Calculating the RPM for your machines

Here's how to calculate the proper RPM of your machines for a given material and diameter. I explain how cutting speeds are represented (in both Surface Feet per Minute and Meters per Minute), talk a bit about the materials and cutting tools, and show examples of the equations.

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[robertoswalt]

Thank you so much for this wonderful explanation. I have been frustrated trying to figure out sliding calculators and the machinery handbook. Now I understand and have written this down on and prominently displayed in my shop.
Your students are fortunate to have you as an instructor.

[engelbob]

Nicely done. It is disappointing to see so many viewers and so few likes. You deserve more recognition for your effort.

[andrewdashgdotcom]

Brilliant introduction to an arcane topic. Very glad to have found your video - gets me started from a point of my ignorance! Thank you so much.

[cristianilie]

I've been watching a lot of videos lately for better learning how to use the lathe and mill and this is my favourite so far! Thx for the info and keep up the good work! All the best from Romania!

[danmccurry]

Thanks for speeds and feeds in a nutshell, I have learned through the years working at various Manufacturing companies, most machinist pic speeds and feeds from tribal knowledge on the machined parts history, memory or trial and error. It's more costly so this technical information will be helpful at any level or skill!
It's great that you noted the suppliers of cutting tools and production expectation speeds verses nonproduction or manual time.
Thanks for posting this helpful Gem!

[seabeckon]

Thanks for the metric calibration of RPMs very helpful.

[sheldonbrooksugarhouse]

Just found this tutorial. Thank you, they are clear concise and very helpful.

[CaptainSwoop]

Excellent presentation. Thanks from Australia

[mikekeele]

Since i was an auto shop major before electronic ignition was on the shelf, i appreciate instruction that is very simple. You do a wonderful job. The highest accolade we could give a teacher in those days was to call him coach. Thank you, "coach."

[AlexTrain]

My high school teacher actually used your videos for a quiz. It certainly worked well.

[johanvantongeren]

Great video! I was about to go and convert these weird imperial measurements to proper metric, but then you saved me a lot of time in the end 😬 thanks!

[NOOne-imvg]

Excellent explanation and use of examples.

[hiiitek]

Just got into a tool and die maker apprentice program at my job of which there’s manual mills and lathes and only one CNC machine and a big problem I had was understanding the speeds and feeds your video helped a lot wrote it all down and posted it in my Toolbox at work for reference 👍

[waltrichardson]

Really like this explanation, I also teach machine shop math and this is much better than what is in the book. The book recommends rpm= fpm x 12 over Pix D but I also prefer the use of sfm x 4 over, much simpler, but I guess I had never taken the time to discover why the use of 4, had just been advised to use that by another machinist. Thanks again.

[trebornirtus]

I’m learning a lot from your channel thank you just picked up my first mill yesterday

[PALM]

Thank you, Thank you, Thank you!
There is a light!

[Petrolhead]

Great video, to clarify for metric. Say I have a 1” (24.4mm) dia alloy bar. The calculation would be 45000/(3.142x25.4)=564rpm. If I was working in imperial it would be 150x4/1=600rpm

[tectopic]

Excellent informative video. Thanks. And a plus for using a HP RPN calculator!

[terrypickford]

Thanks. You make this so easy. Couldn't quite get it from reading a book.

[darrenhoffmann]

Thanks mate, just the info I was after, and thanks for the metric for the rest of the world