What's the minimum safe wall thickness, this will not be welded.
I am making 416 ss 60deg clipped baffles and end caps -w- TI spacers and outer tube.
Shopping for tube materials now, I have 1.5" 416 rod for the baffles.
Haven't turned ti yet but have read up on it till my eyes bleed!
Form 1 30cal TI tube thickness?
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Re: Form 1 30cal TI tube thickness?
There are likely other posts that answer the question of wall thickness
but....
Wall thickness depends on pressure inside of the suppressor which varies dramatically from one cartridge to another and varies with barrel length and other factors.
300 blackout subsonic will have lower pressures than say a 300 win mag.
Wall thickness will vary with actual tube material. What grade Titanium is the tube?
but....
Wall thickness depends on pressure inside of the suppressor which varies dramatically from one cartridge to another and varies with barrel length and other factors.
300 blackout subsonic will have lower pressures than say a 300 win mag.
Wall thickness will vary with actual tube material. What grade Titanium is the tube?
Re: Form 1 30cal TI tube thickness?
I used .070" wall tube and 24 pitch threads for the end cap.
( Rifle length 16' barrel / .30 caliber can Grade 9 tube )
( Rifle length 16' barrel / .30 caliber can Grade 9 tube )
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Re: Form 1 30cal TI tube thickness?
cal50 wrote:I used .070" wall tube and 24 pitch threads for the end cap.
( Rifle length 16' barrel / .30 caliber can Grade 9 tube )
Spacers or welded?
The answer I was looking for, Thanks.
At this time the highest pressure will be a .308 20+ inch barrel.
Re: Form 1 30cal TI tube thickness?
Branded for life, in more ways than one
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Re: Form 1 30cal TI tube thickness?
A turned id .070-.080 tube threaded 24-28 tpi end caps -.005 with Pressed baffles,spacers,-.003.highest pressure will be a .308 20+ inch barrel.(Slow fire)
Using a coolent will help 10X w/ titanium.
The only reason after 243 years the government now wants to disarm you is they intend to do something you would shoot them for!
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895
Re: Form 1 30cal TI tube thickness?
I used .060" Ti in mine, source was the Diversified Machine solvent tube at 1.500" OD 1.380" ID that had 24tpi ends, with a SS monocore it was 15.0oz at 9" long.fastfire wrote:What's the minimum safe wall thickness, this will not be welded.
I am making 416 ss 60deg clipped baffles and end caps -w- TI spacers and outer tube.
Shopping for tube materials now, I have 1.5" 416 rod for the baffles.
Haven't turned ti yet but have read up on it till my eyes bleed!
pic host
Re: Form 1 30cal TI tube thickness?
c5_nc wrote:I used .060" Ti in mine, source was the Diversified Machine solvent tube at 1.500" OD 1.380" ID that had 24tpi ends, with a SS monocore it was 15.0oz at 9" long.fastfire wrote:What's the minimum safe wall thickness, this will not be welded.
I am making 416 ss 60deg clipped baffles and end caps -w- TI spacers and outer tube.
Shopping for tube materials now, I have 1.5" 416 rod for the baffles.
Haven't turned ti yet but have read up on it till my eyes bleed!
pic host
Nice!!! Do you have pictures of the monocore? We'd like to see that please.
Thanks
Re: Form 1 30cal TI tube thickness?
I take the tube thickness at the thread relief of the tube as my minimum thickness. Approximate the pressure in the blast chamber by using Boyle's law:
P1 is peak chamber pressure, V1 is case volume (these can be had for your cartridge from wikipedia typically). V2 is the volume of the barrel AND blast chamber, where P2 is unknown. Solve for P2.
Then use thin-walled hoop stress equation to find stress in the tube at the blast chamber:
You need to know the yield strength of your tube material and take some safety margin (I used 0.6 x yield at 100F) to make up for unknowns/assumptions and decrease in material strength at higher temps. IIRC, I arrived at 0.6 x yield because a) that is the criteria for ASME B&PVC allowable stress (tresca criterion) and b) Chro-moly material properties dont decrease THAT much at high temps and using 0.6 x "room temp" yield would still result in a strong enough part.
NOTE: TAKE ALL OF THIS WITH A HUGE GRAIN OF SALT. YOU ARE GETTING INFO ON PRESSURE VESSEL DESIGN FROM SOME RANDOM GUY ON THE INTERWEBS. USE AT YOUR OWN RISK.
P1 is peak chamber pressure, V1 is case volume (these can be had for your cartridge from wikipedia typically). V2 is the volume of the barrel AND blast chamber, where P2 is unknown. Solve for P2.
Then use thin-walled hoop stress equation to find stress in the tube at the blast chamber:
You need to know the yield strength of your tube material and take some safety margin (I used 0.6 x yield at 100F) to make up for unknowns/assumptions and decrease in material strength at higher temps. IIRC, I arrived at 0.6 x yield because a) that is the criteria for ASME B&PVC allowable stress (tresca criterion) and b) Chro-moly material properties dont decrease THAT much at high temps and using 0.6 x "room temp" yield would still result in a strong enough part.
NOTE: TAKE ALL OF THIS WITH A HUGE GRAIN OF SALT. YOU ARE GETTING INFO ON PRESSURE VESSEL DESIGN FROM SOME RANDOM GUY ON THE INTERWEBS. USE AT YOUR OWN RISK.
Re: Form 1 30cal TI tube thickness?
Also, if you have quickload that would be a much more accurate method of determining pressure at the muzzle for a given cartridge/load. It takes into account factors that the (relatively simple) boyle's law doesnt.
Re: Form 1 30cal TI tube thickness?
Does not apply to the tube I posted, but one of the solvent trap companies is producing Ti tubes marketed for form 1 conversions, They are running a course thread into .065" thick Grade 9 Ti. Also they are threading .65" into the tube for use with a .42" endcap, so .23" of threads are exposed on both ends of the tube in the blast chamber, and the wall thickness here is .026". No one has reported a failure yet and there appear to be a lot out there. Someone had ran a Hoop stress (?) calculation and said it passed with a safety margin of 1.speed6 wrote:Also, if you have quickload that would be a much more accurate method of determining pressure at the muzzle for a given cartridge/load. It takes into account factors that the (relatively simple) boyle's law doesnt.