10 Tips to Better CNC Turning

10 Tips to Better CNC Turning

No shop wants to see their part ruined and scrapped at the end of CNC turning. And although having a combination of proper technique and the right tools to keep jobs in spec and on time, there are other variables that should be considered before arriving at the finishing stage. Here are some things you can do that will help you get the best surface finish:

10 Tips to Better CNC Turning

Increase Your Speed
This really applies most when using carbide tools. When you increase the surface feet per minute speed (SFM), you will ensure that the material is in contact with the tool tip for a shorter amount of time and will also reduce edge buildup on the tool, which causes poor surface finishes.

Reduce Your Feed Rate
Reducing the feed rate helps to improve surface finish. This will also help to reduce flank wear and prolong the insert’s longevity. In addition, doubling the nose radius will help to improve surface finish. For roughing applications, it’s best to use a tool capable of a high feed rate to remove material quickly. For finishing, it’s best to have a lower feed rate and shallower cut.

Increase the Top Rake Angle
Positive rake angles will lead to a finer surface finish, requiring lower cutting forces. Using a 45° cutter will act downward, possibly making the part flex. As a result, this will cause the back half of the cutter to recut the machined part and create a poor surface finish. Using a 90° cutter will create cutting forces parallel to the part and will not flex it. This will produce a smoother surface finish.

Use a Chip Breaker
A poor surface finish can also be caused by improper chip breaking, downtime to remove chips and higher temperatures at the tool’s cutting edge. A chip breaker can produce smaller chips that are cleared from the cutting area quickly. And because there is no longer a need to clear chips by hand, safety is improved.
If the chip breaker can break the chips into adequate lengths, then vibration will be minimized; the chips will not wrap around the workpiece and tools will not be damaged. Chip breakers also reduce cutting resistance, which can avoid chipping or breaking the cutting edge. A lower cutting resistance can decrease heat and delay tool wear.

Use a Large Nose Radius
The idea is to use a larger nose radius and decrease the feed rate to get a smoother, finer surface finish. This is because the nose radius and depth of cut affects the shape and direction of chips. Therefore, it’s best to use the largest radius possible to achieve the best surface finish and avoid creating chatter (machine vibration). But, on the other hand, a larger nose radius will increase demands on the tool, causing vibration and poor chip breaking, whereas a smaller nose radius produces thinner chips that are easier to clear away from the workpiece, but this will also limit the feed rate.
Here’s a tip: Select a minimum depth of cut two thirds of the nose radius and a maximum of one third of the cutting edge length. For finishing, select cutting depths of less than one third of the nose radius.

Use an Insert with a Wiper
To ensure a good surface finish, use a special wiper insert that has a modified nose radius with larger corners to wipe the surface smooth. This will allow you to cut at a faster feed rate.

Use the Right Technique
Creating a chip that is thick-to-thin is what you want. Your technique plays a vital role in getting smooth surface finishes. Choose a cutter that is smaller than the nose radius so you can program it for a smooth transition from line-to-line.
When you run your final cuts, don’t just limit yourself to checking your workpiece; you should also read your chips. The characteristics of your chips will indicate what machining set up or tooling adjustments are necessary.

Use Different Tools for Roughing and Finishing
Some may say that the same inserts can be used for both roughing and finishing. But it’s best to use separate inserts, one for roughing and one for finishing. For roughing, you can use a course-pitch cutter with a large nose radius, and a large rake angle with a rapid feed rate. For finishing, you can use a fine-pitch finishing tool with the proper lead angle and a wiper flat, which will give you a better surface finish.

Clear the Chips
There is a debate whether to use coolant in milling applications. But it all depends on the type of work you’re doing, such as deep cavity milling, the type of material and which insert you are using. Using coolant, in some cases, should be avoided. It may cause thermal cracking and shorten tool life and could affect the surface finish negatively. But with aluminum, low-carbon steel or nickel-based alloys, using coolant will prevent the tool from sticking to the workpiece.

Check Your Toolholding and Workholding

It’s a good idea to check the condition of your toolholder. An old, worn-out toolholder may cause the insert to move. This will cause chatter and will negatively affect the surface finish of your part. You also want a rigid workholding that is stable, especially with a higher metal removal rate.

- www.bestcnc.com



[ Video ] CNC Programming (2) [Apps] F# Programming Tutorial (1) 100 ebooks for engineers (2) 2048 GAME (1) AC Circuits (1) AC Circuits Tutorial (1) AC Circuits Tutorials (2) Accounting Basics (1) Activities Manual to accompany Programmable Logic Controllers (1) Adeept Ultimate Starter Kit for Arduino (1) Adobe Photoshop CC (1) Advanced Business Application Programming (1) Advanced Excel Charts Tutorial (1) Alarm (1) Amazon App store (165) amazon ebook (86) Amazon Web Services (1) Amazon Web Services Tutorials (1) Amplifiers (1) Amplifiers tutorial (3) and Design (2) android game (17) Animal Connect (1) Apache Flume Tutorial (1) Apache Kafka Tutorial (1) Apache Pig Tutorial (1) Apache Solr Tutorial (1) Apache Storm Tutorial (1) Apex Programming (2) App Android (157) Apple Books (3) Applications (8) Applied Petroleum Reservoir Engineering (1) Apps (197) Apps Android (15) appstore (14) Appstore For Android (1) Arduino (1) Artificial Intelligence (1) Assembly Code Examples (1) Assembly Programming (2) Assembly Programming Tutorial (2) Attenuators Tutorial (2) Attract Wealth Hypnosis PRO (1) AutoCAD For Dummies (1) AutoCAD Tutorial (1) Awk Programming Tutorial (1) AWS (1) BABY LEARN TO ALPHABET (1) Basic Electricity (1) Basic Electronics (1) Basics of Mechanical Engineering (1) Beetle Run (1) Best Apps (52) Best Apps Android 2017 (6) Best games (19) Big Data Analytics with R (1) Binary Numbers (1) Binary Numbers Tutorial (1) Block Puzzle (1) Body Language (1) Boiler House (1) Books list for engineer (1) Boolean Algebra (1) Boolean Algebra Tutorial (6) Boost Your Productivity Quickly (1) Bottle Shooting (1) Build Your Own CNC Machine (Technology in Action) (1) Business Negotiation Skills (2) C Programming (1) C Programming Code Examples (1) C Programming Langguage (1) C Standard Library (2) C# (1) C# programming Examples (1) C# Tutorial (1) C++ Primer (1) C++ Programming (1) C++ Programming Standard Library (1) C++ Programming Tutorial FULL (1) C++ Tutorial (1) Catch Duck (1) Caveman Run (1) Clean Architecture (1) Clojure Programming Tutorial (1) CNC Books (42) CNC Control Setup for Milling and Turning (1) CNC G-Code (9) CNC G-Code tutorial (4) CNC Lathe Machine Programming (1) CNC M-Code Tutorial (2) CNC Machine Tutorial (7) CNC Milling Machine CNC Program Examples (4) CNC programming (60) CNC Programming Basics (7) CNC Programming Examples (40) CNC Programming Handbook (2) CNC Programming Reference (1) CNC Programming using Fanuc Custom Macro B (1) CNC Programming: Basics & Tutorial Textbook (1) CNC Tips (4) COBOL Programming (2) Code Examples (1) Compass (1) Complete Electronics Self-Teaching Guide with Projects (1) Computer Fundamentals (1) Computer programming (1) Computer programming ebooks (1) Control Theory Tutorial (1) CouchDB Tutorial (1) Critical Thinking (1) Crystal Reports (1) Csharp (1) Dart Programming Language (1) Dart Programming Tutorial (1) Delft Pneumatic Bipeds (1) Demon Jump (1) Digital Signal Processing (1) Diodes (1) DISCOVER THE SCIENCE AND TECHNOLOGY OF THE FUTURE (1) Drill CNC (1) Drilling CNC Program (1) ebook (81) ebook kindle amazon (66) ebook Kobo (15) eBooks (187) Elasticsearch Tutorial (1) Electrical Transformers And Rotating Machines (1) Electricity and Magnetism (1) Electromagnetism (1) Electronic Systems (1) Electronic Transformers (1) Electronics DC Circuit (1) Electronics Filters (1) Electronics from the Ground Up (1) Electronics Inductors (1) Electronics Oscillator (1) Electronics Resistors (1) Elenco AM/FM Radio Kit (Combines ICs & Transistors) (1) Elenco Practical Soldering Project Kit (1) Elixir Language (1) Elixir Tutorial (1) Embedded Systems (1) Embedded systems C++ programming Tutorial (3) Embedded Systems Tutorial (1) Erlang Programming (1) Erlang Programming Tutorial (1) Euphoria Programming Language (1) Excel Formulas and Functions (1) Excel Functions & Formulas (1) Excel VBA (1) F# Programming (1) Facebook Advertising For Dummies (1) Facebook Marketing (1) Final Mission Game (1) Flag Game (1) Fortran Programming Tutorial (1) Funny jokes (1) Fuzzy Logic Tutorial (1) G-Code and M-Code (1) G-Code Reference (1) G-Code Tutorials (1) Games (18) Getting Started with 3D Printing (1) Go Programming Language (1) GOLD MINER+ (1) Good book about President Trump * Donald Trump Books * (1) Groovy Tutorial (1) Guide To 3D Printing (2) Guide To Accounting Basics (1) Guide to Amazon Marketplace (1) Guide To Anger Management (1) Guide To Arduino (2) Guide To Artificial Intelligence (1) Guide To Artificial Neural Networks (1) Guide To Assertiveness (1) Guide To AWS (2) Guide To Basic Electronics (1) Guide To Bitcoin (1) Guide To Business Negotiation Skills (1) Guide To Business Writing Skills (1) Guide To CNC Programming (2) Guide To Critical Thinking (1) Guide To Digital Circuits (1) Guide To Digital Electronics (1) Guide To Food and Beverages Services (1) Guide to Java Persistence API (1) Guide To Java XML (1) Guide To Java.io package (1) Guide To jMeter (1) Guide To JPA (1) Guide To JSoup (1) Guide To Make money online (1) Guide To MS Project (1) Guide To Neo4j (1) Guide To Photoshop (1) Guide to Pinterest Marketing (1) Guide To PyQt (1) Guide To Python (3) Guide To Rust Programming (2) Guide To SAP BODS (1) Guide To SAP BW on HANA (1) Guide to Snapchat (1) Guide To Solidworks (2) Guide To Spring Web Services (1) Guide To Struts 2 (1) Guide To SWING (1) Guide To T-SQL (1) Guide To Tcl- Tk (1) Guide To TestNG (1) Guide To Wireless Communication (1) Guide To WordPress (1) Guide To Xamarin (1) Guide To XPath (1) Guide To XSLT (1) Handbook of Natural Gas Transmission and Processing (1) Harmony - Hypnosis Meditation (1) Haskell Programming (1) Hibernate Tutorial (1) Hostinger Tutorials (1) How to Learn Microsoft Access VBA Programming Quickly (1) How to learn Microsoft Office Powerpoint Quickly! (2) How To R Programming (2) How to Use Snapchat (1) ibooks (3) Inter Process Communication (IPC) (1) Internet of Things Tutorial (1) Introducing Arduino (1) Introducing AWK (1) Introducing Boiler House (1) Introducing Clojure (2) Introducing Hibernate (1) Introducing Neo4j (1) Introducing OBIEE (1) Introducing RC Networks (1) Introducing SAP MM (1) Introducing SAP Payroll (1) Introducing Transistors (1) Introducing XPath (1) Introducing XSLT (1) Introduction to Cgi/Perl (1) Java 8 (1) JavaFX tutorial (2) JCL Tutorial (1) Job Control Language (1) Joyo ZOMBIE 20 Watt Mini Tube Head in new banTamp Series New and Nice! (1) JSP Tutorial (1) Jump and Fly (1) Jumping Penguin (1) KDB (1) KDB+ Tutorial (1) Kill Zombies Game (1) Kindle Amazon (3) Kindle Books (3) kindle ebook (19) kit (3) Lathe CNC (1) Learn C++ Standard Library (1) Learn Apache Spark (1) Learn Apache Tajo (1) Learn Apex Programming (1) Learn Avro (1) Learn Basics of Computers (1) Learn Big Data (1) Learn C Programming (1) Learn Cassandra (1) Learn COBOL (1) Learn Computer Programming (1) Learn Crystal Reports (1) Learn D Programming (1) Learn Data Mining (1) Learn Data Structure and Algorithms (1) Learn Database Management System (1) Learn Digital Image Processing (1) Learn Diodes (1) Learn Electronics (1) Learn Electronics and Digital Electronics by GoLearningBus (1) Learn Electronics with Arduino (1) Learn Euphoria (1) Learn Food Production Operations (1) Learn Genetic Algorithms (1) Learn Go Programming (1) Learn Haskell Programming (1) Learn How to Make Money with a Success Mindset (1) Learn Interpersonal skills (1) Learn Java.langPackage (1) Learn Java.util package (1) Learn LISP (1) Learn Objective-C on the Mac (1) Learn RC Networks (1) Learn SAP ABAP (1) Learn SAP Payroll (1) Learn Scala Programming (1) Learn Scripts (1) Learn Social Intelligence (1) Learn Social Media Marketing (1) Learn Swift (1) Learn VB.net By Examples (1) Learn Windows 10 (1) Learning Perl (1) Lignocellulose Biorefinery Engineering: Principles and Applications (1) LISP Programming Language (1) Logic Gates (1) Logic tutorials (1) Logo Programming (1) Logo programming language (1) LOLCODE Programming Language (1) Make Money Online Tutorial (1) Make: Electronics: Learning Through Discovery (1) Mastering Node.js (1) MathTeX: LaTeX Mathematics (1) MATLAB for Beginners (1) Microsoft Project Standard 2016 (1) MILLIONAIRE FREE (1) Miscellaneous Circuits (1) MongoDB (1) MongoDB Tutorial (1) Move The Fruit (1) MySQL (1) MySQL Tutorial (2) NAO robot course (1) Network Programming with Python (1) Node.js (1) NumPy Tutorial (1) OAuth 2.0 (1) OAuth 2.0 Tutorial (1) OBIEE Tutorial (1) Objective-C Programming Language (1) Operational Amplifiers (1) Parrot Programming (1) Parrot Programming Tutorial (1) PHP 7 Tutorial (1) Pipe Drafting and Design (1) PL/SQL Tutorial (1) Power Electronics (1) Power Electronics: Converters (2) Power Supplies (1) Programming Groovy (1) Programming of CNC Machines (2) Programming Rust: Fast (1) Programming with MATLAB for Beginners (1) Python (2) Python 3 Tutorial (2) Python Pandas Tutorial (1) Python Programming For Beginners (1) Python Tutorial (2) R Programming (2) R Programming Examples (1) Reasoning Web. Semantic Interoperability on the Web (1) Reference books ICT (1) Report Studio Developer (1) Rexx Tutorial (1) Robot Programming (1) robotics tutorials (1) RoutCad de Luxe CAD-CAM Software CNC Mill (1) Rust Programming (1) Rust Programming Tutorial (1) Safe Systems Development (1) Safety Valve (1) Salesforce Tutorial (1) SAP Advanced Planning and Optimization (1) SAP Basis Tutorial (1) SAP BO Analysis Edition For OLAP (1) SAP Business Explorer (1) SAP Business Planning and Consolidation (1) SAP Business Workflow (1) SAP BW on HANA (1) SAP MM - Tutorial (1) SAP_GRC Tutorial (1) Schaum's Outline of Basic Circuit Analysis (1) Script Programming Tutorials (1) Scripts (1) Sematic web (1) Sequential Logic (1) Sign Language ASL | BSL (1) Sinusoidal Oscillators and Waveform Generators (1) SnapChat (1) Snapchat Tutorials (1) Socket.IO Tutorial (1) Software (3) Solidworks tutorials (2) SOLISWORKS (2) SOLISWORKS ebooks (1) SOLISWORKS Tutorials (2) Spring Batch Tutorial (1) Spring Framework (1) Spring MVC Tutorial (1) Spring Tutorial (1) SQL Fundamentals Certification tutorial (1) STATUS AND QUOTES (1) Steam Engineering Principles and Heat Transfer (1) Steam trapping and air venting (1) TestNG Tutorial (1) The Best Apps for Tutorials (1) The best Kindle (1) The CNC Cookbook (1) The complete guide to Arduino for beginners (1) The Essential Guide to Digital Signal Processing (1) Third Edition (1) Tips (33) Tips and Tricks (3) Tips for CNC Users (33) Top 10 best sellers on the Amazon Kindle (1) Turtle Run and Jumper (1) Tutorials (312) Understanding Hot Water Heating Systems (1) VB.Net Programming Tutorial (1) VBA Tutorial (1) Video (1) Waveform Generators (1) Ways To Make Money - Work At Home (1) WordPress Tutorial (1) Write DAX (1) Xamarin Tutorial (1) XML (1) XML Technologies (1) XML Technologies Tutorial (1) YouTube Marketing (1)