That has to be the clearest and most detailed explanation of what sfm is and the formulas of how to calculate it and its relation to rpm. I really liked the example at the end where you stated how its how far a particular size drill moves while spinning at a specific rpm when rolling it on the ground. I've been told this explanation a dozen different ways but never felt like I really understood it. Thank you!
I think it’s good to learn not just how to do something but why. Not just how to work an equation but what do all the inputs mean and what does the output mean. In my opinion it makes it easier to remember and creates a deeper understanding.
Great video. I just starded working at a small machine shop. I have no expirience and they put me on at old turret lathe they call it A1. We work with alot of different metals alluminum/1018/1215/1045/4140/410/17-4ph/316/nitronic. Is there a way to figure out the smf for these materials or some kind of chart i can use. We use both high speed drills and carbide tips. Or maybe a way to figure out smf using brinnel hardness. Please help
There are several variables to consider (such as the cutting tool and depth of cut) and while I can mention a starting point, trial and adjustment will find the best speed for your application. Cutting tool manufacturers will usually have recommended SFM for their tools and application. I have a copy of the Machining Data Handbook that is no longer in print but a valuable resource for general / starting point information, it states that for ductile cast iron using high speed steel an SFM of 150 is good and with carbide it’s 500 SFM.
oh for fucks sake, it's the same thing, just another acronysm to confuse things! FPM can't we just say FPM , really how do we need SFPM? anyone? Does anyone NOT know d x π / 12 = f, x rps = FPM or SFPM isn't it the same thing? NARF!
Great video. I just starded working at a small machine shop. I have no expirience and they put me on at old turret lathe they call it A1. We work with alot of different metals alluminum/1018/1215/1045/4140/410/17-4ph/316/nitronic. Is there a way to figure out the smf for these materials or some kind of chart i can use. We use both high speed drills and carbide tips. Or maybe a way to figure out smf using brinnel hardness. Please help
There are many variables both in the materials being cut and the cutting tools that determine the optimal speeds and feeds. In general, harder materials require less SFM while softer materials can use higher SFM. Stainless while not harder than regular steel does better with lower SFM. Carbide does better with higher SFM and HSS requires less SFM. Chip load is also a factor that needs to be considered. The best book for finding a good starting point with most materials and cutters would be the Machining Data Handbook by Metcut Research. They lean towards the aggressive side but are mostly on point and it’s a good starting point / information. It doesn’t look like it’s currently being sold, so you would need to find it used. It comes in a set of two books. From the list you showed the toughest materials to cut are the 316 and Nitronic stainless steels. I typically cut them at 180 sfm with carbide and 35 sfm with HSS/Cobalt. The number you end up with will need to satisfy your cycle time vs tool life requirements. Hopefully this helps. Ideally there should be someone there to help you. It’s a steep learning curve without prior experience. I’ve tested the limits over the years and learned a lot.
That has to be the clearest and most detailed explanation of what sfm is and the formulas of how to calculate it and its relation to rpm. I really liked the example at the end where you stated how its how far a particular size drill moves while spinning at a specific rpm when rolling it on the ground. I've been told this explanation a dozen different ways but never felt like I really understood it. Thank you!
Just the help that I needed, Thank you, Joe.
Now why couldn't 'they' just say that? Everyone has to get all fancy, but you just broke it down to practical.
Thank you.
I think it’s good to learn not just how to do something but why. Not just how to work an equation but what do all the inputs mean and what does the output mean. In my opinion it makes it easier to remember and creates a deeper understanding.
@@McCoskeyPrecision ok
It was that last sentence what made me understand the whole thing.
Great video. I just starded working at a small machine shop. I have no expirience and they put me on at old turret lathe they call it A1. We work with alot of different metals alluminum/1018/1215/1045/4140/410/17-4ph/316/nitronic. Is there a way to figure out the smf for these materials or some kind of chart i can use. We use both high speed drills and carbide tips. Or maybe a way to figure out smf using brinnel hardness. Please help
What would be the best speed for surfacing cast-iron disc?
There are several variables to consider (such as the cutting tool and depth of cut) and while I can mention a starting point, trial and adjustment will find the best speed for your application. Cutting tool manufacturers will usually have recommended SFM for their tools and application. I have a copy of the Machining Data Handbook that is no longer in print but a valuable resource for general / starting point information, it states that for ductile cast iron using high speed steel an SFM of 150 is good and with carbide it’s 500 SFM.
thank you
what is "D" ( diameter) unit? inch or cm?
For this calculation it's in inches.
How to calculate mpm
just multiply pie x 12inches will give you 3.82 constant than you can find your speed and ipm alot easier
12 x 3.1416 = 37.699
am I missing something here? Its the second time I see someone using 3.82 and I don't know where it came from.
It's "Pi", (as in Greek), not "pie" as in pizza!!!!!!
Dear repeat again because full prove the slove rpm and sfm
Surface feet /minute = cutting speed?
Yes, surface speed is cutting speed
McCoskey Precision
Thank you .
Uh Not This One....
ggog
oh for fucks sake, it's the same thing, just another acronysm to confuse things!
FPM can't we just say FPM , really how do we need SFPM? anyone?
Does anyone NOT know d x π / 12 = f, x rps = FPM or SFPM isn't it the same thing? NARF!
Great video. I just starded working at a small machine shop. I have no expirience and they put me on at old turret lathe they call it A1. We work with alot of different metals alluminum/1018/1215/1045/4140/410/17-4ph/316/nitronic. Is there a way to figure out the smf for these materials or some kind of chart i can use. We use both high speed drills and carbide tips. Or maybe a way to figure out smf using brinnel hardness. Please help
There are many variables both in the materials being cut and the cutting tools that determine the optimal speeds and feeds. In general, harder materials require less SFM while softer materials can use higher SFM. Stainless while not harder than regular steel does better with lower SFM. Carbide does better with higher SFM and HSS requires less SFM. Chip load is also a factor that needs to be considered.
The best book for finding a good starting point with most materials and cutters would be the Machining Data Handbook by Metcut Research. They lean towards the aggressive side but are mostly on point and it’s a good starting point / information. It doesn’t look like it’s currently being sold, so you would need to find it used. It comes in a set of two books.
From the list you showed the toughest materials to cut are the 316 and Nitronic stainless steels. I typically cut them at 180 sfm with carbide and 35 sfm with HSS/Cobalt.
The number you end up with will need to satisfy your cycle time vs tool life requirements.
Hopefully this helps. Ideally there should be someone there to help you. It’s a steep learning curve without prior experience. I’ve tested the limits over the years and learned a lot.
@@McCoskeyPrecision wow, thankyou for taking your time to respond and for the very thorough answer. You are very helpfull.