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


Join 100,000+ 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

G-Wizard facemill Feeds & Speeds


I have a 3″ facemill with 4 carbide inserts.  Since the holder itself is quite large, I’m just setting the stickout to .0001″ since deflection seems irrelevant.  The speeds and feeds output by G-Wizard seem very low, esp. when just specifying a very small DOC to level stock.

I’m also wondering what significance the lead angle plays in the calculation.

  • You must to post comments
Best Answer

It’s fine to ignore the stickout, even the default 1″ shouldn’t show much deflection on a 3″ facemill.

G-Wizard is conservative on indexable tooling because it has to choose the performance for the “average” insert.  The problem is that with so many inserts out there, average is very conservative.  You’ll want to enter the manufacturer’s recommended surface speed and chipload if you have that available for your particular insert:

Lead angle matters quite a lot.  The 90 degree default gives a square shoulder on the cut, but a 45 or 60 degree lead angle insert gives a nicer finish and can often be fed faster.  If you’re facing the whole surface and there’ll be no shoulders, it’s almost always preferable to have some lead angle less than 90 degrees.  This is all factored into the feeds and speeds calculation.

Here’s a post about the differences when face milling:

  • 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.
Show us your humanity*


Do you want to be a better CNC'er in 37 Seconds?

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

It's that easy. You can install and get results in a matter of minutes.


Start Now, It's Free!



  GW Calculator

  GW Editor



  Deals and Steals

CNC Blog








     Feeds and Speeds

     G-Code Tutorial

     CNC Machining & Manufacturing

     DIY CNC Cookbook

     CNC Dictionary

CNC Projects


     Machinist's Search


     Online Groups


     Reference Data


     CNC Dictionary


     Tool Brands


     Hall of Fame

     Organization: Soon!





     Our History

     Privacy Policy

All material © 2016, CNCCookbook, Inc.