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Posted: 2/4/2016 3:07:59 PM EDT
| Got the standard 22 kit from dm (fluted). I have a guy that will turn it down for me for free. I think that would save some weight. is 1.125" safe enough (it's 1.25" now). This is 22lr only project, I have a spectre II for the other small calibers. Anything else I can do to lighten it up? |
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Quoted:
Got the standard 22 kit from dm (fluted). I have a guy that will turn it down for me for free. I think that would save some weight. is 1.125" safe enough (it's 1.25" now). This is 22lr only project, I have a spectre II for the other small calibers. Anything else I can do to lighten it up? Another member ordered the same kit from DM but turned down to 1.125" also. It was working out good for him so far. |
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I was going to do this but decided not to. I posted this over on the form 1 boards but never got any feedback.. The guy that has done this successfully might be running it on a rifle(lower pressure), or my temp assumptions are off, or I am totally off...
Well I have been doing some research to see if a 6061 Aluminum tube with 1.125" OD and .0625" wall will handle the pressures of a 22lr. Unless I am missing something, it looks like it might not be a good idea. How I arrived at this is listed below. Some assumptions were made, Let me know if I am off base. Assumptions: 1,800psi - 22lr muzzle pressure for pistol (Gun Digest Book of Suppressors, Patrick Sweeney, pg250) 400F - this is just a guess, could not find any info on this. 14,900psi - yield strength of 6061 @ 400F (www.matweb.com/search/datasheet_print.aspx?matguid=1b8c06d0ca7c456694c7777d9e10be5b) Calculating Hoop stress: (www.engineersedge.com/calculators/hoop-stress.htm) for 1.25 x .125 tube @ 1800psi ---> 8,100 ppsi hoop stress for 1.125 x .0625 tube @ 18000psi ---> 15,185 psi hoop stress Calculating safety factor: for 1.25 x .125 tube 14,900 / 8,100 = 1.8 for 1.125 x .0625 tube 14,900 / 15,185 = .98 I have read that the recommended factor of safety for suppressors should be 2 (www.sadefensejournal.com/wp/?p=573). The 1.25 x.125 6061 Al tube is just under that at 400F. It looks like the 1.125 tube would be yielding around 400F @ the assumed pressure. |
| Thank you for the feedback. I went ahead with the turn down. We ended up stopping at 1.14 or so. Was getting close to the spanner holes in the end caps. It seems so much thinner and definitely lighter (damn me I didn't get a weight on it before, I'll assemble the parts and post the overall weight). I am thinking of using a VSR for the initial Blast baffle and even possibly grooving the end cap so it absorbs as much of that as possible. Time will tell, I'll post any results as I get closer to the final build, still need to drill, anodize, coat, engrave, etc... |
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