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A Tinkerer's Guide to CNC Basics

A Tinkerer's Guide to CNC Basics

By : Najia
4.7 (10)
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A Tinkerer's Guide to CNC Basics

A Tinkerer's Guide to CNC Basics

4.7 (10)
By: 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)
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11
Chapter 11: Building a More Capable CNC Machine

Cutting softwoods such as balsa and light plywood

For our purposes, I am using 3 mm plywood to cut out my bulkhead because most of the balsa wood in my shop is smaller planks for park-flyer-type (i.e., smaller scale) airplanes. I use the same plywood for model rocket fins, and while light and easy to mill and machine, it is very durable.

Both balsa and plywood are going to chip on the “bottom” surface (the surface facing the wasteboard) if we are not careful with what endmill we use. To prevent the “tearing out” that would happen with plywood, I recommend a flat-head downcut endmill. I am using a single-flute flat-nosed endmill with a 1/8” shank. These are commonly available from various vendors, and you should take into account that you will likely break a few as a matter of course. I like to keep my feed rate slow, at or below 1000 mm/s for thicker plywood and 2000 mm/s or less for thicker material. For the spindle, keep it below 24,000 RPM.

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