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 Gear Tooth Sensor Housing is now included with the sensor and you may also download it form Thingiverse. The Half Size Enclosure may also be downloaded from Thingiverse.
NEW - You may now select your sensor when you purchase a kit. The choices are IR Reflective, IR Slotted, and Hall Effect. Download the user documentation for more information on sensors.

MachTach Half Size Enclosure 3D Design File