherwise communicated by Megadyne Spa to the customer. The customer shall not disclose such information to third parties or use such information for purposes different from the definition of the order to Megadyne Spa, unless upon prior written authorization of Megadyne. ISO 91:28 - ISO 141:24 MEGADYNE RUBBER S.A.