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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 plastics and PVC

When cutting plastics such as styrene and acrylic you must consider the effects of having a bit or a laser penetrating the material and marring surfaces. Cutting plastics requires some aspects that don’t apply to metals or wood. Many plastics including acrylic and plexiglass are brittle and will crack under stress. Therefore, clamping the stock material so that it cannot move will be important especially as loads are applied during cutting. Also important is the use of lower spindle speeds. High RPMs will heat up the surrounding material and cause the plastic to deform, which can add stress to it and ultimately result in cracks and breaks when least expected.

Cutting thicker stock material is much easier than thin. Thicker stock will hold its shape better and is less likely to get damaged by the bit. When I am cutting thin plastics (2 mm thick or less), I usually resort to the laser. By the same token, cutting softer plastics presents similar issues...

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