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John Stevenson
02-28-2008, 08:01 PM
Walked up the road today to the local aerospace company to drop some bits in.

They recently had a new CNC delivered to do a job for the Airbus wing spars that needed 2 meters in the X axis [ 80 " travel ]

Took a week or so to get this tooled up as it requires a few special form tools but it's away running now.

It takes a slab of alloy 2 meters x 1 meter by 100 mm thick and gets two spar brackets out of the one piece, each one takes 11 hours machining.

Watching it work today I asked what it was cutting at and was told 10,000 mm /min. I then asked what the rapids were and was told 10,000 mm/min

Looking at the code reeling thru it was all G00 moves, no G01 feed rate moves.

And I thought I was doing well with some printed circuit boards at 1000 mm/min :(

Oh well back to the drawing board..............


.

BobWarfield
02-28-2008, 09:39 PM
What kind of taper does something like that thing use?

Cutting at full rapids and still takes 11 hours. Wow.

Best,

BW

sconisbee
02-28-2008, 09:50 PM
.....i want one!:(

HTRN
02-28-2008, 10:57 PM
What kind of taper does something like that thing use?

Depending on RPM, Probably an HSK or mebbe a BT30.. BTW, that feed rate is approximately 4000 IPM.


HTRN

moldmonkey
02-29-2008, 12:33 AM
4000 IPM :eek: !!! I assume they are doing the light DOC, small step-over high speed milling thing. I've seen a few videos of that, that are amazing to watch. A ball endmilll just flying along a complex geometry part. Up & down & around.

I've got to go to bed. Tomorrow is another day running a 70's K&T 5-Axiz HMC with rapids of around 100 IPM. :( :) Totally different world.

kmp
02-29-2008, 06:30 AM
Walked up the road today to the local aerospace company to drop some bits in.

They recently had a new CNC delivered to do a job for the Airbus wing spars that needed 2 meters in the X axis [ 80 " travel ]

.

John, having retired a few years ago I'm out of date with this sort of toy. Do they still like Mori Seki or have they found something better/cheaper these days?
Feeling a bit nostalgic as haven't been in an up to date aerospace facility for at last 5 years now. :(

regards

Keith

Swarf&Sparks
02-29-2008, 08:50 AM
have they reallocated the decimal point since I went to school?
10 000mm/min = 393.7007874016 in/min
Still a pretty respectable speed

Spin Doctor
02-29-2008, 06:46 PM
What kind of taper does something like that thing use?

Cutting at full rapids and still takes 11 hours. Wow.

Best,

BW

Probably a #50. 30s are for sissies, 40s are for Girlie men. Real men use #50 taper tooling :D

sch
02-29-2008, 08:25 PM
Reminds me of the 30-45 sec on the Nova program devoted to
the faceoff between Boeing and Lockheed over the F35.
Lockheed showed a forklift bringing in a 3x4' 3" thick slab of
Ti exotica, mounted it on a similar machine and after 12-18hrs
a filigree of Ti was left that the machine operator picked up
easily by hand. It was the skeleton bulkhead between the
pilot compartment and the fuel tank behind the pilot.
Boeing spends most of a shift whittling down AL-Li slabs 4-6'
by 12' that start out ~1" thick and end up with a perimeter thickening
and central cutouts that are then bent into 1/3-1/4 of the circumference
of the rocket and fastened together to form the skin of the rocket.
Guy I talked to about it had the job of sweeping up the chips.

HTRN
02-29-2008, 09:18 PM
have they reallocated the decimal point since I went to school?
10 000mm/min = 393.7007874016 in/min
Still a pretty respectable speed

Oops.:eek:

400IPM is still pretty fast, but far less jawdropping. Most, if not all VMCs can feed that fast today.

Here's a video of CNC mill cutting at 600IPM and 14K RPM (http://www.youtube.com/watch?v=7z8v1JVgQ8o)

HTRN