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 ...

Normally, non-contact tachometers are optically coupled ... and with a little analysis and some simple math, the shaft speed of the machine can be determined. [Matthias] explains how to exclude ...

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 ...