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

Why do I suddenly get 0 rpm in G-Wizard for certain combinations?



I have a Gwizard question…

When I am calculating speed/feeds on smaller drills, very long drills, and sometimes with certain end mills I get either no results (zeros), or I get minimum RPM error. My minimum speed is 100RPM, but I should be far above that speed. If I play with various cut depths I can make the calculator work, sometimes just changing the cut depth by .1″ will make me loose my results.

Any help would be appreciated!



  • You must to post comments
Best Answer

This mostly happens with twist drills.  When G-Wizard finds a cut it thinks is completely untenable, it sets RPM to 0.  There should be a message in the Hint area that suggests why.

It may be possible to drill a hole deeper than G-Wizard will give feeds and speeds for, but you will have to develop a method that is trial and error.

Having a custom deep hole cycle will help you to get there.  Our G-Wizard Editor can create custom deep hole cycles.  For more information, see this page:

  • You must to post comments
Showing 1 result
Your Answer

Please first to submit.


Do you want to be a better CNC'er?

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


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.