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Author Topic: Machining Stainless-Speeds and Feeds  (Read 5178 times)

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Stomper

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Machining Stainless-Speeds and Feeds
« on: November 25, 2009, 09:05:26 AM »
I need to machine some stainless steel. Would HSS or carbide tooling be good. Also what speeds should I run.
« Last Edit: November 25, 2009, 01:59:52 PM by Masterfabr »
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fabr

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Re: machining stainless
« Reply #1 on: November 25, 2009, 09:08:38 AM »
Mill or lathe? HSS is a poor choice IMO.
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Doug Heim

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Re: machining stainless
« Reply #2 on: November 25, 2009, 09:17:27 AM »
SHARP! HSS works good at about 40 SFM with coolant and or oil.

Carbide tolling you can push it up to 300 SFM.

What grade, size and type of cut. ll get you pointed in the right direction!  ;D
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fabr

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Re: machining stainless
« Reply #3 on: November 25, 2009, 09:23:42 AM »
That he will!
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

Stomper

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Re: machining stainless
« Reply #4 on: November 25, 2009, 09:36:08 AM »
SHARP! HSS works good at about 40 SFM with coolant and or oil.

Carbide tolling you can push it up to 300 SFM.

What grade, size and type of cut. ll get you pointed in the right direction!  ;D

Its just some small stuff and not very much. Its 316L. And it's on a lathe. I won't be using the auto feed as it's a small job. I don't have a coolant pump on my lathe. SFM ???. I was thinking RPM :-[. As you can tell I'm not much of a machinist. Just learning
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fabr

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Re: machining stainless
« Reply #5 on: November 25, 2009, 09:43:45 AM »
DOug will fill ya in I'm sure but SFM is calculated by taking the circumference X rpm. Example is 1" round has 3.1416" circumference X say 300 rpm on lathe the formula is 3.1416X300 divided by 12"(to convert to feet) = 78.54 SFM
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

Stomper

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Re: machining stainless
« Reply #6 on: November 25, 2009, 09:49:33 AM »
So SFM is: circumfrence X rpm divided by 12" = speed in feet per minuite ???.  BTW nice simple example. Thats what I need ::)
« Last Edit: November 25, 2009, 10:01:50 AM by Stomper »
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fabr

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Re: machining stainless
« Reply #7 on: November 25, 2009, 11:56:11 AM »
yup
So SFM is: circumfrence X rpm divided by 12" = speed in surface feet per minuite ???.  BTW nice simple example. Thats what I need ::)
yup
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

Doug Heim

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Re: machining stainless
« Reply #8 on: November 25, 2009, 12:28:36 PM »
We refer to SFM alot as "Surface Speed" here at the shop as many do.

Here are simple speeds to keep in mind for material and tool types...


Coated (TIN) carbide inserts...
-Steel = 500 - 750
-Aluminum = 750 - 1200
-Stainless = 250 -350


Non Coated Carbide tooling...
-Cut above speeds in 1/2.


HSS Tooling...
-Stainless = 40
-Steels really depend on grade and hardness and wether it is leaded, but a good mild steel you can run up to 200.


Here is another tidbit of info I can offer... When running HSS there really is no limit to how slow of RPM you can run. When cutting with Carbide that rule does change on the tool chip geometry, material, and depth of cut as Carbide will chip or break easier that HSS. You will Just burn up HSS if you go too fast.

OK, Now to find the RPM.

SFM X 3.82 / diameter of cut = RPM

so on a 1" diameter cut of stainless (304 - 316) here is the "fill in" below.

300 SFM X 3.82 divided by 1" = 1146 RPM

noncoated is 1/2 of that so nowitsabout 575 RPM

HSS I say about 40 SFM so here is that break down...

40 X 3.82 divided by 1" = aprox 150 RPM

And so on and so on.

The material your cutting, the L stands for leaded stock as you may know. This is good for you as it will be easier on your tooling.

Hope that helps!

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fabr

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Re: machining stainless
« Reply #9 on: November 25, 2009, 01:38:38 PM »
You just got stickied! ;D ;D Good info right there!
« Last Edit: November 25, 2009, 01:51:55 PM by Masterfabr »
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

Boostinjdm

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Re: machining stainless
« Reply #10 on: November 25, 2009, 04:00:28 PM »
You just got stickied!

My GF hates that...
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This post has been edited due to content.

hemi43

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Re: Machining Stainless-Speeds and Feeds
« Reply #11 on: November 25, 2009, 05:03:45 PM »
I hate cutting stainless !!
I hate welding stainless !!
I hate shearing stainless !!
I hate buffing stainless !!
If it has to be made from stainless, double the labour costs!!
Just my opinion !! ;D

Correct me if I'm wrong, but I thought that the"L" meant it was low carbon ! ???

scroll down half way on this link 
http://www.lenntech.com/stainless-steel-316l.htm

« Last Edit: November 25, 2009, 05:08:30 PM by hemi43 »
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hemi43

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Re: machining stainless
« Reply #12 on: November 25, 2009, 05:10:54 PM »
My GF hates that...

Yeah!! I know she does LMAO

Sorry !! I couldn't resist !!  ;D
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fabr

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Re: Machining Stainless-Speeds and Feeds
« Reply #13 on: November 25, 2009, 07:08:09 PM »
My GF hates that...
I thought it was slimed she hated. ;) ;D ;D
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

hemi43

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Re: Machining Stainless-Speeds and Feeds
« Reply #14 on: November 25, 2009, 08:12:35 PM »
I thought it was slimed she hated. ;) ;D ;D

First she gets slimed, then she gets stickied !!  ;)
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