Share article:

Correct selection of gearbox synchronous belts

ConstructionMaterialsTransmission

A precisely designed synchronous belt drive is key to efficient and durable power transmission in industrial applications. However, what is important when choosing the right belt? From calculating the rated power to determining the optimum belt width to verifying the center distance between shafts, each step affects the performance and service life of the drive system. Excessive tension can overload components; insufficient tension can cause slippage or tooth failure. That’s why the right belt tension is critical for reliable operation. In this blog post, you’ll learn how to determine the ideal belt configuration step-by-step, which calculation formulas are available to assist you, and what to look for during adjustment and maintenance.

How to Select Gearbox Synchronous Belts

An efficient synchronous belt drive requires precise sizing to ensure optimal power transmission, long service life, and minimal maintenance. In this blog post, we’ll show you step-by-step how to select the right belt based on proven calculation formulas and manufacturer’s specifications, determine the optimal width, and adjust tension correctly to avoid typical malfunctions and maximize the performance of your drive system.

Step 1: Define conditions Step 2: Design power calc. By chosen series Step 3: Preselect the Belt type from Selection table Step 4: Calc. - tooth count for Large and small pulleys, Belt length and Center distance Step 5: Find min. belt width Step 6: Check if setting range of Center distance is kept Holds

Step 1: Determining the framework conditions

Before selecting a synchronous belt solution, the basic technical requirements must be clearly defined. The sizing of the drive system depends significantly on the force to be transferred, the operating conditions and the service life requirements. Precise specification of these parameters ensures optimal performance, minimal maintenance costs and long belt service life.

The required framework conditions include:

  1. Machine and drive type
    1. What type of machine is it? e.g. conveyor, mixer, etc.
  2. Power transmission of the drive side
    1. What is the rated output supplied by the motor?
    2. How many revolutions are provided by the drive on the drive pulley?
    3. What transfer force Pt is applied to the drive pulley?
    4. Are there any load variations on the input or output side?
  3. Operating time per day
    1. Continuous or intermittent operation?
    2. Are start-stop operations frequently performed?
  4. Speeds and gear ratio
    1. What is the maximum speed reached by the small pulley?
    2. What rotation ratio/gear ratio is needed?
    3. What is the actual number of teeth for the large and small pulleys?
    4. What is the minimum number of teeth on the small pulleys?
    5. Is the output turning faster than the drive?
  5. Shaft center distance
    1. Is there a diameter limit for the pulleys?
    2. Is there a minimum diameter?
    3. What is the shaft spacing?
    4. Are there any interfering attachments?
  6. Other operating conditions
    1. Temperature, dust
    2. Moisture, chemicals, etc.

In many cases, an estimate of the expected belt type is already made when determining the framework conditions. This is usually done by preselecting using the selection guide tables (see step 3). By simply reading these overviews, the belt series can already be narrowed down based on the expected speed of the small pulley and the estimated rated output. With the synchronous belt series selected in this way, the calculation can then be carried out specifically to check the sizing and selection.

Step 2: Calculating the rated power

The rated power of a synchronous belt describes the actual power that the belt must reliably transmit under real-world operating conditions. It takes into account not only the power (Pt) transmitted to the synchronous belt provided in the form of transmission torque (tq) by the motor-driven synchronous pulley. It also takes into account - in the form of an overload factor (Ks)- additional influencing factors such as load fluctuations, operating time and other influencing variables. By contrast, the rated output of the drive only indicates the steady-state power it can deliver under ideal standard conditions. However, this rated output does not take into account external influences such as load variations or operating voltages in the belt drive.

MISUMI offers a wide range of high-quality synchronous belts that are optimized for a wide range of industrial applications. This ranges from synchronous belts for precise drive systems to models for high-performance applications with high loads and speeds. Correct calculation of the rated power is critical to selecting the right belt. The following first explains the calculation of the rated power in general and then goes into more detail using various categories.

Note for the following calculations of the rated power that the calculations apply only to the designated MISUMI synchronous belts and are not necessarily transferable.

General formula

The rated power Pd is calculated by multiplying the transmitted power Pt with an overload factor Ks:

P_{d} = P_{t} \times K_{s}

P d: Rated Power
Pt: Transmission power in kW
Ks: Overload factor

Transmission power

The transmission power Pt can be calculated using a range of variables.

Torque and speed:

P_{t} =t_{q} \times \frac {n}{9550}

 

Pt: Transmission power (kW)
tq: Transmission torque (Nm)
n: Speed (min-1)

9550: Conversion factor for converting torque and speed to kW

with belt speed and tractive force

P_{t} = T_{e} \times \frac {v}{1000}

 

Te: Effective stress(N)
Pt: Transmission power (kW)
v: Motion speed (m/s)

1000: Converting Watts to Kilowatts

T_{e} = m \times \alpha


m: Mass (g)
α: acceleration (m/s²)

Overload factor

While the basic formula for the rated power always remains the same, the individual correction factors are adjusted depending on the application. The specific values for these factors depend on the operating conditions as well as the design of the drive system. They are provided in the technical documentation and tables of the belt manufacturers. They contain detailed information related to the use case, operating time and design features. If one of the factors specified in the formula is not required for the respective series, the respective factor is set to zero in the calculation.

The overload factor Ks takes into account additional loads caused by dynamic load changes, different rotation ratios and the use of tension pulleys. Depending on the belt series, the overload factor Ks consists of up to 5 correction factors:

K_s = K_o + K_r + K_h + K_i + K_m

Ko: Overload Correction Factor
Kr: Rotation Ratio Correction Factor
  • Number of teeth (large pulley to small pulley)
Ki: Tension pulley Correction Factor
Kh: Operating Time Correction Factor
Km: Engagement Correction Factor

Determining the load correction factor Ko

The necessary tables can be found here:

Determining the load correction factor Kr

The necessary tables can be found here:

Determining the tension pulley correction factor Ki

The necessary tables can be found here:

Determining the start/stop correction factor Km

The necessary tables can be found here:

Step 3: Preliminary selection of belt type

The belt guide is provisionally selected using guide tables.

These tables provided by manufacturers include key parameters, such as the rated output, i.e., the maximum transferable power of the belt under standard conditions (in kW). They also consider the pulley speed, which indicates the rotational speed of the driven pulley (in rpm), or the drive pulley speed, which describes the speed of the driving pulley (in rpm).

Selection Tables

Selection guide table 5 (Series UP_M) 100 0.001 0.01 0.1 1 10 100 1000 10000 Lower speed Pulleys (1/min) 1000 10000 UP8M UP5M Rated power (kW) Selection guide table (Series 2GT·3GT) Selection guide table (Series EV5GT·EV8YU) 10,000 1,000 100 10 0.1 0.01 1 1 0 100 Type 2GT Type 3GT Lower speed Pulleys (1/min) Rated power (kW ) 10,000 14,000 1,000 100 10 1 0.1 100 10 1,000 EV5GT EV8YU Rated power (kW ) Lower speed Pulleys (1/min) Temporary selection of belt type from the Selection guide table Selection guide table 1 (MXL,XL,L,H,T5,T10) 50,000 40,000 30,000 20,000 10,000 5,000 3,450 2,500 1,750 1,500 1,100 870 690 515 500 400 300 200 100 0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 2 3 5 1 0 2 0 30 5 0 10 0 20 0 300 MXL XL ∙ T5 L ∙ T10 H Lower speed Pulleys (1/min) Selection guide table 2 (Series S_M) Selection guide table 3 (Series P_M) 14000 0 0 0 3 0 0 0 4 0 0 0 5 0 0 0 7 0 0 0 0 1 P2M060 P2M100 P2M040 P3M150 P5M150 P5M200 P5M250 P8M150 P8M200 P8M250 P8M400 P8M600 P5M100 P3M100 P3M060 2000 70 10W 20 30 40 50 70W 0.1kW 0.2 0.3 0.4 0.5 0.7 1 2 3 4 5 10 20 30 40 50 70 100 200 300kW 7 10W 20 30 40 50 70W 0.2 0.3 0.4 0.5 0.7 3 5 7 10 20 30 40 50 70 100 200kW 4 1 2 0.1kW 7W 10 20 30 40 70W 0.1kW 0.2 0.3 0.4 0.5 0.7 2 3 4 5 7 10 20 30 40 50 70 100kW 1 50 10 0 20 0 30 0 40 0 50 0 70 0 1000 Teeth count small timing pulley 20 teeth 30 teeth 40 teeth Usable teeth count 20.30.40 Zähne 30.40 Zähne Pitch (mm) Belt width (mm) Design Power kW (W) Pulley speed (rpm) (1/min) Selection guide table 4 (MTS8M) Rated power (kW) 10000 1000 100 10 100 1000 10 1 0.1 0.01 S2M S2M S3M S3M S5M S5M S8M S8M S14M S14M Small pulley speed (rpm) 0.1 1 10 100 10000 1000 100 10 MTS8M Small pulley speed (rpm) Nennleistung (kW ) Rated power (kW)

The article on selection of V-belts and V-belt pulleys shows parallels when designing belt drives with different belt types and provides comparisons.

Step 4: Calculating the number of teeth, belt length and center distance between shafts

Calculating the number of teeth, belt length and center distance between shafts is another important step for proper sizing of a synchronous belt drive. The following article will give you practical tips on the interaction of timing belts, pulleys and tension rollers, which makes optimal selection and adjustment much easier.

Selecting the minimum number of teeth for large and small pulleys

The gear ratio for synchronous belt drives describes the ratio between the speed of the drive shaft and the speed of the output shaft. It is determined by the sizes of the pulleys used, e.g. their number of teeth. Since synchronous belts have a fixed tooth pitch, the number of teeth must be selected to give a practical and accurate gear ratio.

Calculating the Gear Ratio

i = \frac {1}{x} = \frac{Tc_{g}}{Tc_{s}}
Tc_{g} = Tc_{s} \times x

 

 

i: Speed / gear ratio
Tcg: Number of teeth (large pulley)
Tcs: Number of teeth (small pulley)

Table 4 - Minimum number of teeth
Speed small
pulleys (1/min)		 Belt type, minimum number of teeth
MXL XL     L H S2M S3M S5M S8M S14M P2M P3M P5M P8M UP5M UP8M MTS8M T5 T10 2GT 3GT EV5GT EV8YU
900 or less 12 11     14 16 16 16 16 24 -- 14 14 18 22 18 22 24 12 16 12 14 18 26
Over 900, 1200 or less 15 11     14 18 16 16 20 25 40 14 14 20 24 20 24 24 14 18 14 14 20 28
Over 1200, 1800 or less 15 12     16 20 18 18 24 28 48 14 14 24 26 24 26 26 16 20 16 16 24 32
Over 1800, 3600 or less 16 16     19 24 20 20 24 30 -- 16 18 28 28 28 28 28 18 22 20 20 28 36
Over 3600, 4800 or less -- 16     20 24 20 20 24 32 -- 18 20 30 30 30 28 28 18 22 20 20 30 --
Over 4800, 10000 or less -- -- -- -- -- -- 20 20 26 -- -- 20 28 40 -- 40 -- -- -- -- -- -- -- --

Calculating the Approximate Belt Circumference

Calculating the approximate belt circumference L’p allows for an initial estimate of the required length of the synchronous belt. This takes into account the preliminary shaft spacing and outer diameters of the large and small synchronous pulleys.

The approximate belt circumference L’p is compared to the standard lengths of the available synchronous belts and the closest available belt circumference Lp is selected. Since the actual belt circumference Lp chosen often differs slightly from the approximate circumference, the exact shaft spacing C must be recalculated for that belt circumference.

L'_p=2C + \frac{\pi\times(D_1+D_2)}{2}+\frac{(D_1+D_2)^2}{4C}

L'p = approximate belt circumference
C = shaft spacing
D'1 = effective diameter - large pulley
D'2 = effective diameter - small pulley

Diameter (D) and pitch diameter (D') of a pulley
Diameter (D) and pitch diameter (D') of a pulley

The effective diameter D' is greater than the outer diameter of the pulley and depends on the selected tooth profile and number of teeth. Refer to the product data provided by the manufacturer for appropriate values.

Calculating the Required Shaft Spacing

Due to their tooth profile, synchronous belts cannot be shortened at arbitrary points. The belt length must therefore always be calculated by rounding up to integer numbers (teeth).

This results in a calculated deviation of the technically feasible shaft spacing from the originally intended shaft spacing. This deviation must be corrected either by an adjustable shaft spacing or an additional clamping element.

C = \frac{b +\sqrt{b^{2} - 8 (D'_{1} - D'_{2})^{2}}}{8}
b=2L_{p} − \pi (D'_{1}+D'_{2})

C = shaft spacing
b = Auxiliary value for calculation
D'1= effective diameter (large pulley in mm)
D'2= effective diameter (small pulley in mm)
L p = belt circumference

Step 5: Determining the belt width

Belt width significantly affects the performance and service life of a synchronous belt drive. Correct sizing ensures that the transmitted power is optimally distributed, unnecessary loads are avoided, and the belt is reliable.

The belt width must be selected so that the belt can reliably transmit the required power without excessive wear or overload. Depending on the size of the pulleys, a different number of teeth are engaged. The fewer teeth are engaged, the less force can be transferred from the synchronous belt without overload. The number of teeth in engagement is taken into account in the calculation of the required belt width by the correction factor Km.

The required belt width can be calculated by the following formula:

B_{w} = \frac{P_{d}}{P_{s} \times K_{m}} \times W_{p}

B w’ = approximate belt width (mm)
Pd= rated power
P s= reference transmission capacity
K m= engagement correction coefficient
W p= reference belt width (mm)

Belt type Reference belt width Wp MXL 6.4 XL / L / H 25.4 S2M 4 S3M 6 S5M 10 S8M / MTS8M 60 S14M 120 P2M 4 P3M 6 P5M 10 P8M 15 T5 / T10 10 Table: Reference belt width Wp

The number of teeth in engagement Z m has a direct effect on the engagement correction coefficient K m, which in turn influences the required belt width B’w.

Zähnezahl im Eingriff (Zm) Km *Km mehr als 6 1.0 1.0 5 0.8 0.7 4 0.6 0.5 3 0.4 - 2 0.2 - Tabelle: Eingriff Korrekturkoeffizient Km
Z_{m} = \frac{Z_{d} \times \theta}{360°}
\theta = 180° - \frac{57.3 (D_{1} - D_{2})}{C}

Z m= number of teeth in engagement
Zd= number of teeth of small pulleys
θ = contact angle (°)
C = shaft spacing
D1= outer diameter (large pulleys in mm)
D2= outer diameter (small pulley in mm)

Checking the rated power

In a further step, it must be checked whether the rated power Pd satisfies the following formula:

P_{d} < P_{s} \times K_{m} \times K_{b}\times K_{L}

Pd= rated power
Ps= reference transmission power
Km= engagement correction coefficient
KL= length correction coefficient

If the calculated rated power Pd is less than the product of the other factors, then the selected belt width is sufficient. If the determined power is equal to or greater than the product of the other factors, the current belt width is not sufficient to reliably transmit the required power. In such a case, the belt width must be one size larger and the test must be repeated. This process may need to be repeated until the appropriate width is found.

An overview of the width correction coefficients (Kb) and length correction coefficients (KL) for each series can be found here in the MISUMI web index.

Step 6: Checking the adjustment range of the shaft spacing

After the belt width has been determined, it must be checked whether the adjustment range of the shaft spacing meets the requirements. The adjustment range of the shaft spacing indicates the range within which the center distance between the input and output shafts can be variably adjusted. This check ensures that the belt can be properly tensioned, thus reducing wear and ensuring long drive service life.

Example illustration - adjustment ranges for shaft center distance
Example illustration - adjustment ranges for shaft center distance

 

Ci: Minimum adjustment range, inner
Cs: Minimum adjustment range, outer
C: Shaft spacing

MISUMI Web Index - Minimum Adjustment Range Tables by Type and Belt Length

If the calculated shaft spacing is within the acceptable range, the design is correct. If not, an adjustment must be made by changing the individual parameters.

Precautions when using synchronous belts

Proper belt tension is critical to the service life and function of a synchronous belt. Excessive or insufficient tension can cause serious problems that affect the efficiency and durability of the drive system. If the belt is over-tensioned, the bearings, shafts and pulleys may be subjected to excessive tractive force. If the belt is not tight enough, the belt may jump out of the pulley groove due to sudden torque or shock loads.

To ensure optimal belt tension, the correct sagging load must be applied.

Example illustration - adjusting optimal synchronous belt tension
Example illustration - adjusting optimal synchronous belt tension
T_{d} = \frac{T_{i} + \frac{t \times Y}{L_{p}}}{16}

Td = Load N required for sagging d at center of span length t
Ti = preload
Lp = belt length (mm)
Y = correction coefficient
C = shaft spacing (mm)
δ = deflection: δ=0.016t
t = span length (mm)

t = \sqrt{C^{2} - \frac{(D_{p - d_{p}})^{2}}{4}}

dp = diameter of the pitch circle of the small tension pulley (mm)
Dp = diameter of the pitch circle of the large tension pulley (mm)

Table 1a - Ko for MXL, XL, L, H, S_M, MTS_M and T series

Table 1a

Max. power = Base power All Periodic 3 to 5 h/day Regular 8 to 12 h/day Continuous 8 to 12 h/day Periodic 3 to 5 h/day Regular 8 to 12 h/day Continuous 8 to 12 h/day A1 1,0 1,2 1,4 1,2 1,4 1,6 A2 1,2 1,4 1,6 1,4 1,6 1,8 A3 1,3 1,5 1,7 1,5 1,7 1,9 A4 1,4 1,6 1,8 1,6 1,8 2,0 A5 1,5 1,7 1,9 1,7 1,9 2,1 A6 1,6 1,8 2,0 1,8 2,0 2,2 A7 1,7 1,9 2,1 1,9 2,1 2,3 A1 A2 A3 A4 A5 A6 A7 Note: Mixers (cement and viscous media), belt conveyors (ore, coal and sand), grinding machine, molding machine, drilling machine, Milling machine, compressor (centrifugal), vibrator, textile machine (warp sizing and winding machine), rotary compressor, Compressor (reciprocating) Conveyors (apron, pan, bucket and cup), suction parts, fans, blowers (centrifugal, suction and discharge), Generators, exciter, hoist, elevator, rubber plant (satinizing, calender and extruder), textile machine (Loom, fine spinning, twisting and weft winding machine) Centrifugal separator, conveyors (belt conveyor and screw conveyor), hammer forge, paper machine (pulp machine) ∙ This table lists examples of belt-driven machines. For other belt-driven machines, a Load correction factor should be set from this table. ∙ If over 100 starts/stops per day or rapid acceleration/braking are required, multiply the above values by 1,3. (MTS_M only) Table 1a- Load correction factor (Ko) for MXL, XL, L, H, S_M, MTS_M and T series 1,0 Motor type (except synchronous or linear drives) Occurs 1 to 2 x daily peak Group of Machine Max. power ≤ 300% of base power Max. power > 300% of base power AC motor (standard motor, Synchro motor), DC motor (shunt), Motor with 2+ cylinders Special motor (high torque), Single-cylinder motor, DC motor (series), Use with countershaft or clutch Duty time Duty time Machine group assignment: Plant instruments, projector, measuring instrument, medical device Cleaner, sewing machine, office equipment, wood lathe, band saw Belt conveyor for light loads, packer, classifier Liquid mixer, drilling machine, lathe, screw machine, circular saw, planer, washing machine Paper machine (except pulp machine), printing machine

Table 1b - Ko for P_M and UP_M series

Table 1b

I II III Peak power Up to 200% Over base power Peak power 200 to 300% Over base power Peak power Over 300% Over base power A1 1,0 1,2 1,4 A2 1,3 1,5 1,7 A3 1,6 1,8 2,0 A4 1,8 2 2,2 A5 2 2,2 2,5 − − All types 2-pole 100kW or more 90W to 3.7kW 2.2kW or less 4-pole 55kW or more 45kW or less − 6-pole 37kW or more 30kW or less − 8-pole 15kW or more 11kW or less − 4-pole − 15kW or less 11kW or less 6-pole − 11kW or less 7.5kW or less 8-pole − 5.5kW or less 3.7kW or less − Medium torque High torque Shunt Compound Series 8+ cylinders 7 to 5 cyl. 4 to 2 cyl. − − All types A1 A2 A3 A4 A5 Note: Motor type Very smooth drive Smooth drive Drive with mod. shock Drive with high shock Group of Machine Motor type AC motor Drive with heavy shock Hydraulic mot. DC motor Combustion engine Synchro motor Wound rotor Cage- induction 1-phase Table 1b - Load correction factor (Ko) for P_M and UP_M Machine group assignment: Meter, camera, radar, medical devices, projector, etc. Belt conveyors (light duty), chain conveyors (light duty), drill press, lathe, printing press, cutter, Paper folder, lathe, band or circular saw, planer, etc. Belt conveyors (ore, coal, sand), boring mill, grinder or miller, molder, metal saw, winch hoist, dryer, Excavator, mixer, powder granulator, pump (centrifugal, gear and rotary), agitator, mixer (viscous media), Centrifugal blower, general rubber machine, generator, classifier (electric), etc. Conveyors (apron, bucket, chain, screw), hoist, cutting press, shaker Pulp machine, loom, spinning frame, twister, mixer, centrifugal separator, blower (axial flow, Mining and roots), construction gear, hammer forge, roller table, etc. Crank press, pump (piston), compressor (piston), construction, mining equipment incl. crushers (ball, rod, gravel), Rubber mixer, etc. ∙ For forward/reverse drives, high torque or extreme shock loads, a Service factor of 2.5 or more may be used.

Table 1c - Ko for 2GT and 3GT series

Table 1c

I II III Peak power Up to 150% Above base power Peak power 150 to 200% Above base power Peak power Over 200% Above base power 1-phase – – All types 2-phase – – All types 4-phase – 37kW or more 30kW or less 6-phase 8-phase – – All types 4-phase – – 15kW or less 6-phase – – 11kW or less 8-phase – – 5.5kW or less – Type Standard torque Type High torque Shunt Wound fld Series – – All types Office devices – 1.2 1.4 – 1.4 1.6 1 1.2 1.4 Finance Devices 1.3 1.4 1.5 1.2 1.4 1.6 1.4 1.6 1.8 1.5 1.7 1.9 1 1.2 1.4 1.2 1.4 1.6 1.3 1.5 1.7 1.2 1.4 1.6 Printing 1.2 1.4 1.6 Textile m/c 1.3 1.5 1.7 – 1.2 1.4 – 1.6 1.8 1.1 1.3 1.5 1.2 1.4 1.6 1.4 1.6 1.8 1.4 1.6 1.8 Note 1: Note 2: Group Of Machine Motor type AC Motor Home appliances Motor type Squirrel- Cage type Wound-field Type Sync motor DC motor Hydraulic motor Printer · Fax · Copier Juicer Vacuum Food, Medical, Medical Equipment Change machine · Ticket machine Ticket gates · ATM Baking unit Mixer · Pelletizer Centrifuge Medical devices · Gauges Machine Tools Drill press · Lathe Mill Wood lathe Printer · Bookbinder Cutter Saw Conveyor, Packer Textile · Knitter Saw - Home use Saw - Industrial use Conveyor - Light duty Packer Film, Wire draw- Machine Load correction factor (Ko) Start/stop frequency If max torque occurs at each system start or stop, select the proper Load correction factor (Ko) from table "Load correction factor (Ko) Start/stop frequency"! Calender · Extruder Wire drawing line Table 1c - Application coefficient (Ko) for 2GT and 3GT series ∙ For spindle motor uses Use Ko=2.2 for rated torque and base speed design. ∙ For servo motor uses Use Ko=2.5 for rated torque design and Ko=0.5 for peak torque. Fewer than 100 starts/stops per day 100+ starts/stops, but under 1,000/day Over 1,000 starts/stops per day 1.5 2.0 2.5

Table 1d - Ko for EV5GT and EV8GT series

Table 1d

Peak power Up to 200% Over Base power Peak power 201~299% Over Base power Peak power Over 200% Over Base power Robot Scara type 2.0 2.0 1.6 1.7 1.8 Molding machine Mold clamp, Ball screw drive 1.8 1.8 1.3 1.4 1.5 Machine tools Lathe · Drill press 1.6 1.3 1.2 1.3 1.4 Machine tools Mill 1.7 1.3 1.2 1.3 1.4 1.8 1.8 1.4 1.5 1.6 1.5 1.5 1.1 0.1 0.2 1.6 1.5 1.1 0.1 0.2 Agitator · Mixer Liquids 1.6 1.6 1.2 1.3 1.4 Viscous media 1.7 1.7 1.3 1.4 1.5 1.8 1.8 1.4 1.5 1.6 1.9 1.9 1.5 1.6 1.7 Mills Ball-, tube- 2.2 2.2 1.7 1.8 1.9 2.0 2.0 1.6 1.7 1.8 Paper machine Calender · Dryer 2.0 2.0 1.6 1.7 1.8 2.0 2.0 1.6 1.7 1.8 Wire-related Wire draw & twine m/c 2.1 2.0 1.6 0.1 0.2 1.7 1.7 1.2 1.3 1.4 2.0 2.0 1.6 1.7 1.8 Compressor Piston-, turbo- 2.0 2.0 1.6 1.7 1.8 Fans · Blowers Axial flow · Roots 2.0 1.8 1.3 1.4 1.5 1.8 1.8 1.4 1.5 1.6 2.0 2.0 1.6 1.7 1.8 Servo (Peak power/rated power) Spindle Textile m/c Woodworking m/c Pump Generator · Exciter Rubber plants · Sawmill plant Press · Bookbinder Drill press · Pelletizer Centrifuge Packer Conveyor Medical devices · Gauges Induction- Motor Drive motor type Table 1d - Load correction factor (Ko) for EV5GT/EV8YU

Table 2 - Speed Ratio Correction Coefficient Kr

Table 2 - Speed ratio correction factor (K_r)
Speed ratio Factor (K_r)
1.00 to 1.25 0.0
1.25 to 1.75 0.1
1.75 to 2.50 0.2
2.50 to 3.50 0.3
3.50 or more 0.4

Table 3 - Tension Pulley Correction Coefficient Ki

Inside Outside At belt slack side 0.1 0 At belt tight side 0.2 0.1 At belt slack side 0 0.1 At belt tight side 0.1 0.2 At belt slack side 0 0.1 At belt tight side 0.1 0.2 No idler With idler* (n = no. of idlers) Correction factor (Ki) Idler position in operation MISUMI series: 0 0.1 x (n-1)* Table 3 - Correction factor (Ki) - for idler use MXL, XL, L, H, T S_M, MTS_M P_M UP_M 2GT 3GT UP_M EV8YU

Table 4 - Start-up Frequency Correction Coefficient Km

Up to 10/day 0.1 11 to 100/day 0.2 101 to 500/day 0.3 Over 500/day 0.4 Factor (Km) Start/stop freq. (Rate) MISUMI series: Table 4 - Factor (Km) - Start/stop load EV5GT EV8YU

Related articles

Chains and sprockets: How they work together

Chains and sprockets are important elements in the design and mechanisms of machines and equipment. They are indispensable when it comes to the mechanical transfer of motion and force. But what types of chains and sprockets are there and what are their specific characteristics?

Rotary MotionTransmissionTransport
10 Minutes read

Conveyor technology - Specifications and selection of conveyor timing belts

Conveyor timing belts are a particularly efficient and versatile drive solution in conveyor technology. Unlike conventional conveyor belts or chain drives, they offer synchronized and therefore slip-free power transmission. They are indispensable in many applications. However, there are a few factors to consider when selecting.

ConstructionTransmissionTransport
7 Minutes read

Cooling and cleaning in production - Air nozzles and spray nozzles

From machining, to welding processes or along the conveyor: In modern manufacturing, precise cooling and reliable cleaning are essential for quality, process reliability and productivity. Air nozzles and spray nozzles offer flexible solutions - from precise blow-off to liquid surface wetting. In this blog, you will learn which nozzle types are suited for which applications, how jet shape and spray angle impact the effect and what really matters when selecting, designing and integrating into the system.

Basic knowledgeConstruction
12 Minutes read

Spring plungers overview - Functions, types, materials and mounting types

From locking, positioning to ejecting - spring plungers are small but crucial components in machines, fixtures and automated systems. Their variety of designs, materials and mounting styles makes them extremely versatile - but also require explanation. In this article, you will obtain a practical overview of the most important functions, types and materials as well as valuable information on the correct selection and professional installation.

ConstructionPositioning
14 Minutes read