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Vaccum Table Workholding ?

86357 (Mechanical)

(OP)

23 Nov 02 11:41

Hi, Im looking for information and techniques for using a vaccum table for machining mostly aluminium, tips to prevent mat'l, warping. speed & feed + depth of cut comparisons for cutting Steel, Titanium, Ally. Im finding small components are no problem although im wary of going full throttle incase job moves. A large 3mm ally plate with a tight flatness Tol, came off like a banana, although very funny at the time i do not wish to repeat.

pirko (Aerospace) · Answer 1 · 2002-11-26 00:51:03

Dear friend,
we have more experiences with vacuum table and clamping. WE CUT 5 X 2 METERS SKIN FOR Aerospace. We cut sheet´s parts with holes on vacuum (this is not miracle) If you are interested in more information let me know.
Regards Libor

86357 (Mechanical) · Answer 2 · 2002-11-27 12:17:09

Yes Libor, largest capacity would be 1.5m * .5m. Please more information would be appreciated. Tnak you.

pirko (Aerospace) · Answer 3 · 2002-11-28 00:51:10

Dear Friennd,
Send me more informations Thicknes of sheets, material, sketch. Regards libor

lapuser (Mechanical) · Answer 4 · 2002-12-12 21:25:51

This topic is of interest to me also re cutting delrin in pieces up to 19 x 26 ". If anyone replying to 86357's post could help in this regard it would be appreciated. Thanks, Dave

JOVATO8 (Industrial) · Answer 5 · 2002-12-28 22:44:04

Hey! PIRKO,

If you do not mind I could use info on vaccum fixtures.
I would like to build my own and have build 2 but would like to find a way to use them for various jobs.
I have checked out the VAT-MAT ,but the price is way out of line for the number of times that I will use them.

Thanks
Joe

MachineDude (Aerospace) · Answer 6 · 2002-12-30 09:08:13

JOVAT08: For a lower cost solution you may want to look into invert-a-bolt. I have seen them used to replace vaccum fixtures.

pirko (Aerospace) · Answer 7 · 2003-01-02 04:27:49

Dear JOE,
I know Witte. We use vacuum pump from Witte. VAc-Mat is very expensive. We use MDF boards for clamping sheets parts .
I don´t know how you tell in USA. This is paper pressure board. This boards are semileaky. WE use MDF board for parts which is cut throug. For parts which is not cut through we use ALU table with droove. Regards Libor

knobhead (Aerospace) · Answer 8 · 2003-01-02 15:20:03

Maybe try this thing.
I saw it at MACH 2002 and it looked pretty impressive.

http://members.aol.com/axcontrols/case1.htm

Excessive accuaracy is a sign of poor breeding. -Socrates.

JOVATO8 (Industrial) · Answer 9 · 2003-01-07 01:16:28

Hi! Pirko,Knobhead,MachineDude and everyone else

Thank you for the info you guys posted in
reply to my post.
I will pursude all leads.

Have a Great Day
Joe

Jimbo51 (Mechanical) · Answer 10 · 2003-01-07 11:38:37

I've made a number of vacuume fixtures and I've found that the size of the holes really makes the difference.   1/32 dia works well...about a hundred thou apart
Also when programming,  use HSM,   large removal rates through light cuts.   That way you are not inducing stress back into the work piece and not bulldozing the part around on the fixture
pocket  with trochoidal tool paths!!!!
Hope this helps
Jim

JOVATO8 (Industrial) · Answer 11 · 2003-01-09 01:33:24

PIRKO,

My friend,I am having a hard time finding this MDF board.
There are many kinds of this material.
If you or anyone else can offer any info to find this
material,please let me know.

Thank You in advance for the help
Joe

pirko (Aerospace) · Answer 12 · 2003-01-09 02:52:18

Dear Joe,
try this addres http://www.finnforest.com/main.asp?path=1
You can ask abou detail. Good Luck Libor Pírko

gab4055 (Aerospace) · Answer 13 · 2003-01-13 13:28:24

Look at this site the Vac-Mat system has worked well for me with added stops.

http://www.mmsonline.com/articles/059701.html

You can build your own chuck and just buy, mats in any type of production setting they will pay for them self many times over.

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