Device Overview

We currently have a ooznest Ox CNC.

• The main controller board is a Arduino Uno running Grbl 1.1
• There is also a CNC Shield, I think one of these - https://blog.protoneer.co.nz/arduino-cnc-shield/
• The stepper motors are Nema23’s, I think 2.8A max based on the ooznest site
• I think the stepper drivers are Pololu - Allegro A4988, which are probably limited to around 1A max without cooling

Maximum travel

• X Axis: 563mm (left to right)
• Y Axis: 746mm (front to back)
• Z Axis: 68mm (up to down)

Firmware Overview

Currently the Ox CNC uses an Arduino Uno with Grbl 1.1

• https://github.com/grbl/grbl
• https://github.com/grbl/grbl/wiki/Configuring-Grbl-v0.8#grbls-xval-settings-and-what-they-mean
• The original version of the firmware was 0.9
  
• This has now been updated to version 1.1 which uses a baud of 115200

Power Supplies

There are 2 PSU’s in use

• The first powers the spindle via a black box BLDC driver
• The second powers the stepper drivers / cnc shield

Spindle

The spindle is a 400W one controlled via a potentiometer, driven by a BLDC driver. The plan is to switch this across to pmw at some point.

Rpi

There is a RpiV1 acting as a serial proxy so that we can connect to the OxCNC over the network to it’s serial port.

End Stops

There are inductive end stops for every direction except for travelling downwards.
The downward limit is handled via a software limit which is based on the homing position.

Tool Heads

For the collets we have ER11 collets located in a box next to the CNC. ideally we could do with milling out a wooden plate for holding them, on a pull out shelf etc.

The milling bits are generally 3mm or 6mm.
We also have other smaller bits for pcb milling etc.