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November 25, 2021, 11:04 am by Eldar Gerfanov

General Speeds and Feeds Formulas

December 24, 2010, 2:10 pm by Eldar Gerfanov

What are Machining Speeds and Feeds

One of the basic tasks a machinists must learn to perform is calculation of speeds and feeds required for milling, drilling and turning.

It starts from knowing your workpiece materiel and tooling you are going to use in order to cut it.
The combination of these two factors determines your initial Cutting Speed and Chip Load that you can put into the speed and feed formulas to calculate the cutting tool RPM and feed rate.

Cutting Speed is the speed at which the tip of the tool travels through material. It is commonly expressed in Surface Feet per Minute (SFM) or Surface Meters per Minute (SMM).

Chip Load is the advancement of each tooth per revolution of the tool.

In other words Chip Load is the thickness of the material that each tooth removes per each revolution.

So how do you find the Cutting Speed and Chip Load for your tool?

Tool manufacturers often post Cutting Speeds and Feeds for their tools for various materials and cutting conditions.

Most experienced machinists simply remember cutting speeds and chip loads for materials they machine most often.

Here are commonly recommended cutting speeds and chip loads for carbide tools for a couple of materials:

• Aluminum: 300SFM, 0.7% of the diameter (for example fz = 0.5"dia x 0.007 = 0.0035in/tooth)

• Annealed Tool steel: 150SFM, 0.4% of the diameter (for example fz = 0.5" x 0.004 = 0.002in/tooth)

When you have manufacturers data simply find your tool in the catalogue and cross-reference the cutting speed and chip load against the tool diameter:

Since cutting speeds can be in either Imperial (SFM) or Metric (SMM or m/min) units, you have to use two formulas to calculate the RPM.

Imperial Speed and Feed Calculation

Code

 RPM= 12 x SFM = Please enter Speed and Diameter 3.14 x in

Feed Rate = RPM x x in = Please enter RPM, number of teeth and chip load (in/min)

Metric Speed and Feed Calculation

Code

 RPM= 1000 x m/min = Please enter Speed and Diameter 3.14 x mm

Feed Rate = RPM x x mm = Please enter RPM, number of teeth and chip load (mm/min)

Want something better?

More about formulas needed to calculate turning, drilling, and of course milling speeds and feeds

Here are a few basic formulas with term explanations to get you going:

Calculating Spindle Speed (RPM) Using Imperial Cutting Speed:

Code

 RPM= 12 x SFM 3.14 x Diameter

Simplified imperial formula:

 RPM= 3.8 x SFM Diameter

Calculating Spindle Speed (RPM) using Metric Cutting Speed:

Code

 RPM= 1000 x SMM 3.14 x Diameter

Simplified metric formula:

 RPM= 318 x SMM Diameter

Calculating Feed Rate :

Feed_Rate=RPM x N(teeth) x CL(chip load)

Comparing HSMAdvisor vs. FSWizard:Mobile and other products

October 31, 2013, 11:58 am by Eldar Gerfanov

Comparing HSMAdvisor vs. FSWizard:Mobile and other products

Update: It has been a while since i updated this table. So i decided to bump it.

I am often asked what are the differences between HSMAdvisor and FSWizard CNC Machinist's Speed and Feed Calculators.

To address it in a form that will be easy to understand, here is a little neat table. I also included competing software into the last column, so people can compare and make better decisions.

Legend:

 Fully Supported Feature Not Supported Feature Partially Supported Feature

January 3, 2015, 5:27 pm by Eldar Gerfanov

Due to popular demand I am adding a new item into our web store.

From this point on you can purchase a Right to Access additional databases to your free FSWizard LITE app, that turn it into a FSWizard:PRO version.

October 11, 2014, 6:46 pm by Eldar Gerfanov

Please check out our HSMAdvisor Store web page for details on currently available packages.

Here is how after purchasing Bundled Package you can enable FSWizard PRO features on your Android or Apple device.

November 8, 2022, 9:50 pm by Eldar Gerfanov

A new version of HSMAdvisor has just been released!

This minor update adds the Portuguese language and fixes the Language upload feature.
Thanks to TribeJoint - www.instagram.com/tribejoint/ for providing the translation!

Also, minor tweaks were made to improve drill chip load calculations for tiny and very large drills.

In related news. Big work is currently happening with expanding and improving the HSMAdvisor's Material Database.

Cheers!

Dark theme for FSWizard

July 21, 2022, 12:12 pm by Eldar Gerfanov

Please check out the new dark theme in FSWizard web app on app.fswizard.com

The theme can be changed in app settings page.

Any feedback or recommendations are welcome!

Cheers!

June 25, 2022, 12:55 am by Eldar Gerfanov

The HSMAdvisor core was also updated for all Mastercam plugins from 2019 to 2023

Huge thanks for everybody who continues to contribute to this software and refer it to your colleagues!

Cheers!

Adding 4th axis to the desktop CNC

May 9, 2022, 6:40 pm by Eldar Gerfanov

Just finished setting up the 4th axis.

That table is starting to look a little crowded.

FSWizard v2.1.1

April 10, 2022, 8:50 pm by Eldar Gerfanov

FSWizard Machinist Speed And Feed Calculator has a new feature!

Filtering was added to the Cut Cloud tool list, making it easy to find the tools you are looking for:

You can filter by the library name, Tool type, and/or by a plain-text search.

Additionally, the list now checks the version and updates in the background, which means the page now appears almost immediately. No more waiting for 15-20 seconds to download all your tools each time you open it.

Thanks to everybody who made improvement suggestions and feature requests!

As usual, you can find the links to the FSWizard app here: https://fswizard.com/

Cheers!

Sing In