To use this website, you must have Javascript and cookies enabled on your browser. The diameter d of the tool is instrumental in calculating cutting speed and rotational speed. Starting with the available drive and its rotational speeds, it is possible to perform a back-calculation to determine which tool diameters can be used on the available drive. The cutting speed v is the speed at which a tool bit moves through the material to be worked in the direction of the cut, removing a chip.

The drive rotational speed n is given in revolutions per minute [rpm]. We have discovered that you are coming from another country. Do you want to switch to the site for that country? PFERD rotational speed calculator Calculate the ideal rotational speed, tool diameter or cutting speed. Drive operating speed Diameter Select cutting speed What would you like to calculate? Drive operating speed Diameter Select cutting speed.

### SFM to RPM Calculator

Calculate the diameter d of the tool here. Drive operating speed n min Diameter d. Calculate the cutting speed v here.

Diameter d mm. Calculate the ideal rotational speed n.

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Note: The rotational speed data for the tools relates to their use under load. Drive operating speed n.

Welcome We have discovered that you are coming from another country.All Inch inputs and dimensions are actual physical finished sizes unless otherwise noted. All Metric Inputs in Millimetres unless otherwise noted. What is an RPM?

The RPM of the first driven large pulley is transferred to second set small driver pulley and so on. The sets of pulleys will be drawn at the bottom of the page with each set RPM reductions and total RPM reduction through all entered sets. In this instance, the initial small driver pulley RPM is The small pulley diameter is 6"large pulley diameter is 12" and centers is 16".

The second set small pulley diameter is 7"large pulley diameter is 12" and centers is 18". Metre Meter.Rpm, or rotations per minute, measures the rotational speed of an object. If you want to convert a rotational speed to a linear speed, such as miles per hour, you need to know the diameter of the circle the object spins around.

The larger the diameter, the larger the circumference, meaning the longer the distance covered. When converting, you need to make sure you convert the units properly, which is easier when using a calculator.

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First, enter the diameter in feet and multiply it by pi, which is approximately 3. For example, if the diameter of a tire is two feet, then the circumference is 6. Multiply this by the rotational speed. Divide this number by 5, which converts feet per hour to miles per hour.

Push the equal sign to see the speed in mph. In this example, when you push the equals sign, your calculator displays 7. Mark Kennan is a writer based in the Kansas City area, specializing in personal finance and business topics. Multiply this number by 60 to convert it from feet per minute to feet per hour. About the Author. Copyright Leaf Group Ltd.However, converting RPM to speed is still easy enough after you convert the RPM to a more standard measure of angular velocity.

RPM is a measure of the number of complete revolutions in a minute. For example, if a wheel is rolling so it completes one full revolution per second, in 60 seconds it will have completed 60 revolutions, and so it would be rotating at 60 RPM. For example, if a wheel completes 30 revolutions in 45 seconds i.

The formula you need is:. For example, with the wheel in the previous section traveling at 40 RPM, you convert to angular velocity as follows:. From this point onward, the conversion from RPM to linear speed is straightforward. For example, with the wheel rotating at 40 RPM, i.

## Motor Top Speed RPM Calculator

For example, if you were swinging a yo-yo in a giant circle, but the string broke, the yo-yo would fly off in whatever direction it was traveling in at the instant the string broke. Lee Johnson is a freelance writer and science enthusiast, with a passion for distilling complex concepts into simple, digestible language. He's written about science for several websites including eHow UK and WiseGeek, mainly covering physics and astronomy.

He was also a science blogger for Elements Behavioral Health's blog network for five years. He studied physics at the Open University and graduated in About the Author. Photo Credits. Copyright Leaf Group Ltd.A vehicle transfers power from the engine through the transmission and differential. The gears in these components result in a wheel speed expressed in revolutions per minute rpm. From the wheel speed rpm, the size of the tire determines the final road speed of the vehicle. The calculations can be applied to any vehicle, from a bicycle to a semi-truck. Calculate the circumference of the wheel in feet from the diameter. The formula for circumference is the diameter times pi.

Pi is a mathematical constant and is 3. For example, if the wheel is 30 inches in diameter the circumference would be Divide by 12 to get 7.

## Tire Size Calculator

Calculate wheel revolutions per mile by dividing 5, by the tire circumference in feet. The example tire will make Calculate the speed per minute by dividing the wheel speed by the tire revolutions per mile.

For example, if the wheel speed is rpm, the example tire is moving at 0. Multiply the miles per minute speed times 60 to convert the speed to miles per hour mph.

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Step 1 Calculate the circumference of the wheel in feet from the diameter. Step 2 Calculate wheel revolutions per mile by dividing 5, by the tire circumference in feet. Step 3 Calculate the speed per minute by dividing the wheel speed by the tire revolutions per mile. Tip If the calculations need to be made numerous times, a spreadsheet can be set up with the calculations.RPM, defined as revolutions per minute, is an internationally accepted expression of rotational velocity.

It refers to the number of revolutions a rotating object makes on its own axis in one minute. Determining RPM is relevant for virtually every rotating entity known to man. RPM is used with many key parameters such as diameter, mass and torque in fixed engineering formulas to calculate horsepower, linear velocity, gear ratios and tangential velocity.

Conversely, a number of measurements can be made in any given system to calculate RPM. Since there is no one formula, several examples are provided below.

### RPM to km/hr Converter

Calculating RPM of a wheel on a vehicle: An automobile is traveling in a straight line at 60 miles per hour. The outside diameter of each wheel is 27 inches. What is the RPM of the wheels? A small diesel engine produces 3 horsepower with 6 pound-feet of torque at what RPM? A small transmission in a mixer has a tooth gear on the motor shaft driving a tooth gear on the mixer blade.

The motor is turning at 1, RPM. What is the mixer blade speed? A tachometer has a magnetic pulse sensor next to an iron gear on a motor shaft.

There are 30 teeth on the gear. The pulse readout indicates 90 pulses per second. What is the RPM of the motor shaft? The Earth spins on its own axis one revolution each 24 hour day. What is the Earth's RPM? This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. Tachometer RPM A tachometer has a magnetic pulse sensor next to an iron gear on a motor shaft. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Calculate metric or inch tire specs and compare to alternate tire sizes.

View size results with our tire visualizer and side by side comparison including speedometer error using the comparison tab. Use our tire size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tire.

Just type in a metric or standard size tire and click calculate. Inch measurement tires are fairly easy to understand however metric tires use a more difficult system to read. The first number on a metric tire is the width in millimeters. Divide this number by The third number generally preceded by an "R" is the wheel diameter. The sidewall or aspect ratio are used in metric tire sizes to determine the overall height of a tire.

The second number on a metric tire is to calculate the side wall measurement. The sidewall height is a percentage of the width of the tire. This second number is that percent. Our tire calculator makes this happen for you. Just type in any tire size and click calculate.

It also solves the problem of deciding what tire you would like to run if you have inch tire measurement in mind but can't find a company that manufactures that inch tire size. Just fill in the inch measurements you are looking for and it will populate suggested tire sizes that are with in one inch bigger and smaller of the entered inch tire size.

There are more possibilities and choices in metric tires so the use of a tire size calculator can be very useful.

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The tire size comparison calculator takes the measurements of two tires and compares the diameter, width, sidewall, circumference, and revolutions per mile. Then as a bonus it shows examples of your speedometer reading with the first tire, and the actual speed you're traveling if you were to install the second tire.

A very useful tire calculator when searching for tires that are a different size than stock. Another tire size calculator we have is our speedometer correction calculator. This is valuable if you plan to or are already running bigger tires than stock, and want to know the speed you are actually traveling compared to you're speedometer reading. A bigger tire has a larger circumference, thus traveling a further distance for each revolution.

A speedometer reads the amount of revolutions your tires are making, not how far you are traveling. Therefore you are actually traveling faster than your speedometer says when you have larger tires than stock, and slower than you're speedometer says if you have smaller tires.

Our easy to use tire diameter calculators will always be useful at one time or another. A tire size conversion calculator or tire diameter calculator is the best way to get the answers you are looking for when it comes to tire sizes.