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, Surface Feet per Minute (SFM)
and Surface Meters per Minute (SMM)
using inch and mm diameter entry
Machine Tachometer
NEW - 3D Printed Enclosure design for Half Size MachTach is now available on Thingiverse. Now you can print your own enclosure.  More enclosures and sensor brackets are coming. Let us know what you would like to see.
MachTach Half Size Enclosure 3D Design File