This homemade CNC mill is based on a conventional Proxxon FF230 mini mill. The X and Y joints are modified for CNC compatibility and the Z joint is replaced by a custom design.

The microcontroller firmware controlling this machine is completely Open Source and freely available under libre license (GPL). The software system to control the machine via standard G-code is LinuxCNC, which is available for free, too.

There are 7 microcontrollers running self made software to control the mill:

• Stepper motor drivers (One for each of X/Y/Z). Firmware, Schematics
• Peripheral signal control. Firmware, Schematics
• Limit and reference switch debounce and control. Firmware
• Touch probe control. Firmware, Schematics, Mechanics
• Pneumatic pressure control. Firmware, Host software, Schematics

A part of the custom Z joint's moving carriage with the aligned surface manually scraped into shape:

Some aluminum pieces produced on the machine:

Copyright (C) Michael Büsch
Licensed under the terms of the GNU General Public License version 2 . See the sourcecode for details.