Book Image

A Tinkerer's Guide to CNC Basics

By : Samer Najia
5 (1)
Book Image

A Tinkerer's Guide to CNC Basics

5 (1)
By: Samer Najia

Overview of this book

Until recently, Computer Numerical Control (CNC) machines belonged to the realm of heavy industry, but as technology becomes cheaper and smaller, these machines now can be used in home workshops. It’s not easy to get started, though, but thanks to this guide, you’ll be ready to take on a variety of projects in no time. A Tinkerer’s Guide to CNC Basics contains everything you need to get set up at home with computer-controlled machining and fabrication. Sparing you the theory, this project-laden guide helps you learn by doing. Once you’ve got to grips with the principles of CNC and installed the 3018 Pro CNC machine, you’ll gradually move from simple projects such as basic engraving to more complex milling and machining techniques. You’ll even learn how to upgrade your machine to accomplish more sophisticated designs. The plethora of projects in this book will keep you busy and give you the practice you need to get started with your computerized workshop. By the end of the book, your computerized home workshop will be one step closer to realization, and your machining skills will be taken to the next level.
Table of Contents (15 chapters)
11
Chapter 11: Building a More Capable CNC Machine

Different settings for different operations

We have already touched on some of the considerations around settings related to not just what you are cutting, but also how. For a laser, multiple passes where the beam is likely to diffuse inside acrylic may mean wider cut lines and multiple passes (acrylic tends to re-melt if the cut line is thin, requiring higher power beams and multiple passes). When using an end mill most of your settings will be in the G-code generator program. However, there are some basics I have found that serve me well.

If I am engraving wood, I keep the depth to 1-2 mm at most. If I need shading and changes in texture, I will switch to a laser. If I am engraving metal with an end mill I never get deeper than 1 mm and prefer to stay in the realm of 0.2-0.5 mm.

I have broken enough bits trying to find a baseline feed rate for every material I typically work with. This feed rate is calculated based on the bit, the RPM, the material type, and so on. You may...