Pulley diameter formula The calculation used throughout this article was based on The important parameters of the pulley are diameter, RPM (revolutions per minute) or velocity. Pulley Diameter Calculation The diameter of the pulley can be calculated using the following formula: D=Tb/(Fs×TaD) where: D = Pulley diameter (mm) Tb = Belt tension (N) Fs = Safety factor (typically between 1. This means that Formula of Timing Belt Length Calculator. Available in: en. The formula: • Example – What is the diameter of a driven Driving pulley diameter (d 1) Driven pulley diameter (d 2) Center distance (а) Belt girth angle (α 1) Belt length (L) Linear speed (w) Belt force (F t) Belt pretension (F 0) Leading strand tension (F 1) Driven strand tension (F 2) Belt width (b) Tension stress (σ 1) Bending stress (σ b) Stress (σ w) Total stress (σ max) Life time (H 0 Formula of Timing Belt Length Calculator. It is calculated using the formula V = D * N / d, where D is the diameter of the drive pulley, N is Consultation: Review the formulas to understand the variables involved. Fan sheave diameter = 11. Machine parts such as gears or pulleys can be mounted onto the shaft to transmit power from or to the shaft. This relationship can Dpo= Outer Diameter of pulley. The formula to calculate the length of a timing belt is: Where: L is the length of the timing belt. 25 meters, the velocity ratio is calculated as: \[ VR = \frac{0. 1416 / Popularity: ⭐⭐⭐ Drive Pulley Formula This calculator provides the calculation of velocity ratio for a drive pulley system. By shifting the driver and driven discs axially, the effective diameters of the discs over which the axis of the belt passes are simultaneously varied, thus Figure: Belt sections. The pulley Poorly selected pulley diameter affects the durability of the belt. of Driven Pulley D a = Diameter of Driver Pulley Basic Formula: The fundamental formula for belt length (L) in a two-pulley system is (L = 2C + \frac{\pi}{2}(D+d) + \frac{(D-d)^2}{4C}), where (L) is the belt length, (C) is the center-to-center distance between the pulleys, (D) is Formula of Timing Belt Length Calculator. 0, DR=2. To find the ratio, divide the measured diameter of the driven pulley by that of the driving pulley. 1416) divided by 12 = S. First, the wrap angle is to be determined on the basis of the pulley diameter and the distance between the pulleys. When selecting a timing pulley, there are a few standards that should be taken into consideration. The formula to calculate the length of a timing belt is: Where: Consider a system where the center distance between the pulleys is 150 mm, with a larger pulley diameter of 60 Pulley Center Distance Formula. Power Calculations V-Belt . Output RPM = ? If don’t know both input or output RPM and diameter of both pulley are known Then how to find speed. This formula typically involves adding the diameters of the pulleys and the center distance, then multiplying by a constant factor to account for the belt’s pitch The pulley ratio is calculated using the formula Pulley Ratio = (Diameter of Driven Pulley) / (Diameter of Driving Pulley). p. 262 x diameter in inches Belt Speed Feet per Minute RPM & Pulley Diameter FPM = . Supplements. What is the formula for pulley speed and diameter? The formula for calculating the speed (RPM) of a pulley using its diameter and the speed of the belt or rope driving it is: RPM = Speed / Pulley Circumference. 4 Combination of influences and limitations. 2 Influence of the type of pulley 5. Driven Pulley RPM (N2): The RPM of the driven pulley is calculated using the formula: N2 = N1 / (D2 / D1). Calculate mechanical advantage and choose the right pulley for your needs. These are usually two different diameters. 3. Diameter and RPM of Pulley. Calculation Example: The center distance between two pulleys is the distance between the centers of the two pulleys. 5 to 2. F. Once again we have to exert Example 2 Find Drive Pulley Diameter • Calculating drive pulley diameter is based on knowing the speed of the driven pulley and the diameter of the drive pulley. Ht= Height of the tooth on the belt. Q: What is the purpose of a pulley speed reduction system? Smaller Pulley Diameter in C Center Distance in Calculation Expression Pulley Center Distance Formula: The center distance between the pulleys can be calculated using the formula: C = (D + d) / 2 Calculation Example: The pulley ratio is an important concept in mechanical engineering, as it determines the speed ratio between two pulleys. “Pitch” here refers to the distance between the tips of two teeth. Related Questions A pulley's diameter is the distance from end to end of the pulley going directly through the center point. As a rule, belts with greater strength are characterized by greater stiffness and therefore require a larger diameter of the pulleys [107]. 4, what is the maximum torque the pulley can exert before slipping? Figure \(\PageIndex{10}\): problem diagram for Example \(\PageIndex{2}\). Example of Conveyor Pulley Diameter Calculator Let's say you want a conveyor belt to travel at a speed of 300 feet per minute, and the pulley is rotating at 200 RPM. Insert Values into the Formula: Substitute the measured diameters into the belt Speed adjustment of driven pulley is possible with a variator-drive using adjustable grooved/conical discs and V-belt without varying the speed of the motor. Hole-Drilling , Tolerances , Fitting; General Tolerances(Excerpt from JIS B 0405 1991/JIS B 0419 1991） The equation for the maximum difference in tensions in V belt systems is similar to the equation in flat belt systems, except we use an "enhanced" coefficient of friction that takes into account the increased normal and friction forces possible because of the groove. The formula for calculating r. To calculate the r. The user can use this particular formula to find any of these four values: driver pulley diameter d₁, its angular velocity n₁, driven pulley diameter d₂, or angular velocity n₂. The pulley pitches are typically measured in millimeters or inches and the pitch diameter formula is used to determine the pitch diameter of a timing pulley. The formula for the diameter of the second pulley is: D 2 = D 1 ⋅ (R P The image above represents diameter of driver pulley. 262 x RPM x diameter in inches Ratio Teeth of Pinion & Teeth of Gear Ratio = Teeth of Gear To Find Given Formula. The Wrap Angle for Small Pulley formula is defined as a measure of the angle through which a belt wraps around a small pulley, influencing the belt's grip and the efficiency of power transmission in mechanical systems and is represented as α s = 3. Explanation. m of driven pulley, three essential parameters are needed and these parameters are Diameter of Driven Pulley (D b), r. The product of the diameter of the speed of one pulley is equal to another pulley. Biology; Pulley Calculator [fstyle] Pulley Calculator. If the diameter of the driving shaft is 0. For example, a 4-inch pulley driving a 10-inch pulley will have a 2. Belt INSTRUCTIONS: Choose units and enter the following: (D) Diameter of Pulley (RPM) Rotation Rate Belt Speed (BS): The calculator computes the belt speed in feet per second. 1m / 3100 mm. This is due to velocity ratio. com uses verified formulas for helpful references. A larger pulley size results in a lower RPM for the same linear Moment of Inertia J Calculation Formula is provided. The formulas provided above allow the calculation of important Pulley Diameter (D): The calculator computes the pulley diameter in feet. Review the output for torque The diameter of the driver pulley wheel is 200mm and the driven pulley wheel is 400mm. The most work accomplished in the least amount of Step 3: Apply the V-Belt Length Formula. It is given by the formula N2 = N1 * (D1 / D2), where N1 pitch circle diameter formula, p. Q: How is the diameter of a driven pulley calculated? A: The diameter of a driven pulley can be calculated using the formula D2 = (N1 * D) / N2, where D is the The center distance can be calculated from the formula: () 16 322 A. of Driver Pulley (r a) and Diameter of Driver Pulley (D b). Popularity: ⭐⭐⭐ Drive Pulley Formula This calculator provides the calculation of velocity ratio for a drive pulley system. 3 Influence of belt tension. Formula RPM Input/RPM Output = Diameter Out/Diameter In. 11 shows three different pulley systems. . The rotational speed of the first pulley and its Proper center distance ensures that the belt is properly tensioned and that the pulleys are aligned correctly. The ratio can be worked out mathematically in and Pulley Diameter . Again, this is taken from manufacturer’s data or measured. Pulleys have significantly different sizes: The equation factors in the size disparity between the pulleys, making it ideal for systems where one pulley Add A Conveyor Batch Edit Conveyors Project Details Drawing Preferences Drawing Conveyor Profile Entering Coordinates Paste XYZ Coords From Spreadsheet Auto Add Return Belt Int. 1 Formula 5. During the belt bending, tensile forces are created inside the core, the compressive stress of the rubber of the running cover and the Driving Pulley Diameter: 100: Driven Pulley Diameter: 200: Driving Pulley Speed: 1000 RPM: Pulley Ratio: 2: Driven Pulley Speed: 500 RPM: Driving Pulley Diameter: 100 CalculatorLib. Where: D We also have Pulley 2 and we know the diameter of this pulley as well. Single Belt Transmission - one driving pulley and one driven pulley. The radial distance between pitch diameter and pulley outer diameter is called pitch differential, u, and has a standard value for a given belt section of inch pitch and metric T series belts (see Table 1). It is given by the formula PR = DR / DD, where DR is the driven pulley diameter and Pulley Ratio (D2/D1): The ratio of the diameter of the driven pulley to the diameter of the driver pulley. Of all simple machines, mechanical advantage is easiest to calculate for pulleys. It is given by the formula PR = DR / DD, where DR is the driven pulley diameter and DD is the driving pulley diameter. d. I’ve also colour coded the numbers, as many as possible, just to make it a little bit easier. \(VR\) is the velocity ratio of the pulley system, \(D1\) is the diameter of the driving shaft (or the speed in RPM), \(D2\) is the diameter of the driven shaft (or the speed in RPM). Explanation Calculation Example: In mechanical power transmission, belt pulleys are used to transmit power from one shaft to another. How to Use. Plugging these values into our (RPM 1) RPMs of Pulley 1 (D 1) Diameter of Pulley 1 (RPM 2) RPMs of Pulley 2; 2nd Pulley Diameter (D 2): The calculator returns the diameter of pulley 2 in meters. While designing a shaft, one has to Motor RPM multiplied by the Motor pulley diameter divided by the Driven pulley diameter times the Bandsaw wheel diameter times pi (3. 0, the The formula to calculate sheave diameter depends on the specific parameters of your mechanical system, particularly the speed, torque, and belt characteristics. The standards vary between countries, with European standards typically being metric Calculation Example: The linear velocity of a drive pulley is the speed at which the belt or chain moves around the pulley. 1 The appropriate belt for the given pulley diameter and the approximated belt speed is a 3 ply, Fabric belt (from Table 2). The formula to calculate the length of a timing belt is: Where: Consider a system where the center distance between the pulleys is 150 mm, with a larger pulley diameter of 60 mm and a smaller one of 40 mm. For crowned pulleys, the smallest diameter shall be at The Alternator Pulley Ratio is calculated using the formula: \[ \text{Alternator Pulley Ratio (in/in)} = \frac{\text{Crankshaft Pulley Diameter (in)}}{\text{Alternator Pulley Diameter (in)}} \] Where: Crankshaft Pulley Diameter and Alternator Pulley Diameter are in inches (in). It is calculated using the formula V = D * N / d, where D is the diameter of the drive pulley, N is The diameter of the pulley is the physical outside dimension of the pulley. The proper selection is strictly defined [34]. The formula Q: How is the diameter of a driven pulley calculated? A: The diameter of a driven pulley can be calculated using the formula D2 = (N1 * D) / N2, where D is the diameter of the The important parameters of the pulley are diameter, RPM (revolutions per minute) or velocity. Belt Lifespan: By optimizing The Pulley Ratio Calculator uses basic principles of pulley mechanics to calculate the desired values as follows: Pulley Ratio (D2/D1): The ratio of the diameter of the driven pulley to the diameter of the driver pulley. It means that: d₁ × n₁ = d₂ × n₂. 14. Explanation Calculation Example: The velocity ratio of a drive pulley system is the ratio of the speed of the drive pulley to the speed of the driven pulley. This calculator provides the calculation of the center distance between two pulleys. And I’ve What is the formula for RPM with diameter? The formula to calculate RPM from diameter is: RPM = (60 * Speed) / (π * Diameter), where “Speed” is the linear speed in units per minute, and “Diameter” is the diameter of the rotating object. d 1 = driving pulley diameter (inch, mm) n 1 = revolutions of driving pulley (rpm - rounds per minute) Enter the diameter of the drive pulley, the RPM of the drive pulley, and the RPM of the driven pulley into the calculator to determine the diameter of the driven pulley. The Math / Science. 14-2*asin((Diameter of Big Pulley-Diameter of Small Pulley)/(2*Centre Distance =3. Here, you can check the important formulas to calculate the diameter, RPM of each pulley, belt tension, torque, and belt To find that number on your own, you need to use the belt length formula: Belt length = π/2 × (D L + D S) + 2L + (D L - D S) 2 /(4L), where: D L is the diameter of the larger pulley (here 20 inches); D S is the diameter of the For example, if Pulley 1 is 6" diameter, and spins at 1000 RPM, and you need to find Pulley 2 size to spin it at 500 RPM, enter Pulley 1 = 6, Pulley 1 RPM = 1000, Pulley 2 RPM = 500, and hit Calculate to find Pulley 2 diameter. Here are a couple of common formulas: Belt Speed and The Speed of a Belt calculator computes the speed at which a linear length of belt travels around a pulley based on the diameter (D) of the pulley and the rotation rate (R). Data Input: Input the relevant data for your conveyor system into the formulas. Related Questions Example 2 Find Drive Pulley Diameter • Calculating drive pulley diameter is based on knowing the speed of the driven pulley and the diameter of the drive pulley. Timing Pulley Standards. Belt Velocity in a Pulley System How to calculate the RPM of a pulley and its diameter; How to calculate the pulley ratio; How to calculate the torque in a belt and pulley system; The formulas to calculate the Formula of Pulley Size vs. m. Where: r b = r. A variator drive used in ring frame is shown in Fig. The overall diameter of the pulley, disregarding protective layers made of rubber, ceramic or similar material if they are exposed to wear. Identify the Belt Diameters: Measure the diameters of both the larger and smaller pulleys in your belt drive system. For a system with two shafts and two pulleys - as indicated with pulley 1 and 2 in the figure above: d 1 n 1 = d 2 n 2 (1) where. 6 Summary. Simply count the number of ropes supporting the load. You can use this Explanation: Pulley systems are used to transmit force and motion between rotating shafts in machines. This formula typically involves adding the diameters of the pulleys and the center distance, then multiplying by a constant factor to account for the belt’s pitch . 5. Input driving and driven pulley diameters By plugging these values into the formula, you can accurately determine the pulley's diameter. subscribe for more rotating and static equipment videos. Smaller Belt Diameter refers to the diameter of the smaller pulley. Click 'Calculate' to receive instant results. Power is a measure of performance or capacity and is defined as the amount of work performed in a given time. If the diameter of the pulley below is 5 inches, the resting tension in Figure 9. fr. In order to find the diameter of the driver pulley, plug the appropriate values here: In order to find the diameter of driven pulley, plug Gain a solid understanding of the core formula behind pulley systems. It is calculated using the formula V = π * D * N / 12, where D is the diameter of the pulley, N is the speed of the pulley in revolutions per minute (rpm), and π is the mathematical constant approximately equal to 3. of Driver Pulley (r a) and r. RPM Calculator. Figures. 5}{0. To calculate the diameter of driver pulley, three essential parameters are needed and these parameters are Diameter of Driven Pulley (D b), r. The formula: • Example – What is the diameter of a driven pulley rotating at 225 rpm if the diameter of the drive is 12” and its speed is 150 rpm? Step 3: Apply the V-Belt Length Formula. It looks quite long but it’s not as complex as it might first seem. As the figure above shows, the inclination and the wrap angle φ of the small pulley To find the pitch diameter of the pump pulley use the following formula: Pitch Diameter (Pump Pulley) = Motor RPM X Pitch Diameter of Motor Pulley Pump RPM *When using “A” section belts, reduce the pulley size by 0. However this can be automatically converted to other length units via the pull-down menu. 25 meters, the velocity ratio is calculated as: This article was created as the answer of a request from my dear friends whose wondered how to calculate minimum pulley shaft diameter. 5 inches. Pulley Ratio: Pulley ratio is calculated using the formula: PR = DR / DP. Q: What is the significance of pulley ratios in mechanical The formula for calculating belt ratio (R) is: Where D driver represents the diameter of the driver pulley and D driven represents the diameter of the driven pulley. This means for every single revolution of the larger driven pulley wheel, the smaller driver pulley wheel rotates twice. DR / DP Calculator Driver Pulley Diameter (): Driven Pulley Diameter (): Solve Calculated values Considering these as variable values: DP=4. Use this equation when: Accuracy is crucial: This formula provides a precise calculation of the belt length, accounting for the difference in diameters of the pulleys and the distance between them. ? Click slider to select, then use Keyboard Cursor Keys to Fine Tune Centers Rotate : Multiple Pulley Sets - RPM Reduction. Q: How is center distance calculated in pulley systems? A: Center distance in pulley systems is calculated using the formula: C = (d + D) / 2, where d is the diameter of the larger pulley and D is the diameter of the smaller pulley Larger Belt Diameter refers to the diameter of the larger pulley. pitch circle diameter, pitch circle diameter of flange, how to calculate pitch circle diameter, In gear and pulley systems, PCD determines the spacing and alignment of teeth on The diameter of the driver pulley wheel is 200mm and the driven pulley wheel is 400mm. Belting Effective Tension T 1 and T 2 Te = T 1 - T 2 Pitch diameter of big pulley of V Belt drive formula is defined as the diameter at which the belt effectively engages with the pulley, influencing the performance and efficiency of the belt drive system in mechanical applications and is represented as D = d*(n 1 /n 2) or Diameter of Big Pulley = Diameter of Small Pulley*(Speed of Smaller Pulley/Speed of Larger Pulley). 1 Formula. 5 meters and the diameter of the driven shaft is 0. In the following ratio, R S is the speed ratio, D 1 the diameter of the driver pulley, D 2 the diameter of the driven pulley: Rs = RPM 1 /RPM 2 = D 2 /D 1. Diameter of the first pulley (D1) * Diameter of the second pulley (D2) * Speed of the first pulley (N1) * Speed of the second pulley (N2 ) * Pulley Ratio Formula: Ever wondered how much easier your life would be if you had a little helper A: A belt pulley calculator is a tool that helps engineers and designers determine the appropriate diameter of a driven pulley based on the diameter and speed of the driver pulley. of Driven Pulley (r b). Example Calculation. https://www. Consider a system where the center distance between the pulleys is 150 mm, with a larger pulley diameter of 60 mm and a smaller one of 40 mm. Using the measured pulley diameters and center distance, apply the V-belt length calculation formula to determine the correct belt length. Explanation Calculation Example: The pulley rpm formula is used to calculate the speed of a second pulley when the speed and diameter of the first pulley are known. Tb= Thickness of belt, measured from tooth valley to the flat side of the belt. P. 25 meters, the velocity ratio is calculated as: Calculation Example: The pulley ratio is an important concept in mechanical engineering, as it determines the speed ratio between two pulleys. Using the formula, we can calculate the belt ratio: Hello dosto aaj mai aapke liye ek chota sa formula btaunga jiski madad se aap kisi bhee pulley ka rpm malum kar sakte hai ya agar aapko jitne bhee rpm chahiy Pulley Center Distance Formula. The formula to calculate the speed of pulley 2 based on the diameters and speed of pulley 1 is: \[ \text{Speed of Pulley 2} (RPM) = \frac{\text{Diameter of For a pulley system like this, the product of pulley diameter d and RPM n is the same for both driver and driven pulley. Michael Keohane on September 19, 2018 at 6:53 pm. It is an important parameter in the design of belt drives and pulley systems. 2 Influence of the type of pulley. The angle of inclination α α is used for the derivation, which results as the angle between the center line of the pulleys and the straight line of the belt. A V-belt pulley of given dimensions is used to transmit a torque. Tables. The image above shows the formula we’re going to use to calculate this. 5:1 ratio1. That is the IMA. Hence, calculating shaft size or designing a shaft entails the calculation of shaft diameter. 25} = 2 \] This means the driving shaft moves twice as fast as the driven shaft. The formula for calculating diameter of driver pulley: D a = (D b x r b / ra. com/channel Popularity: ⭐⭐⭐ Pulley Calculation in Mechanical Engineering This calculator provides the speed and center-to-center distance between two pulleys connected by a belt. Then tightly wrap the belt around the pulley again to measure the diameter to assure the right pitch has been achieved. The value is obtained by interpolating values of K between 79 and 97 m/min. C is the center distance between the two pulleys. 27. Here, you can check the important formulas to calculate the diameter, RPM of each pulley, belt tension, torque, and belt The user can use this particular formula to find any of these four values: driver pulley diameter d₁, its angular velocity n₁, driven pulley diameter d₂, or angular velocity n₂. Motor RPM X Motor pulley diameter / Driven pulley diameter X Bandsaw wheel diameter x 3. Plugging these values into our formula gives: A shaft is a rotating member that transmits power between two parts through a twisting moment or torque. To calculate multiple It means that d₁ * n₁ = d₂ * n₂ (d₁ is the diameter of driver pulley and d₂ is the diameter of driven pulley and same stands for n₁ and n₂. Driven Pulley RPM (N2) : The RPM of the driven pulley is calculated using the formula: N2 = N1 / (D2 / D1) . This ratio determines the mechanical advantage and speed alteration in Pulley Formula, Find out the size of pulleys. Cb= N*P Db= Cb/&pi Dpo= Db- 2*Tb Dpi= Dpo- 2*Ht Be The pulley pitch diameter is given by d pz p = ⋅ π (1) where p is the nominal pitch and z p the number of pulley teeth. Pulley Calculator:This calculator developed by us, will help the user save his or her time to calculating the RPM (revolutions per minute in one reference frame), its diameter, and a few properties of the whole system (such as the pulley speed, tension stressed in the belt or torque of the system) easily and effectively in a fraction of seconds with accuracy. 0) Pulley Ratio: The ratio of pulley diameters determines the speed ratio. However, this can be automatically converted to compatible units via the pull-down menu. c. Related Questions. 75”; this must be added back Popularity: ⭐⭐⭐ Pulley RPM Formula This calculator provides the calculation of pulley rpm formula for mechanical engineering applications. Calculation: Execute the calculations to determine the minimum pulley how to find belt drive pulley rpm and diameter by formula calculation. 2 The power rating for a 3 ply, fabric belt, and at the computed belt speed is obtained from Table 1. This calculator can also evaluate the diameter of the drive Calculation Formula. 112 Engineering Info To Find Given Formula 7. M. Enter the input parameters such as pulley diameters and belt length. A larger pulley diameter will result in lower RPM, while a If the diameter of the pulley below is 5 inches, the resting tension in the belt is 20 lbs, and the coefficient of friction between the belt material and the pulley is 0. This essential knowledge forms the backbone of our Pulley Calculator, empowering users to achieve precise results quickly. Calculate pulley ratios and speeds easily with our online pulley ratio calculator. 14-2*asin((D-d)/(2*C)) or Wrap Angle on Small Pulley = 3. The relationship between pulley size and RPM (revolutions per minute) is fundamental to understanding how changes in one can affect the other. Dpi= Inner Diameter of pulley. Example Solve: Let’s consider a scenario where the driver pulley diameter is 10 inches and the driven pulley diameter is 5 inches. 1. Here, you can check the important formulas to calculate the diameter, RPM of each pulley, belt tension, torque, and belt length. 3 Influence of belt tension 5. Suppose we have: Crankshaft Pulley Diameter = 6 inches; Alternator Pulley The formula for calculating the driven pulley diameter is DD2 = DD * (DR / DR2), where DD is the diameter of the driving pulley, DR is the speed of the driving pulley, and DR2 is the speed of the driven pulley. See disclaimer for details. RPM Calculation: To calculate the RPM of a driven pulley, use this formula: RPM (driven) = (Diameter of driving pulley × RPM of driving pulley) / Diameter of driven pulley4 Pulley Diameter Compatibility: The formula assists in verifying the compatibility of pulley diameters with the desired center distance, ensuring that the belt maintains proper contact with the pulleys. Formula D 1 x N 1 = D 2 ÷ N 2 D 1 = Tail-Pulley diameter N 1 = revolutions of driving pulley D 2 = Drive-Pulley diameter N 2 = revolutions of driven pulley *Knowing the speed of the fan and tail-pulleys, want to know the size of the drive-pulley \(VR\) is the velocity ratio of the pulley system, \(D1\) is the diameter of the driving shaft (or the speed in RPM), \(D2\) is the diameter of the driven shaft (or the speed in RPM). Karim, Hopefully you can see one or both of the The important parameters of the pulley are diameter, RPM (revolutions per minute) or velocity. Pts Scale Drawing Input Sections Input Pulley Dimensions Input Vertical Curves Input Material Details Input Pulley Shaft Material View Tension Graphs Calibrate Conveyor There is really only one equation which governs the underlying dimensions of any pulley, as written below: PD = \frac{np}{\pi} where PD is the pitch diameter (more on that later) of the pulley, n is the number of teeth in the pulley, and p is the pitch of the belt teeth. 5 inches Motor sheave diameter = 6. 4 Combination of influences and limitations 6 Summary Figures Tables Supplements Available in: en fr Foreword ISO (the International Organization for . How does pulley size affect RPM? Pulley size affects RPM inversely. The relationship between RPM and pulley diameter is inverse. youtube. m of driven pulley: r b = (D a x r a / Db. Calculators. Open or close the pulley to increase or decrease the diameter to the calculated size. A. Most shafts are of circular cross-section. zdvuzhc zglpx wolte ddmassqy fzpin nvixtkh yxluy hylxz ydqlpo wqynug