NZVarminter, so you can consider myself one uninformed person!!! You didn't come with no valid information in your statement, nothing that proves sintered powder is stronger than machined alloys. What I am doing with this action is a test as well and see its potential. Oh... I remember one day you let me shot your 20BR in a bench besides me. Cool rig!
My 3D printed receiver
- Thread starter MFG_BOP
- Start date
Ti does not tolerate bursts of high heat.
BTW, are you, MFG_BOP the same person who years ago wanted to import R-700 clones in 80% condition and without serial numbers?
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inclinação fechar, canal de fechamento, cam armar, rampa de armar, canal de acasalamento, estrada para o inferno,
jajaja,kkkkk,rsrsrs
Please excuse my lame attempts to use translation software. Obviously I know nothing about Portuguese.
Your 15-5 PH alloy is very close to 17-4 PH. I have worked a lot with the various stainless steels used to make the surgical instruments for orthopedic surgeons. This included material selection for new designs, design of instruments and analysis of failed instruments returned on complaints by surgeons and hospitals.
I like to joke about 17-4 PH being what I call "Gall-O-Matic." When very clean and running against itself it is about the worst galling materials you can find.
This is a pretty bad characteristic for a surgical instrument that is NOT permitted to be lubricated due to sterility and bio-compatibility issues.
You have more choices with a firearm. It is easily accommodated for a firearm if you can lubricate it well, run it against a different alloy such as Nitronic 60 or use the material with each part of a couple heat treated to different hardnesses.
Surgical instruments only permit mixing the alloys, fits, surface textures and varying hardness.
This is why you may find a stainless steel receiver and a stainless bolt body using carbon steel locking lugs where there is a multiple piece bolt. Carbon steels will resist galling.
About a day to review the literature will permit some minor adjustments of the materials and design used to help you prevent galling early on.
Considering that you have something that looks like a 40X receiver I would expect that the bolt locking lug surfaces and the threads for the bolt sleeve are the only 2 areas that might need attention to prevent galling if your printed finish can equal the machined finish. A carbon steel factory bolt sleeve would resist galling if the mating threads in the bolt body are machined to at least a 32Ra. All of the threads may need to be machined in the conventional manner to provide a better surface texture than the printing process provides. One of the processes used with surgical instruments is electro polishing. This improves the surface texture.
To get the action straight after printing and precipitation hardening it may need blue printing the receiver threads and the through hole for the bolt. I have no idea if the firing pin and main spring will work long term in the interior of the bolt so that area will need some monitoring if you print your bolts too.
https://www.nickelinstitute.org/~/M...lingCharacteristicsofStainlessSteel_9006_.pdf
jajaja,kkkkk,rsrsrs
Please excuse my lame attempts to use translation software. Obviously I know nothing about Portuguese.
Your 15-5 PH alloy is very close to 17-4 PH. I have worked a lot with the various stainless steels used to make the surgical instruments for orthopedic surgeons. This included material selection for new designs, design of instruments and analysis of failed instruments returned on complaints by surgeons and hospitals.
I like to joke about 17-4 PH being what I call "Gall-O-Matic." When very clean and running against itself it is about the worst galling materials you can find.
This is a pretty bad characteristic for a surgical instrument that is NOT permitted to be lubricated due to sterility and bio-compatibility issues.
You have more choices with a firearm. It is easily accommodated for a firearm if you can lubricate it well, run it against a different alloy such as Nitronic 60 or use the material with each part of a couple heat treated to different hardnesses.
Surgical instruments only permit mixing the alloys, fits, surface textures and varying hardness.
This is why you may find a stainless steel receiver and a stainless bolt body using carbon steel locking lugs where there is a multiple piece bolt. Carbon steels will resist galling.
About a day to review the literature will permit some minor adjustments of the materials and design used to help you prevent galling early on.
Considering that you have something that looks like a 40X receiver I would expect that the bolt locking lug surfaces and the threads for the bolt sleeve are the only 2 areas that might need attention to prevent galling if your printed finish can equal the machined finish. A carbon steel factory bolt sleeve would resist galling if the mating threads in the bolt body are machined to at least a 32Ra. All of the threads may need to be machined in the conventional manner to provide a better surface texture than the printing process provides. One of the processes used with surgical instruments is electro polishing. This improves the surface texture.
To get the action straight after printing and precipitation hardening it may need blue printing the receiver threads and the through hole for the bolt. I have no idea if the firing pin and main spring will work long term in the interior of the bolt so that area will need some monitoring if you print your bolts too.
https://www.nickelinstitute.org/~/M...lingCharacteristicsofStainlessSteel_9006_.pdf
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hey guys. long time no post. the attached images show the hardened action (43 HRC) and two reamers i designed, based on the manson reamers, to open up the bolt ways manually with a tap wrench. my boss will give me a hand and make the steel bushing to help center the reamer in the hole. hope that works. will post a couple more images after the work is done.
threads have also been cleaned up with a m4 tap.
threads have also been cleaned up with a m4 tap.
I have not read this long thread all the way through but there are 3D printers that build houses from cement.
Alex Wheeler
Site $$ Sponsor
Thats a closing cam.
Appears that technology is more advanced than I realized. Thanks for the info.
I was able to open up the boltways with the reamer today. gosh... took A LOT of time and muscle. maybe we took about 2 hr. It means the printed bore was not straight (or tapered?). You can see the bushing being made, reaming operation as well as the final result. I couldn't take better pictures with my chinese mobile so I hope I can post better pics in the future with a proper camera. I didn't get the best finish in the world, but with a little sanding it will shine. The boltway (.698") is .001" larger than the bolt, exactly how I wanted.
Cheers!
Cheers!
I like it!!
That's excellent work - We need these pioneers to keep pushing the boundaries. It takes an enormous amount of commitment to drive a project like this forward.
Sure, the results aren't perfect - YET. But make no mistake, this is the future.
It doesn't seem that long ago when a cell phone was the size of a brick. I worked with compute/radar operated by a punch card system, when dot-matrix printers took over from teletype. The first basic electronic calculators ran on a 9v battery and cost an arm and a leg. Compare a 5 1/4 floppy disc to a mini SD card etc.
This is really just the opening rounds of this technology - resolution will quickly get much finer, new materials will be developed.
What about composite materials, how about carbon fibre and stainless steel, not only in layers like plywood but diagonally interlaced too. Light, springy, ridged - design it how you want, change the design with a few click of a mouse. Designs that you couldn't possibly machine with conventional methods.
I think, in twenty years this technology will be standard for many manufacturing processes.
Sure, the results aren't perfect - YET. But make no mistake, this is the future.
It doesn't seem that long ago when a cell phone was the size of a brick. I worked with compute/radar operated by a punch card system, when dot-matrix printers took over from teletype. The first basic electronic calculators ran on a 9v battery and cost an arm and a leg. Compare a 5 1/4 floppy disc to a mini SD card etc.
This is really just the opening rounds of this technology - resolution will quickly get much finer, new materials will be developed.
What about composite materials, how about carbon fibre and stainless steel, not only in layers like plywood but diagonally interlaced too. Light, springy, ridged - design it how you want, change the design with a few click of a mouse. Designs that you couldn't possibly machine with conventional methods.
I think, in twenty years this technology will be standard for many manufacturing processes.
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