Categories

 

G-Wizard Calculator:
Fast, Easy, Reliable Feeds and Speeds

Subscribe

Join 50,000+ CNC'ers!  Get our latest blog posts delivered straight to your email inbox once a week for free. Plus, we’ll give you access to some great CNC reference materials including:

  • Our Big List of over 200 CNC Tips and Techniques
  • Our Free GCode Programming Basics Course
  • And more!

 

GCode is Complicated
G-Wizard Makes it Easy

GWizard question regarding finish versus roughing feeds and speeds

Answered
0
0

I’m curious about the result I get from GWizard, for an 1/4 inch 1 flute carbide flat endmill, DOC 0.25 WOC 0.25 I get range from 16000 rpm and 4.5 IPM for a “fine cut” to a 19000 rpm and 133 IPM for a “rough cut” in hard wood. You just posted an article  11 Feeds and Speeds Considerations for Lightweight CNC Routers  and if I refer to the “sweet spot” diagram, it clearly shows you’re in the green and get a fine surface finish at higher spindle speed and at moderate feed rate. It seems contradicting and the article mention the problems of being to conservative.

I though the idea of using GWizard was to forget all the guess work.

Yves

  • You must to post comments
Best Answer
0
0

Yves, one thing that’s not immediately obvious from the Sweet Spot graphic (but if you think about it, the graphic does reflect this) is that it isn’t the absolute values but rather the ratios of rpm to feedrate that govern whether you’ll get more of a roughing or a finish cut.

Let’s look at your two values from G-Wizard:

Roughing:  19000 rpm and 133 IPM.  So we will have a little under 143 revolutions per inch of feed motion.

Finish:  16000 rpm and 4.5 IPM.  Here we have 3556 revolutions per inch of motion–almost 25x more.

To put it another way, that finish pass is making cuts that are 25x finer than the roughing pass.  Any tool marks will be 25x finer and therefore much less distinct and much closer together.

G-Wizard made it possible not to have to worry about any of that–you just move the Tortoise-Hare slider to reflect whether you’re doing Roughing or Finishing and away you go.

  • You must to post comments
Showing 1 result
Your Answer
Post as a guest by filling out the fields below or if you already have an account.
Name*
E-mail*
Website
Show us your humanity*

 

Do you want to be a better CNC'er?

Get Better Tool Life, Surface Finish, and Material Removal Rates.

 

Start Now, It's Free!

Home

Software

  GW Calculator

  GW Editor

  Gearotic

  Conversational

  Deals and Steals

CNC Blog

  Software

  Techniques

  Beginner

  Cool

  Projects

 

Cookbooks

     Feeds and Speeds

     G-Code Tutorial

     CNC Machining & Manufacturing

     DIY CNC Cookbook

     CNC Dictionary

CNC Projects

Resources

     Machinist's Search

     Videos

     Online Groups

     Individuals

     Reference Data

     Books

     CNC Dictionary

     Suppliers

     Tool Brands

Workshop

     Hall of Fame

     Organization: Soon!

 

About

     Customers

     Partners

     Our History

     Privacy Policy

 
All material © 2016, CNCCookbook, Inc.