Speeds Feeds and Depth of Cut for Milling

Learn an easy method of getting your correct spindle speed , your feed, and depth of cut with out looking it up in a book. once you remember these basic formulas it will increase your time cutting metal and decrease the amount of tooling you break by using bad numbers

[@MotoBuilds]

Literally the most helpful and straight-forward video online on the subject. Thank you.

[@The_old_geezer_geek]

Thanks so much for the nice compliment, so glad you liked it

[@MotoBuilds]

@@The_old_geezer_geek I am a newbie at machining, but have some parts i wanted to make and sell so i bought a CNC while being completely ignorant about engineering/design/milling. I incorporated your tips and equations into my CAM programming last night for speeds and feeds (I did go a bit milder for radial and axial depths of cuts just to be conservative) and will be running them on a batch of parts tonight, looking forward to the never-ending learning process and very grateful for the advice. Have a good day!

[@tdg911]

Wow very clear and concise instructions. I was struggling learning this because 99% of the other instructions were over complicating for me. Thank you

[@The_old_geezer_geek]

Thanks so much for watching

[@michaelrudisill5148]

Thank you. Perfect explanations, short, to the point. Exactly what I was looking for for some reference.

[@The_old_geezer_geek]

Thanks, glad you liked it, and thanks for watching my video

[@AlphaBobFloridaOverlord]

Thank you! Just what I needed- was having trouble figuring this out by myself.

[@craigtate5930]

Great info, explained very well. Thanks

[@The_old_geezer_geek]

Craig Tate glad you liked the video, thanks for watching

[@danmccurry3810]

Thanks for speeds and feeds in a nutshell. It's always better to be technically sound instead of using trial and era.

[@The_old_geezer_geek]

Thank you so much for taking the time to watch my video

[@Vipul.Canada]

Very nIce video .

[@The_old_geezer_geek]

Thank you

[@vitorhugodeoliveira4233]

Where can I find a Machining Factor chart? Or the value for different types of wood.

[@The_old_geezer_geek]

Thanks for watching my video

[@elguitarzero81]

Awesome information!!! Thank you so much. I was just wondering if you would be so kind as to provide this information for carbide endmills? ( Since thats is what i use at the shop)

[@The_old_geezer_geek]

Thanks for watching, I’ll try to put something together for carbide, but in the meantime, if you take the HSS speeds and multiply it by 2 1/2 to 3 times, that is a pretty safe rule of thumb

[@elguitarzero81]

@@The_old_geezer_geek Thanks a lot. I'll test it out at the shop tomorrow. Have a great day

[@hunternull8320]

How do you determine axial depth of cut when the width of cut is less than 50%?

[@stephenfielding2672]

when will you make a lathe video

[@kaboomcycle0]

exactly what I needed. thank you!

[@The_old_geezer_geek]

Thank you for the kind words, and thanks for watching.

[@JasonScottHamilton]

Great info. I’ve worked through the calculations but I have a mini mill so need to back off somewhere. I assume you would back off on the depth until you got to a HP number that your machine can handle?
Also, I assume if you discounted the max machine horsepower (say like 50%-75% of rated?), that would account for a less rigid machine?

[@The_old_geezer_geek]

Jason Hamilton exactly

[@JasonScottHamilton]

TheOldGeezerGeek thanks!

[@pedub2222]

Great video, were did you get the 200 from for the chip load? just wondering , never seen it before

[@T77083]

Can ya make a speeds and feed video for lathe?

[@The_old_geezer_geek]

I will make a video for speeds feeds and depth of cut on the lathe very soon. Thank you for the request

[@sohamdeshpande7072]

from where have you taken the constant '200' for feed per tooth

[@The_old_geezer_geek]

soham sd I took it from a machining handbook

[@ramanak2213]

Tim sir, With carbide end mill 8 mm 4flute vc 40m/min . by using ur formulas.. n=1600 feed=256 mm/min Depth of cut=4mm(D/2) broked it for the first pass itself.. please help me....

[@The_old_geezer_geek]

Hi Ramana, sorry you broke a tool, I came up with a spindle speed that should be 4850 revolutions per minute and the feed would be 30 inches per minute, is that what you came up with as well?

[@ramanak2213]

@@The_old_geezer_geek I have calculated like n=Vc*318/D it's n=40*318/8 and it's n=1590 rpm.. Then feed=1590*4*(8/200) which euals 254 mm/min and depth of cut like cutter dia by 2 so 8/2=4, by the way my work piece mtrl. is SS316..

[@The_old_geezer_geek]

Ramana k s v your spindle speed is way to slow, I don’t know if something is getting lost in the conversion from inch to metric, but you should have your rpm at about 4800 rpm. If you run it at 1600 rpm it will break tools

[@ramanak2213]

@@The_old_geezer_geek Yes sir . that's the problem. all the videos I found about cutting parameters are in Inch mode only.. but here in India we use metric method only, and the resources regarding education like this are very less, but I once again check the parameters, tomorrow(it's 11.50 pm here), and come back to u, when I go to my work, I think it's the depth of cut, which breaked my tool, I have never used above 1mm depth, up to 18mm dia tools, thanks for replaying sir and enjoy ur Sunday.. Thanks allot..

[@ramanak2213]

Hi.. sir, today by using 14 mm 4flute carbide cutter of Vc=45 m/min, I have got speed 1022 rpm feed 286 mm/min, and for depth of cut I have used 1/8 Instead of D/2, so I have got 1.75 mm, and surpriIngly, I have reduced my cycle time from 30 minutes to 12 minutes, and the finish is like extremely well, but adjusting depth of cut to 1/8 D, my cutter also is in good condition, Thanku.

[@Alloush1980]

Really thx.

[@The_old_geezer_geek]

The number 200 is just a constant I learned along time ago and it has worked good for me. I think I got it from a chart from a tool salesman
Thanks so much for watching

[@Valentina-sg2wl]

👏😄

[@robcean]

Thank you! That's what I looking for...