Titanium
Ive been looking through old home build post and looking around alot regarding doing a home build but using titanium for the frame. So what im asking is this achiveable? to all the home builders out there what were the problems that u came across and how you got around them?
The money is not really an issue (to a degree).
My aim is to build it for myself as a one off and of course show you guys what happens :).
many thanks for the input.
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should that be read:
Some day I will build [a] complete frame.
or
Some day I will build complete frame[s].
?
7075 is stronger but I don’t think it’s needed and worth the money. The problem is the way the frame is cut up. I have a Logun S-16 and it uses a tube frame and has no issues. It only has small openings cut here and there.
Don’t know how much 7075 tubing is but I bought a 2.125″x18″ bar for making caps for my small chambers and it was $82.00. The same piece of 6061 would have been under $15.00.
Some day I will build complete frame. Will be 6061 1.5″ OD X .1875″ thick.
I forgot to mention, that using Ti. would double the weight, and be a real pain to work.
Yep, your right, Dyo. But 6061 is a lower grade than 7075, It is both softer, weaker, and less elastic than 7075. Futher it is unable to take a T-6 heat treat fully. This, and the fact that 6065 is less expensive, is why Hoyt Easton makes their entry level, (read budget) hunting arrows of the stuff. Its Cheap. But it won’t stand up for competition. 7075 will. 😉
Compared to 7075, it is dead soft, and when it bends, it cannot be straightened with out damage.
I’ll look into it thanks. Does look like I’m heading down the ally route get as much detail and info before I start.
Strong is not the same as stiff. Ti tends to be very strong for its weight but it likes to flex. It also has some neat thermal traits and is quite resistant to corrosion and also has a long fatigue life. All could be very handy for aircraft.
Edit, Just a thought if your after stiff and are happy to spend you could always look at 2025. Its a bit harder to work and you are best to get a specialist to hard coat it after. But its a fair bit stiffer then 6061 or 7075 for a given weight.
Great advice people love it, so y do they use ti in aerospace for strength?
There is nothing wrong with 6061. The problem with the frame is the scope rail is to thin and the big cut out. If they made the scope rail 3 time as thick it would help a lot. Also make it a side cocker and run another support down where the slot is now.
If I’m not mistaken, the AF frame IS 6061 Alu.
that, and T6 isn’t a grade of Alu. T-6 is a heat treat for some types of Alu.
For a stiffer frame, I would use 7075 Alu, with a T-6 HeatTreat. It is much stronger, and harder than any grade of 6061
As far as Ti machining like an Alloy, Ti IS an alloy. Just as 6061, and 7075 are both alloys. Any metal, with more than one element is it, is concidered an alloy. Most metals are alloys. Except a few rare metal heavy metals. and of course-24K Gold.
7075-T-6 machines very well using
C-6 and micro grain carbide tooling.
Mike
Titanium in the same dimensions as steel and aluminum is more flexible… 😕
It is also a pita to work with and expensive.
Use aluminum and DESIGN it to prevent flex (see post above). The AF frame flexes because it was not designed well at the loading port area (where the big gap is), plus the collar area is like a giant hinge.
The use of Ti in bicycle frames was to provide a softer ride than aluminum with a stronger than steel material. Ti can be stressed over and over without cracking like steel and aluminum.
Just use 6061 tubing. It is lighter then titanium.
Build a trigger guard the holds the trigger piece the bolts on. Same with scope mount. Then only cut out one side of the frame for loading.
Basically like a Logun S-16.
Ironically titanium alloys though normally very strong for there weight tend to have low modulus stiffness. A good quality aluminum such as a standard aircraft grade T6 alloy is likely a better option for what you are doing. For a given stiffness the alloy will build a lighter frame and be much easier to work with than titanium.
If you wish to do something a bit more extravagant carbon reenforced plastic would be the way forward. It would make a much stiffer frame for a given weight.
Great thanks for that I want to use ti coz I want to get rid of the frame flex, make it a side cocker.
titanium is available in many grades. The Ti that’s intended for milling is a bit like alloy in that it tend to bur up. Once you get the hang of it there is no real issue with machining it. Its a pain in the ass to weld though. This link may help you http://americanmachinist.com/features/cool-tips-cutting-titanium
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How about a carbon- CAAM-MMMF tube? Would that be strong enough to attach the trigger block to, how would you go about putting the bottle coller on?