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Author Topic: Need speed/feed opinions.  (Read 8388 times)

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Offline fabr

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Need speed/feed opinions.
« on: February 25, 2010, 11:21:03 AM »
Using 2 flute TiN coated end mill.   .375,.500 and .750 sizes. CUtting aluminum dry. What is your opinion on speeds/feeds/depth of cut and cut offset? AlibreCAM has a table but it seems to be a bit too aggressive to me. Looking for opinions other than -turn the coolant on dummy!   rofl
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Bennyhanna

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Re: Need speed/feed opinions.
« Reply #1 on: February 25, 2010, 11:38:25 AM »
why are you cutting dry?  Do you have at least a mist setup because anything
will help greatly. If  you buy carbide you can run them wfo on aluminum as far as the rpm goes.  should be able to take about .250 cut on the .500 and .750 endmills with about a .003 chip load per flute.  so at 3000rpm lets say, that would be about 20 ipm on a 2 flute endmill.
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Offline Doug Heim

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Re: Need speed/feed opinions.
« Reply #2 on: February 25, 2010, 11:40:14 AM »
Man, to be honest that a very broad question. Id run coolant if you can! Aluminum will just weld its self to the cutter. At least run a mister but recomend a flood. If you cant run coolant you will need to slow it all down, Dry, cut below in 1/2.

40 taper tooling ?...

High speed or carbide?  (even though its coated this does matter)

good set up, rigid machine?

HSS...

Depth of cut... 1X the diameter with coolant.
Feed... .002 - .003 per flute, per rev.
RPM... 750 SFM (aluminum)

to find; RPM= (3.82 X sfm) / diameter of cutter

to find inches per minuite(ipm), RPM X feed per rev.

Example: 1/2" 2 flute cutter HSS...
3.82 X 750 = 2865
2865 / .5 = 5730rpm

ipm = 5730 X .006 (per rev) = 34.38 ipm
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Bennyhanna

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Re: Need speed/feed opinions.
« Reply #3 on: February 25, 2010, 12:11:58 PM »
considering you are a noob there fab-star (that's how I think of you in
my mind), I would start with a smaller depth of cut and see how your machine
reacts.  Can probably shoot for about a 70% stepover. And you should program
it at the machine like a real man!!!
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Offline fabr

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Re: Need speed/feed opinions.
« Reply #4 on: February 25, 2010, 12:59:47 PM »
Really I'm just screwing around. Doug,those formulas are what I was always taught with coolant and are what the AC has as a standard database. It can be easily changed.  . I'll  of course be running coolant but just hadn't gotten the hydrosweep chip collector/coolant in place yet. That might be another whole new can of issues I need to avoid right now just so I can make it to LS-with a fricken car this time. I'm tired of this bumming a ride crap. LOL!!.  Thought I'd try one dry or near dry as I have a mist setup for the bridgeport just to get going for now. Bennyhanna, I agree completely also. I've already run a couple test items dry. Won't be as nice as I'd like but will serve the prototype well enough for sure.
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Offline fabr

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Re: Need speed/feed opinions.
« Reply #5 on: February 25, 2010, 01:24:39 PM »
Quote from: Bennyhanna on February 25, 2010, 12:11:58 PM
considering you are a noob there fab-star (that's how I think of you in
my mind), I would start with a smaller depth of cut and see how your machine
reacts.  Can probably shoot for about a 70% stepover. And you should program
it at the machine like a real man!!!
I call BS on this! LOL!!!!!
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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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Bennyhanna

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Re: Need speed/feed opinions.
« Reply #6 on: February 25, 2010, 01:33:59 PM »
i program everything at the machine now for 15 yrs.
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Offline Doug Heim

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Re: Need speed/feed opinions.
« Reply #7 on: February 25, 2010, 02:06:32 PM »
FWIW so do I   :P
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Offline BDKW1

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Re: Need speed/feed opinions.
« Reply #8 on: February 25, 2010, 03:11:25 PM »
I can and do for small jobs but for the majority of stuff it's just not practical.......
 
 
Faber, rig up an air nozzle to blow on the tools. This will help keep the end mill from loading up. Coolant is still preferable..........
 
 
Program it up like it was for coolant and turn the speed and feed knobs down to 50% till you get the coolant running........
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Offline fabr

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Re: Need speed/feed opinions.
« Reply #9 on: February 25, 2010, 04:41:04 PM »
If the hydrosweep/coolant system gives me problems I'll either do air or mist but you guys have already shamed me into getting it on the machine and I'll see if it works tonite or tomorrow or,or,or............
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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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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline fabr

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Re: Need speed/feed opinions.
« Reply #10 on: February 25, 2010, 04:42:26 PM »
Quote from: BDKW1 on February 25, 2010, 03:11:25 PM
I can and do for small jobs but for the majority of stuff it's just not practical.......
 
 
Faber, rig up an air nozzle to blow on the tools. This will help keep the end mill from loading up. Coolant is still preferable..........
 
 
Program it up like it was for coolant and turn the speed and feed knobs down to 50% till you get the coolant running........
exactly what I do on the Bridgeport now. Thanks for the tip tho.
« Last Edit: February 25, 2010, 04:44:00 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

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Offline BDKW1

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Re: Need speed/feed opinions.
« Reply #11 on: February 25, 2010, 05:00:07 PM »
What are you planning on using for coolant?
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Offline fabr

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Re: Need speed/feed opinions.
« Reply #12 on: February 25, 2010, 05:10:18 PM »
WIndex? LOL!!!!
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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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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline fabr

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Re: Need speed/feed opinions.
« Reply #13 on: February 25, 2010, 05:11:05 PM »
What do you suggest? Soluable oil,semi synthetic or synthetic?
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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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Offline fastcorvairs

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Re: Need speed/feed opinions.
« Reply #14 on: February 25, 2010, 05:30:42 PM »
Quote from: masterfabr on February 25, 2010, 05:11:05 PM
What do you suggest? Soluable oil,semi synthetic or synthetic?

Perkins PRI-Cool 853-B
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