Mill Feeds and Speeds - solve RPM and Feedrate

In this video you will learn the simple equations for solving spindle speed and feed rate for a manual vertical milling machine.
The textbook I use is, "Technology of Machine Tools" - 7th edition. I am not sponsored by or affiliated with the publisher but I use this book for most of my machining curiosities and I use it when teaching machinist apprentices their theory lessons.
If there is information you would like me to put together in a video please feel free to contact me. Thanks Santo for your request for this content.

Thank you once again for all your support. Have fun making chips!
In addition, the teaching platform I use is from Lightboard Depot. Once again I am not sponsored by or affiliated with them but this teaching tools is fantastic.
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[dewe]

im impressed at your ability to write backwards

[silkroad]

Hi Adam
Thank you for video
Is cutting speed for metric and inch drill same or different? when you use formula N=Vc *318/D and N=Vc*3.82/D?
Also Is cutting speed chart for drill and lathe also mill same?

[jxg]

Should the feed rate for the lathe at 12mins in not be in inches per revolution, instead of inches per minute?

[jesseskellington]

Is there a formula to scaled-down feed speed? If my free rate is 7.353.6 RPMs but my machine max speed is 3, 000. Is there an equation to scale the speed?

[jestonporter]

The correct (simplified) formula is RPM=(SFMx3.82)/Diameter.

People who use 4 instead of 3.82 are the "looks good from my house" guys. To simplify the real formula, you divide 12 (feet) by Pi (used in the circumference calculation). 12/Pi = 3.8197, which you would then round to 3.82, not 4. The book I have from college uses 4 as well, and it drives me crazy because the Machinery's Handbook uses the real formula. In machining, you need to be as accurate as possible, especially with harder materials. Please stop saying 4 is close enough.

***This is not an attack on you, it's an attack on the people who wrote the book that gave you the information.***

Other than that, this is great advice.