Lathe Feeds and Speeds

Learn the Theory behind Machining. What do you need to know to be a Machinist? Welcome to your free Machinist Apprenticeship Training. There is a dire need for Machinists and I want to help.

[@hayknazinyan3492]

The guy is God's deputy when it comes to explain things! So clearly and understandable, Thank you sir.

[@adamtaylor999]

Thankyou @hayknazinyan3492

[@RobB_VK6ES]

Generally well explained but I think you could have explained 2 things here. Derive the the rotational speed formula from first principals i.e. circumference x C/S This gives insight into just what needs to be considered, the units used and hence explain where the 12 came from i.e. converting feet to inches. By undrstanding the derivation you can apply the same principals to any other system of measurement. Why the feed rate is is hard tied to RPM on a manual lathe i.e. The feed screw is geared directly to the spindle since this is not the case with CNC lathe or milling machine.

[@silkroad3442]

I like you talking very clear thank you

[@Universal_Craftsman]

He is standing there in the dark studio like Jonathan Frakes.

[@HoneyMarketingBoard]

Totaly new to the lath. Learning lots. Thanks. UK

[@adamtaylor999]

My pleasure. If there is other content you're having trouble finding please let me know and I'll try and create it in the next round of videos. Have fun making chips!

[@user-kg6hd2ce3k]

i am a student at University of Zimbabwe, this video helped me master my workshop practice. hoping to be the best engineer sooner. Mark this!

[@adamtaylor999]

Hello Bradley, thank you for taking the time to comment. I am glad to be a small part of your education and training. Work hard, as we need dedicated and passionate engineers, machinists and manufacturing professionals on a worldwide scale. All the best on your future endeavors and congratulations on your success in your workshop practice!

[@user-kg6hd2ce3k]

@@adamtaylor999 i have a question on that 12 on the formula for RPM, here we were told to use 1000 as part of the formula or there is a meaning for that value???

[@adamtaylor999]

Sorry Bradley, I don't understand your question. Could you clarify for me? What time in the video you are referring to?

[@tranphuckhanh9582]

Perfect! thank you so much

[@adamtaylor999]

You're welcome! I appreciate you taking the time to leave a comment.

[@uzz786]

Bro,im a mauritian student very competoeus,i love your video,thank you very much may god bless u and give u a long live💝

[@adamtaylor999]

Thank you for taking the time to comment. In the near future I will be releasing several other videos. If there is content that you would like covered and explained, please feel free to let me know.

[@uzz786]

@@adamtaylor999 i would kindly request you to explain me about imperial measurement ex; inches ,pound ,feet ,area about imperial ,inch threads ,fraction degree. Because in my country imperial calculations are not available 😊

[@adamtaylor999]

Hello @x_uzair_7864 Somehow I missed this comment. I am very sorry. Let me see what I can put together for you. Thank you for your patience.

[@sushmitshetty8926]

Namasthe Adam...I am from INDIA, and I would like to know about the type of inserts for turning operations for the INVAR 36. other day you informed me that you would contact a tool supplier like SOWA or ISCAR and get some direction from them. Are there any updates Adam?

[@FrsMorton]

Wish me luck on the test, Adam

[@Kemael89]

Hello, Very nice video! i have question, which is the book you are using, im interested to get it.

[@adamtaylor999]

Technology of Machine Tools 8th edition. Thank-you for your comment

[@Kemael89]

@@adamtaylor999 Thank you so much!

[@santopezzotti730]

Man you are great. I am a 73 year old newbie. Do you ever do any videos on using tools like treading on a manual machine, rotary table, laying out holes in a circle? Any thing with manual machining.

[@adamtaylor999]

I'll see what I can put together. I have a lot of videos in que already.

[@edwardcombs2016]

What text book are you using for your charts? Thanks, Ed C.

[@adamtaylor999]

The textbook is, 'Technology of Machine Tools' 8th edition. Hope this helps - Adam

[@adamtaylor999]

Technology of machine tools is the name of the book. Sorry I missed your comment, my sincerest apologies.

[@sushmitshetty8926]

which standard book we need to refer to know optimal cutting speeds, feed, and depth of cut for turning operations of INVAR 36 material.

[@adamtaylor999]

I don't have experience cutting this material. If the Machinists Handbook doesn't provide specific information on cutting speed, feed and depth of cut then I would contact a tool supplier like SOWA or ISCAR and get some direction from them. Your metal supplier should be able to provide at least the recommended cutting speed for you.

[@sushmitshetty8926]

Namasthe🙏 and thank you so much for your response.@@adamtaylor999

[@sushmitshetty8926]

Metal supplier doesnt have the machining knowledge. And when I checked with the research papers its not available papers for turning of Inavr 36 alloys@@adamtaylor999

[@adamtaylor999]

I would talk to a tool supplier and get their help. I would hate to suggest something without having the cutting experience for this material. Sorry @sushmitshetty8926

[@sushmitshetty8926]

Namasthe and Thanks a lot Adam...@@adamtaylor999

[@quadguy1553]

If you already know about rpm and want to know more about feeds like me skip to <a href="#" class="seekto" data-time="1225">20:25</a>

[@danielsalinas9248]

Sir if you divide 12 / 3.14 = 3.82 x 200 / 2.00 = 382 rpm

[@adamtaylor999]

Hello @danielsalinas9248 If you are trying to solve the RPM for your lathe, then you can simply use the "shop floor formula" which is: 4 X Cutting Speed / Diameter of material For instance, if you are cutting aluminum at a cutting speed of 200 and the diameter of the aluminum is 2.0" then your formula would look like this: 4 x 200 / 2.00 = 400 RPM If you want to use the true formula (which is really only beneficial for setting CNC lathe spindles) then your formula would look like this: (12 X 200) / (3.14 X 2.00) = 382 RPM I hope this helps. Thanks for reaching out. Adam