![]() ![]() Since we actually need that speed to be in rotations per second, we just divide by 60 (1 min = 60 seconds). ![]() 1 rotation per second is equivalent to 2π radians per second, so you just plug in 2π for proper conversion. The angular speed is in units of radians per second. Since we typically work with motor speeds of RPMs, rotations per minute, we need to do some substituting. So, if you have torque specs of 885 in-lbs, you’ll need to convert it to 100 Nm. I’ll spare you the details, here’s the Wolfram Alpha conversion if you want to double check. If you want to use in-lbs of torque, you’ll need to add in another step. P is power, in Watts, is torque, in Nm, and is the angular speed. For ease of explanation and analysis, let’s assume this is all combined together as “the motor.” The motor, gearbox, and chuck together are what deliver cordless drill/driver or power tool performance. Let’s talk about the relationship between a cordless power tool’s motor’s power, torque output, and speed.įor the sake of simplicity, we should consider the entire power transmission system as one component. The issue with this, or at least consumers’ frustrations, is that no other brands use UWO outside of Dewalt and other Stanley Black & Decker power tool brands. However, maximum torque ratings alone can lack context.ĭewalt adapted UWO as a way to combat the misconception that the higher the torque rating, the faster a drill can perform or complete an application. Torque is a measure of a tool’s ability to produce turning force, and is often used as a way to compare different cordless drills and other power tools with respect to power. It can be considered as a measure of a drill’s ability to perform work, and is a function of torque and speed. Unit watts out is a measure of the power output that can be achieved by a cordless power tool’s motor and drive components. If you’re not in the mood for math, stop here! UWO, or Unit Watts Out: What Does it Mean? What follows is a detailed explanation about how and why UWO simply can’t be converted to a torque rating. In North America, Dewalt, Craftsman, Porter Cable, and other Stanley Black & Decker cordless power tool brands generally do not publish the maximum torque specs of their cordless drills and drivers.Ĭan you convert UWO, or unit watts out, to a maximum torque rating, to allow for easier comparison across multiple brands? UWO is intended to give a fuller picture of a cordless drill’s power or performance potential than torque specs alone. Let’s say you have a Dewalt cordless drill with 340 UWO rating, and a Craftsman cordless drill with a 280 UWO rating. ![]()
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