CNC Mill Introduction

This is the content required for an introduction to our CNC Mill - reading this does NOT replace the mandatory session with a tutor! It will make it a lot quicker though ;-)

If you need this introduction, please reach out to the following tutors: ADD

Before you get this introduction, please make sure you already have the Handheld Router Introduction, this will help you understand the machine much better and is required before using it. To gain first experience in CNC, it is recommended that you start with the Handheld Router Introduction and gain first experience on the Workbee CNC.

Safety

Personal protection:

Dangers	Precautions
sharp, fast spinning bits (end mills or - rarely - certain router bits)	stay clear of the CNC Mill when in operation unplug the Spindle when changing a bit or touching the chuck for any other reason insert your mill as far as you can afford for maximum strength
strong forces acting on the workpiece that might make it move	secure your workpiece properly - see CNC router workholding
the machine has no live sensors and will execute its code regardless of what gets into its way heat generated during improper use can even set the machine on fire	home the machine (set its absolute maximum positions) before executing any movements reference the machine to the workpiece (relative maximum/starting positions) before starting the router monitor the CNC router closely when in operation keep an eye on the cables that come from above - are they securely out of the machine's paths? Let end mills cool down before handling (risk of burning yourself)
hitting "pause" or "stop" in a control program will still let at least the current line be executed	push the emergency shutdown button if anything goes wrong
lots of dust that could harm your health or settle down on machine parts, possibly hindering movements	When milling wood or plastics, use the dust shoe and connect a shop vac. When milling metal, NO NOT extract the metal chips with a vacuum. Always position the wooden or acrylic U-shaped box over the work area to reduce the risk of flying chips towards the user and to protect the rails.
When milling metal, hot chips can fly towards user	Always place the U-shaped guardrail over the table. Even with the rail, chips can fly towards you, stay clear and wear eye protection.

Suggested Reading

Besides these safety notes, you should read about the different end mills (and router bits, if you want to try those) to know what you're doing! Different materials usually require different mills, and the feedrate depends on the mill as well as the type of material.

• our list of milling experiences - please also share what you find out!
• top milling tools for new CNC machinists
• G-Code fundamentals

Recommended Watching

• CAM, virtual setup: how to prepare your model and place it in a virtual workpiece in Fusion 360 (DE)

Demonstration

The tutor will show you these steps in detail:

1. Machine Explanation
   • Explain the main components of the machine
   • Explain the emergency switch
2. Machine Set-up
   • selecting the right bit
   • inserting a bit
   • turning the machine on and off
   • homing the machine (setting absolute "0" positions)
3. Fusion360 Set-up
   • Draw a simple pocket
   • Set-up the machine in Fusion
   • Set-up a toolpath
   • Export the tool path to USB
4. Setting-up the workpiece
   • Securing your workpiece on the bench. How to protect the t-nut table
   • Setting the relative "0" position on your workpiece.
   • connecting and turning on dust extraction (if wood workpiece)

You should then be able to do a small practice cut together with the tutor.== Waiting List == This introduction takes longer than many others and usually can't be done spontaneously during regular opening times. If you would like to receive it, please add yourself to >> this list << and we will find a good time once a few members are on it!