O/T Surface Footage

Rekd™ · April 22, 2003

I'm running a .375 dia EM at 131.25 SFM.

'Rekd teh 1337 RPM

mold100 · April 22, 2003

4 flute with .004 c.l.=21.392 i.p.m

chris m · April 22, 2003

Am I missing something here?

Chris teh WTF are you talking about?

[ 04-22-2003, 11:23 AM: Message edited by: chris m ]

Jack Mitchell · April 22, 2003

Chris,

Just a little mathematics for those G94 fans.

Corey - how are you making out? Did you find another job?

Regards, Jack

mold100 · April 22, 2003

Not exactly,

I am sorta in a position to eventually take a shop over, Currently I am there on a part time base, it closed but I have managed to help get it back on its feet, though right now things are pretty slow.

Thanks for asking.

Trevor Bailey · April 22, 2003

What are you cutting Matt? Why is feed/speed so slow?

CPeast · April 22, 2003

4" Face Mill running at 6283.18 SFM

Dave teh 6000 RPM

Or ... in my little inaccurate but simple world:

4" Face Mill ... SFM = RPM

Dave teh slightly oversped

Slick · April 22, 2003

Hey! Do youm ind me interjecting a relative question?

Let's say a 3/8 EM can handle 2020 SF with a 0.008 Chip Load (20576 RPM, 329.0 IPM), 'course this is suggested, and not something I've ever seen. Anyhow's, so you take your formula and come up with that and low and behold your spindle only goes up to 9000 RPM, bumping you down to 883 SF and 144 IPM. So the big question I am wondering is: What's the consensus for reducing chip load/feed rate to accomidate for your reduced spindle speed? Do you keep it the same? Or do you cut it back a certain percentage?

chris m · April 22, 2003

Slick

Assuming you're saying that you have a 2FL mill that'll take .008/tooth (which seems like a hell of a lot for a 3/8 endmill) then: yes, I would run it at the 9000 RPM of the machine and 144 IPM.

We have to do that a lot in aluminum because we only have 10,000 max RPM in our fastest machine.

C

mold100 · April 22, 2003

I believe it was once said run the max till it breaks then back off 10%.

Trevor Bailey · April 22, 2003

SFM = 3796.091

RPM = 14500

IPM = 500

Chip Load = .01149 per tooth ( 3 fl )

You should see the chips fly.

I have a couple of clips I can put on Jay's site if he will let me. They are kind of big.

McRae · April 22, 2003

Corey - I tried this once a long time ago, I can only suggest that you make sure you have two endmills first before you begin!

cadcam · April 22, 2003

Treavor bring it on. you have my Permission.

iowajim62 · April 22, 2003

SFM = 5078.534

RPM = 9700

IPM = ?

Chip Load = .041237

ADC = .200

2" Iscar Insert Cutter 2 Flt.

Can you say Bulletmaker ?

CPeast · April 22, 2003

So was this thread just another example of 'Rekd thinkg out loud ???

iowajim62 · April 22, 2003

No it's Rek'd being coincidentally funny I think.

quote:

Let us not forget about "1337 5p33k" (that's pronounced "elite speak"); the most annoying form of communication on the Internet that's fun at the same time

i.e. 1337 Rpm

Rekd™ · April 22, 2003

quote:

No it's Rek'd being coincidentally funny I think.

Jim wins.

It just made me grin when I saw it, thought I'd see what happened if I posted it.

The thread actually turned out interesting.

quote:

What are you cutting Matt? Why is feed/speed so slow?

Some 303. We're gonna try some new EMs tomorrow that have 2 of the 4 flutes at a differen angle, (looking at the end of the EM, flutes are usually rotated 90 degrees on a 4fl, this one has 2 flutes at like 80 degrees). They guarentee them to run 1 dia deep at 300-380 sfm. We'll see.

'Rekd teh "You can tell a lot about a person by the Speeds/Feeds they use."

[ 04-22-2003, 06:41 PM: Message edited by: Rekd ]

chris m · April 22, 2003

Funny how numbers can work out

I actually had a program that had this line in it:

G00 X1.234 Z1.234 M08

I didn't see it when I set the job up; the operator came in after the job was done and said, "I looked at that line about 10 minutes before I was sure it wasn't a joke."

Who could blame him?

Rekd™ · April 22, 2003

quote:

Funny how numbers can work out

Agreed.

Seems every time I look at the clock it's 12:34. Parts with holes at .666 usually get changed depending on the tolerances.

Remember where you were at this time on this day.. 12:34:56 7/8/90

'Rekd teh "Add the ascii values for "William Henry Gates III" and you're in for a surprise.."

[ 04-22-2003, 06:46 PM: Message edited by: Rekd ]

CPeast · April 22, 2003

quote:

Add the ascii values for "William Henry Gates III" and you're in for a surprise.."

And if you divide by 666 and parse it back out ...

Lessee ... hmmm uhh huhhh carry the 1 ....

SATAN OWNS ALL SOFTWARE spooky

But really to follow up on Rekd's Bill Gates Thing Check THIS out.

[ 04-22-2003, 07:54 PM: Message edited by: CPeast ]

iowajim62 · April 22, 2003

Hi Rek'd,

quote:

Some 303. We're gonna try some new EMs tomorrow that have 2 of the 4 flutes at a differen angle, (looking at the end of the EM, flutes are usually rotated 90 degrees on a 4fl, this one has 2 flutes at like 80 degrees). They guarentee them to run 1 dia deep at 300-380 sfm. We'll see.

Is this those new Varimills from Hanita ?

April 22, 2003

1" SC 3 Fl. E/M

12,000 RPM

1260 IPM (.035 FPT)

.5" DOC

Oh, yeah! Man I love Mori Seiki's!!!

Rekd™ · April 23, 2003

quote:

Is this those new Varimills from Hanita ?

Yeah. Fired them up this morning.

So far so good; running around 3012 rpm x 30. ipm. (A bit conservative because I'm holding the short side of a 1 x 3 inch part.) Had to bump my torque wrench up a few notches too. Luckily it seems to have reduced the tool stress enough so that the extra torque isn't making the part deform too much more than it was.

I'll keep you posted. For the price they seem to remove metal well, we'll see how the "200% Increase in Tool Life" holds up.. I got 30ish parts out of the first hogger, so if this finishes the run of 90 I'll buy 'em.

'Rekd teh I love the smell of hot steel chips in the mornin'

CPeast · April 23, 2003

Hey Rekd,

Any noticable difference in spindle load ?

Dave

teh "Under powered"

Rekd™ · April 23, 2003

quote:

Any noticable difference in spindle load ?

Yes. About 10-15%. You can prolly reduce the chip load a bit to help with your lack of, um... I'll leave that one alone. (I remember on the old Fadals I used to use, we would run the spindle at about 95% over-ride to increase the power to the spindle, helped from boggin' it down...)

Chip evacuation is also better. (Important on a VMC). The cycle time dropped about 20% as well. Now all that's left is the longevity.

'Rekd teh Anticipation

[ 04-23-2003, 05:42 PM: Message edited by: Rekd ]

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