Finding the spindle speed for a lathe

I was cutting tool S7 steel today at 800 sfm, wondering why you’re saying 100 here

So now that we have the rpms, how do we get the feeds?

i have always seen it as SFM*(pie)3.14/DIA but i feel like 3.82 could run faster and will try it i work with stainless steel which is harder than a lot of meatal.

👍🏻

What about stainless steel? 250 still gonna work?

Question: If my lathe has a one inch shaft, and I attach a 30" disk to it set at 6rpms, then how fast is the outter edge of the disc spinning?

Would you happen to know the metric conversion formula?

Great video but how do you do the maths with 1 and 3/8 inch ? I’m from the uk and we use mm so I have to convert mm into inch then try and do the maths!

How to define rpm in cnc machine if spindle rpm 24000, how much rpm required for portrait designing engraving on iron,

1943, 11th edition machinery handbook, its in there. You just have to know what your looking at. Your using 250 with with 1". Easy, convert 1" diameter to circumference, and that looks like this. 1 x pi ÷ 12 = .261. (÷12 because were using feet here.) Now you take your 250 ÷ .261 = 957 rpm. Now your hss, your using 1.5 and 100. Again. its in the machinery handbook, all the way back to 1943. Samething 1.5 x pi ÷12 = .392.
Now take your 100 ÷ .392 = 255 rpm. Im literally looking right at this in my book.

My home workshop lathe has a max rpm of 500 and I do loads of smaller diameter which need loads more, any suggestions? Maybe change drive pulley diameter and lose torque? It is 3 hp 240volt 50 cycle motor single phase.

Where can I find the sfm recommendations for the various tools and materials that I work with thats my only issue

How to calculate the feed rate for the lathe? Based on formula please

So the SFM on a lathe, is whatever the recommended number is of the insert or drill or tap is?

What about threading and tapping on manual programming?

How you calculated the feed rate onLathe

is this spindle speed is maximum ? and is it overcome whirling phenomenon in lathe with single supporting system?

how can we find cutting speed according to work piece material without considering spindle speed?

Great video. Thank you for the explanation.

Bruh...WTF you write backwards and inside-out for...ur 5 looks like an upside down Z crossed with an inbred 2...jeezus phuC...I'm gonna seriously lose my shit on that damn 5!!!

If you're drilling on the lathe do you still use the diameter of the material or do you use the diameter of the drill bit for the equation

the DIAmeter would be the final diameter OR the initial diameter of the workpiece OR the difference (which is to cut off)??

Very helpful straight to the point

What if you exceed the speed limit of the machine? What to do?

Thanks very helpful