A non-functional Dyna Myte 2400 milling machine was donated to the Robot Garden makerspace in Livermore, California. The Dyna Myte 2400 was built in the 1980’s  and its retrofit presented some unique challenges. Robot Garden was  unable to get it going in a previous retrofit attempt. The machine sat in storage until it was revived using a Buildbotics CNC controller.

Robot Garden was delighted when Buildbotics offered to revive the Dyna with their new Open-Source CNC controller. The Dyna retrofit demonstrates some of the power and  flexibility of the Buildbotics controller. For instance, the stepper  motors on the Dyna only provide 27 ounce-inches of torque. The original  machine compensated for this low torque by providing a 10 to 1 gear  ratio between the motor and the axis ball screws. Given the 2.5 mm pitch  ball screws, the machine head would only move by 0.25 mm for each  complete revolution of the motor. In order to meet the published jogging  speed of the machine (30 IPM), the stepper motors had to turn at 3000  RPM. The controller had to provide over 5000 steps per second to  minimally meet that goal. This was a breeze for the Buildbotics  controller which is capable of over 200k steps/sec. Performance was  further improved with 1/32 micro-stepping. The resulting 160k steps/sec  yielded smooth, reliable operation.

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Buildbotics  also supplies a cable set that made interconnecting to the existing  motor and power supply a snap. An enclosed I/O breakout box was used to  connect to the existing spindle controller and the limit switches.  Finally, a couple of shelf brackets from the local hardware store  provided a nice mount for the controller.

This  previously unusable Dyna Myte 2400 is now a solid CNC mill with modern  features and should provide great service for years to come.

The  Buildbotics controller generates its own steps and contains a web  server, so you don’t need to dedicate a PC; and you can configure and  control it across your local Ethernet using a web browser. Eliminating  the PC cuts costs and saves space.

The  Buildbotics CNC controller can operate on voltages from 12 to 36 DC and  supply up to 6 amps of current on each motor, but no more than 25A  total. Smooth S-curve acceleration and deceleration allows machines to  operate without sudden changes in acceleration which cause jerk. The  ability to provide local jogging control with an inexpensive USB gamepad  and to monitor cutting remotely through a USB web camera is also really  handy.

The hardware and software for the controller are completely Open-Source and work directly with CAMotics. CAMotics is an Open-Source simulator, GCode viewer and CAM software. After  simulating designs, CAMotics allows its users to connect directly to the  Buildbotics CNC Controller and upload GCode programs. CAMotics will  follow the cutting operation in real time. This lets you easily see  where the machine is in the cutting process an how long it should take  to complete.

This  range of performance and features make the Buildbotics controller ideal  for controlling a variety of CNC machines. Buildbotics has demonstrated  control of several different CNC machines including the OX, the Taig Mini-Mill, a 6040 CNC, an engraving machine, a LASER cutter, and a sizable DIY CNC.

You can get your own Buildbotics CNC controller and support this great Open-Source project through the Buildbotics store. For detailed instructions on how to perform this retrofit check out our hackaday.io project.