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titanium

 
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  #8  
Old 10-11-2003, 01:04 AM
daveosok
 
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Re: titanium

NightHawk
If its what I'm thinking your talking about wire edm?
We have a wire edm and it cuts through anything that conducts electricity. Ti cuts a lot like Al does. One problme with edm machining is the haz area (heat effected zone)this is the area of metal that is brittle and needs to be either ground off or chemically removed as it will set up your piece to fail with micrograin structure cracks.
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  #9  
Old 10-11-2003, 03:32 AM
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Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: titanium

Davosok,

Maybe you can clue me in on how one can get some ramps cut in the bolt lug abutments... converting a right hand AR-30 into a lefty?

I was told a gentlman on the east coast makes barrels with an EDM for the Contenders, a slow process, 8 hrs I think was stated. He does others too if you want a one time job and don't need a reamer later if you plan on setting the bbl back and doing it again. He charges about $150 I was told.

My smith, Dave, he was making a brake with Ti last month for a big boomer he was building a guy.
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Brent Moffitt
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  #10  
Old 10-12-2003, 04:06 PM
daveosok
 
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Re: titanium

Brent
I would suggest a ram/sinker style edm for machining ramps.
We had an autofatage (sp?) machine which was used to stress relieve the tubing since Ti has a memory and wants to return to its orignal shape (when dealing with tubing that is) this machine would pressurise the tubing. We have taken 3/8ths lines up to 22,000 psi before bursting and that was with .049 wall thickness.
EDMing is by no means the fastest way to do anything it does take a long time but the accuracy is about as close as your going to get. Our machine is set right now to .00006 millinoths and has a repeatability of .00002. It can produce a 10~14 micro finish and if we get the .004 thou diamond guides for the wire I can produce a 3~4 microfinish.
Its a neat machine and very interesting to see what comes out of it.

[ 10-12-2003: Message edited by: daveosok ]
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  #11  
Old 10-12-2003, 04:11 PM
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Join Date: Jul 2002
Location: Atlanta
Posts: 61
Re: titanium

Any tours available for me dave? [img]images/icons/smile.gif[/img]
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  #12  
Old 10-12-2003, 04:13 PM
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Location: Palmer, Alaska
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Re: titanium

Thanks Daveosok. Can you cut the ramps or know someone who would be set up to do it?
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  #13  
Old 10-12-2003, 08:18 PM
daveosok
 
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Re: titanium

Brent
I'd really need to see a print of what your talking about but think I have an idea.
The wire edm wont cut blind areas, think of a bandsaw only the cutting device is non-resuable.
The machine is a Mitsubishi FX30 their new model is the CA30 which is basically the same machine but can feed the wire in about 15 seconds whereas ours has to drain the tank and then wire itself.

John
A while back I could have scheduled a tour but after sept 11th kinda hard now sorry dude.
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  #14  
Old 10-12-2003, 08:25 PM
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Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: titanium

You're right, the ramps are about the exact same thing as on a Remington 700, and a wire EDM won't work for that. I was thinking you had the other type EDM that they do chambers and other stuff like that with, forget what that type's called tho.
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