The MachTach is a machine tachometer which is used to display the speed of any machine tool. The MachTach is capable of displaying revolutions per minute (RPM), surface feet per minute (SFM), and surface meters per minute (SMM). The MachTach can be built in two sizes using the same parts and it can be installed inside your machine tool or in it's own optional enclosure.

This site has MachTach documentation, photos, and video links. If you would like to build a MachTach, there's a page with information on how to buy MachTach kits or parts.

Displays RPMs and Surface Feet per Minute (SFM)
Metric Version displays Surface Meters per Minute (SMM)
& has mm diameter entry
Machine Tachometer
NEW - MachTach V2.6 Kits are now shipping. The new MachTach includes the new software with SAE and Metric modes and uses a terminal block instead of a connector for the sensor cable.
NEW - MachTach User's Manual V2.6e is now available on the Docs page. This latest revision has instructions for the new IR Reflective Sensor which already has wire leads.