CNC 3020 Pro Max

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Warning: This page is still work in progress, please contact Yichen Zhang (Spacezhang) or Phier on Slack if more information are needed.
Attention.png Warning: Beware of the dangers of CNC machines! Use at your own risk and only if you know what exactly you are doing! Attention.png To use this machine the "CNC beginner training" workshop is mandatory!
CNC 3020 Pro Max

Release status: experimental [box doku]

Description Milling/Engraving Machine
Author(s)  Yichen Zhang (Spacezhang)

General Introduction

A small but full-featured cnc running GRBL donated to the lab for use, brought to you and maintained by Yichen.

What is the CNC 3020 Pro Max V2?

The CNC 3020 Pro Max V2 is a generic engraving machine. This machine can be used to cut anything from wood to aluminium and is very good for getting started and learn how to use a CNC machine and how It works.

Course Material


Software Setup & Introduction


Working windows software bundle for controlling the machine and for PCB Milling:

This is Preferred if you are using Windows as we can guarantee it works. Windows Driver also Included

CAM Options

Name Details Link
Carbide Create V6
  • Software for 2D Routing
  • Free, Tested, Recommended, WIN/MAC
  • Use version V6 as later version requires subscription)
Openbuilds opencam
  • Free, Tested, Web-Based or Local, WIN/MAC/LINUX
Fusion 360 CAM
  • For proper 3D Routing
  • Free*, Tested, Recommended
  • More advanced and requires more time to learn, but very powerful and is a requirement for the big CNC

Tutorial coming soon, till then please search on youtube or ask for instructions on slack

Some Gcode Sender options

Control via your computer

To control the machine like positioning and execution of the instructions, it is required to run specific software and connect to the machine via USB - which provides a serial connection. It might be required to manually install a driver in order to use the serial connection.

Search for a driver called CH340 or CH341 provided by manufacturer WCH. The instructions provided by Sparkfun might be helpful [1]

For Windows users, the GRBL Candle software is a good choice for controlling and sending GCode to the machines. It is technically also usable on linux and mac, but it is untested.

For Mac's which are newer, GRBL Candel might not work due to some newer mac features. Instead, the universalgcodesender or the openbuilds Gcode Sender could be used.

Name Details Link
universal gcode sender Free, Open Source, WIN/MAC/LINUX (Tested with Mac)
bCNC Free, Open Source, WIN/MAC/LINUX
Openbuilds Control Free, Open Source, WIN/MAC/LINUX
alternative option

There is also a offline Gcode Sender avaliable for use where Gcode can be loaded onto the SD Card and send to the machine.

Instructions for different materials

Wood Engraving / Milling

[Detail comming soon]

PCB Engraving

[Detail comming soon]

Acrylic Engraving / Milling

[Detail comming soon]

Test Gcode

[Detail comming soon]


[Detail comming soon]

Material settings

  • For now, please use the rough estimate till we figure the value out for each bit!
  • 3.175mm Bits:
    • MDF & Softwood: 3.175mm single flute no nore then 400mm/min, 2mm single flute no more then 300 mm/min, double flute double the Feedrate
    • Acrylic: 3.175mm single flute no nore then 300mm/min, 2mm single flute no more then 200 mm/min, double flute double the Feedrate
    • Aluminium: 2mm double flute 20mm / min, plundge rate 20mm / min(More testing need to be done)

Spindle speed: 10000 (Not actually at this speed, but for controller)
Plundge rate: 200mm / min to 400 mm / min Pass depth: half the bit cutting size

  • Engraving Acrylic: Use 25deg Vbit spiral cutter,
    • Feedrate: 300/min, Plundge rate: 200mm/min, cutting depth: 0.3mm
Acceptable work piece materials

Engrave/ Cut

  • MDF / HDF
  • Softwood, Hardwood, Plywood
  • Acrylic
  • PCB
  • Aluminium, Brass & More

Technical Documentations

The Machine:

Spindle currently in use:

Official Resource Page from Saintsmart:


Mechanical Specifications
  • Type: Milling / Engraving machine
  • Machine dimensions: 484 x 394 x 388mm (19.04” x 15.49” x 15.28”)
  • Working area: 300 x 205 x 78 mm (11.81″ x 8.07″ x 3.07″)
  • Max Speed: 2000mm / min
  • Frame: Extruded Aluminum, All Metal
  • Motion: NEMA 17, 47mm Stepper motors
  • Stepper Driver: TB67S109
  • Power Supply: 48V 8.3A
  • Running / Reposition Accuracy: <= +- 0.1mm
  • Materials: Woods, Plastics, PVCs, soft aluminum (6061), Nylon, Acrylic, PCBs
  • Motor: 300W 52MM DC 12-48V CNC Spindel Air cooled 12000U/min
  • Cooling Fan: Internal
  • Overall Size: ‎20,5 x 6,8 x 6,8 cm; 867 Gramm
  • Collets: ER 11
  • Actual measured Spindle Speed (Without Load): 13500 U/min
Speedcurve between set speed (0 to 10000 in Candle) and actual measured speed
Routing Bits
  • Currently mostly 3.175 mm (1/8 Inch) Bits Available
  • V Bits 20 / 30 / 40 / 60 degree
  • Multifunctional cutting bits 0.8 – 3.175 mm
  • Single flute upward cutting bits 3.175mm, 2mm
  • 3.175mm Ball end double flute bits
  • More are comming
Controll Board
  • Genmitsu custome control board
  • Running GRBL 1.1f ARM32
  • Interface Compatibility: Windows, Mac OS, Linux
  • Height Probe, Hand Wheel & Air control connection
  • Up to 4A Laser connection avaliable

Current GRBL Settings

$0=10 (step pulse,usec)
$1=25 (step idle delay,msec)
$2=0 (stepport invert mask)
$3=2 (dirport invert mask)
$4=0 (stepenable invert,bool)
$5=1 (lims pin invert,bool)
$6=1 (probe pin invert,bool)
$10=1 (status report mask)
$11=0.010 (junction deviation)
$12=0.002 (arc tolerance,mm)
$13=0 (report inches,bool)
$20=0 (soft limits,bool)
$21=1 (hard limits,bool)
$22=1 (home cycle,bool)
$23=3 (homing dir invert mask)
$24=100.000 (homing feed,mm/min)
$25=500.000 (homing seek,mm/min)
$26=250 (homing debounce,msec)
$27=2.000 (homing pull-off,mm)
$30=10000 (maximum spindle speed,rpm)
$31=0 (minimum spindle speed,rpm)
$32=0 (laser mode enable,bool)
$100=800.000 (x axis pulse:step/mm)
$101=800.000 (y axis pulse:step/mm)
$102=800.000 (z axis pulse:step/mm)
$110=2000.000 (x axis max rata:mm/min)
$111=2000.000 (y axis max rata:mm/min)
$112=2000.000 (z axis max rata:mm/min)
$120=50.000 (x axis acceleration:mm/s^2)
$121=50.000 (y axis acceleration:mm/s^2)
$122=50.000 (z axis acceleration:mm/s^2)
$130=300.000 (x aixs max travel:mm)
$131=200.000 (y aixs max travel:mm)
$132=80.000 (z aixs max travel:mm)

Change Log

Note: Aiming for Middle 2024 to finish the documentation. Till that time, if you have any questions in regards of this machine, please contact @spacezhang on slack.

  • 16.11.2023: Machine has been assembles and brought to the lab.
  • 11.12.2023: Wiki Page has been created
  • 27.12.2023: New Spindle Arrived, runout improved from 0.11 to 0.03, Spindle Speed manually measured
  • 25.01.2024: New Eurobox container has arrived and the machine is now on the bottom shelve in the workshop! (As discussed in Plenum)

<\br> Also: We have more new bits for use!

Feedback and suggestions

If you have any feedback, request or suggestions in regard to this project and wiki page, please feel free to contach me or simply edit this section of wiki.