This tutorial will guide you through the process of building a tachometer around an Arduino. Tachometers are used to measure rotation rate in Revolutions Per Minute (RPM). You don’t need much in ...

But entry-level CNC routers don’t often include a spindle tachometer, forcing the operator to basically guess at the speed. This DIY optical spindle tach aims to fix that, and has a few nice ...

Yet almost all tachometers share one common and perhaps ... with popular suppliers such as Hurst (for the floor-mounted four-speed shifter) and championed ram-air intakes, a wide track, big ...