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Posted by Ed Huntress on May 10, 2008, 11:27 am
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>
>> Not that I know of, Dan. Titanium has a reputation for not work-hardening
>> very much. It's worth checking out, in the machining context, but I'm
>> pretty
>> sure that's the situation in general.
>>
>> Titanium can be miserable to machine -- I remember doing some machining
>> of
>> it back in the mid-'70s -- but my recollection is that it was more tough
>> and
>> gummy than hard. But that's pretty far back in memory for me.
>>
>> --
>> Ed Huntress
>
> Hmmm. I did a little looking on the internet and found sites that
> said Titanium work hardens about like 1020 steel, that is not a lot.
> But they followed this with warnings not to do anything that would
> work harden it. Possibly more because it will gall and also because
> it does not conduct heat well. So it sounds as if you can't harden
> titanium much by work hardening, you need to machine it as if it does
> work harden.
>
> Dan
In the sense that it's not easy to machine, I suppose that's true. But
again, I remember it being tough and requiring a lot of power to cut, not
that it's hard. The maximum hardness you can get with titanium alloys, IIRC,
is in the range of Rc 40.
I'm sure there's good info on machining it around the Web. I just haven't
looked. The public-transportation guys have been keeping me busy. d8-)
--
Ed Huntress
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Posted by Bruce in Bangkok on May 11, 2008, 3:20 am
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On Sat, 10 May 2008 08:17:16 -0700 (PDT), "dcaster@krl.org"
>
>> Not that I know of, Dan. Titanium has a reputation for not work-hardening
>> very much. It's worth checking out, in the machining context, but I'm pretty
>> sure that's the situation in general.
>>
>> Titanium can be miserable to machine -- I remember doing some machining of
>> it back in the mid-'70s -- but my recollection is that it was more tough and
>> gummy than hard. But that's pretty far back in memory for me.
>>
>> --
>> Ed Huntress
>
>Hmmm. I did a little looking on the internet and found sites that
>said Titanium work hardens about like 1020 steel, that is not a lot.
>But they followed this with warnings not to do anything that would
>work harden it. Possibly more because it will gall and also because
>it does not conduct heat well. So it sounds as if you can't harden
>titanium much by work hardening, you need to machine it as if it does
>work harden.
>
> Dan
At one point I did some work on the SR-71's which had titanium skin. I
have no idea what alloy it was but it seemed similar to stainless
except that it work hardened even worse. It seemed like if the drill
slipped for one revolution the stuff became uncutable. We used a lot
of carbide drill bits in the short time we supported them.
Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)
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Posted by Stealth Pilot on May 11, 2008, 7:54 am
Please log in for more thread options On Sun, 11 May 2008 14:20:16 +0700, Bruce in Bangkok
>On Sat, 10 May 2008 08:17:16 -0700 (PDT), "dcaster@krl.org"
>
>>
>>> Not that I know of, Dan. Titanium has a reputation for not work-hardening
>>> very much. It's worth checking out, in the machining context, but I'm pretty
>>> sure that's the situation in general.
>>>
>>> Titanium can be miserable to machine -- I remember doing some machining of
>>> it back in the mid-'70s -- but my recollection is that it was more tough and
>>> gummy than hard. But that's pretty far back in memory for me.
>>>
>>> --
>>> Ed Huntress
>>
>>Hmmm. I did a little looking on the internet and found sites that
>>said Titanium work hardens about like 1020 steel, that is not a lot.
>>But they followed this with warnings not to do anything that would
>>work harden it. Possibly more because it will gall and also because
>>it does not conduct heat well. So it sounds as if you can't harden
>>titanium much by work hardening, you need to machine it as if it does
>>work harden.
>>
>> Dan
>
>At one point I did some work on the SR-71's which had titanium skin. I
>have no idea what alloy it was but it seemed similar to stainless
>except that it work hardened even worse. It seemed like if the drill
>slipped for one revolution the stuff became uncutable. We used a lot
>of carbide drill bits in the short time we supported them.
>
>
>Bruce-in-Bangkok
>(correct Address is bpaige125atgmaildotcom)
that is my experience with working a piece. filing it to shape is
just as difficult as drilling btw.
Stealth Pilot
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Posted by pyotr filipivich on May 11, 2008, 9:53 am
Please log in for more thread options I missed the Staff meeting, but the Memos showed that Bruce in Bangkok
+0700 in rec.crafts.metalworking :
>On Sat, 10 May 2008 08:17:16 -0700 (PDT), "dcaster@krl.org"
>
>>
>>> Not that I know of, Dan. Titanium has a reputation for not work-hardening
>>> very much. It's worth checking out, in the machining context, but I'm pretty
>>> sure that's the situation in general.
>>>
>>> Titanium can be miserable to machine -- I remember doing some machining of
>>> it back in the mid-'70s -- but my recollection is that it was more tough and
>>> gummy than hard. But that's pretty far back in memory for me.
>>>
>>> --
>>> Ed Huntress
>>
>>Hmmm. I did a little looking on the internet and found sites that
>>said Titanium work hardens about like 1020 steel, that is not a lot.
>>But they followed this with warnings not to do anything that would
>>work harden it. Possibly more because it will gall and also because
>>it does not conduct heat well. So it sounds as if you can't harden
>>titanium much by work hardening, you need to machine it as if it does
>>work harden.
>>
>> Dan
>
>At one point I did some work on the SR-71's which had titanium skin. I
>have no idea what alloy it was but it seemed similar to stainless
>except that it work hardened even worse. It seemed like if the drill
>slipped for one revolution the stuff became uncutable. We used a lot
>of carbide drill bits in the short time we supported them.
We make skid plates fro the tails of Lear Jets. The reason, so
I'm told, is just that - if they scrap it on the tarmac, it doesn't
_all_ wear off in one fell swoosh.
But they sure do take forever and three shifts to machine.
--
pyotr filipivich
"I had just been through hell and must have looked like death warmed
over walking into the saloon, because when I asked the bartender
whether they served zombies he said, ‘Sure, what'll you have?'"
from I Hear America Swinging by Peter DeVries
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