For the sake of simplicity, let’s assume a router speed of 20,000 rpm:ġ-inch diameter router bit speed = 3.142 in. What we get are results expressed as inches per minute. Rim Speed = circumference x router speed (RPM) Now we can calculate the rim speed-or the speed at any point along the outside edge of the cutting router bit-using the following equation: Let’s first calculate the circumference of a few simple bits sizes for example:ġ-inch diameter bit = 3.142 x 1 in. Let’s start with a few different circumferences:Ĭircumference = π x (router bit diameter) The formula for calculating rim speed has you finding the circumference of the bit, calculate that to inches per minute, and eventually translating it to miles per hour. To understand just how the bit diameter affects speed, let me walk you through a few examples. How Fast is That Router Bit Speed Really? Setting the best router bit speed begins with understanding that cutting takes place along the rim. You can’t clock that, so use the RPM as a proxy for rim MPH. Generally, the rim speed will be around 100 to 120 miles per hour. (Please refer to the manufacturers’ recommendations and keep in mind the speeds they suggest are maximum): Diameter Here’s a general guide, or router bit speed chart to get you started. Of course, running bits too slowly can also cause vibration that damages the stock. It can also exaggerate even the tiniest imbalance in the bit or router and cause vibration or a dangerous bit failure. It’s the difference between a moderate acceleration and leaving Back to the Future DeLorean tire rubber fires. However, suffice it to say it’s an unsafe speed-for both the wood and the user-on the larger bit. Without the proper context that may not seem terrible. The rim speed difference at equal RPMs is more than twice that for the 3.5-inch bit than the 1.5-inch one! Some basic geometry quickly illuminates the fact that 1.5-inch diameter and 3.5-inch diameter bits running at the same RPMs have dramatically different rim speeds at the edge. They can be from larger plunge routers like the Triton TRA001 or smaller trim routers like the Milwaukee M18 FUEL router. Grab a couple of router bits with dramatically different diameters to get a sense of the importance of rim speed. The Prius quickly outsold the Insight (via Washington Post).Why You Need to Set Your Router Bit SpeedĪs a general rule of thumb, the router bit speed has to do with what we call rim speed. Its styling was also less 'out there' than the futuristic shape of the Honda, and it had an automatic transmission from its debut. around the same time (via Motor Trend), offered a more practical four-door sedan layout. The contemporary Prius, which hit the U.S. There were, however, plenty of drawbacks to the design. With light-footed driving, the car could put up even higher figures out on the highway (via NYT). Thanks to its scant weight, aerodynamic shape, and electrified power, the first Insight achieved an EPA rating of 53 miles per gallon. Initially, a five-speed manual transmission was the only gearbox available on the Insight, but a CVT was later offered in 2001 (via Car and Driver). Power was supplied by a 1L three-cylinder engine conjoined with a ten kilowatt electric motor at the flywheel. This frame underpinned a compact three-door coupe body that weighed under 2,000 pounds. Honda built the chassis as small and lightweight as possible, using an aluminum space frame derived from the previous NSX sports car (via Hagerty).
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