SKS Prototype stock (update 02-02-2014) post 244

Rallix said:
ABS isn't your only option for 3D printing, Nylon is also available, it's more expensive though.

You can also reinforce printed parts with strips of carbon fiber around stress areas. The main problem will be insulating the plastic from the heat, especially around the chamber, but that can be easily over come.
Insulating the rails around the barrel could be easy as taking thin aluminum plates and attaching them around the inside of the rails spacing them periodically to efficiently absorb and dissipate heat from the barrel.

Another option would be to print it off in PLA and then cast it with aluminum, that'd be fundamentally cheaper than CNC.

Next year SLS printing patents will expire, so 3D printing with metal may become an option for you soon any way. Don't know if you want to wait or hinge your plans on that though.

Great work so far man.
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Ok , will note this , for the moment the measuring and quoting process for the drawing are nearly finished , here a new pic différent style for the one you do not want many rail ,

scope_10.jpg
 
NO major change at 06/08/2013 I modified the end of the upper rail and added a little hole on the upper and lower in case my retaining button dint work like it suppose to be

It seem that the 3D printing will be probably the best solution for making the first prototype , if someone know a 3d printing shop in Edmonton give me her name please ,



upper_10.jpg


assemb13.jpg



It seem for now that it will look like this without the rail , the point of gravity seem to be in the rear with the software but not sure if i can trust it , but i really think that it will be near the middle of the rifle

full_b10.jpg



assemb14.jpg



The Drawing is nearly finished, i dont think i will modify anything else , For the moment i just need to find a job and will be good to afford the first units
 
You should look for a hackerspace or makerspace in the city, it's likely there's one there as most major cities do. I think you'll have to edit your design to work with 3D printing though, as that lower receiver appears to be one piece, and likely too long for most conventional 3D printers, same deal with the upper. You're probably going to want to keep your length around 10-8 inches at most per piece.

Also, be sure to print the pieces cross wise not length wise, you have to remember that 3D printed plastic layers are much like the grain of wood, so you want to situate the direction of the layers to resist the forces applied to it.

Looking at your design I'd say the areas you may experience trouble with are around where the buffer tube connects and possibly the grip, but I will say it looks like quite a thick chunk at the end, so you may be alright.

There's quite a bit more kick to an SKS than an AR15, so I can imagine you'll have that much more to deal with using a 3D printed prototype.

Unless of course you print it in PLA and then just cast the parts in aluminum, that might solve most of your problems right there, and still keep your costs lower than CNCing.
 
Rallix said:
You should look for a hackerspace or makerspace in the city, it's likely there's one there as most major cities do. I think you'll have to edit your design to work with 3D printing though, as that lower receiver appears to be one piece, and likely too long for most conventional 3D printers, same deal with the upper. You're probably going to want to keep your length around 10-8 inches at most per piece.

Also, be sure to print the pieces cross wise not length wise, you have to remember that 3D printed plastic layers are much like the grain of wood, so you want to situate the direction of the layers to resist the forces applied to it.

Looking at your design I'd say the areas you may experience trouble with are around where the buffer tube connects and possibly the grip, but I will say it looks like quite a thick chunk at the end, so you may be alright.

There's quite a bit more kick to an SKS than an AR15, so I can imagine you'll have that much more to deal with using a 3D printed prototype.

Unless of course you print it in PLA and then just cast the parts in aluminum, that might solve most of your problems right there, and still keep your costs lower than CNCing.
Click to expand...


i guys will llook for that , but my first idea was to quet some quote front some industrial shop and maybe 3d print it but in a another material something strong, resistant to shock and heat ,

my stock is liske 25inch long and most printing device are at 20inch im sure i will find the good place when i be ready
 
Dad003 said:
i guys will llook for that , but my first idea was to quet some quote front some industrial shop and maybe 3d print it but in a another material something strong, resistant to shock and heat ,

my stock is liske 25inch long and most printing device are at 20inch im sure i will find the good place when i be ready
Click to expand...

In that case, why not shapeways.com? You're not printing a gun, so there shouldn't be an issue with them as far as I'm aware. They do international delivery and they have multiple materials from which you can choose from, also the design is kept private.

They're expensive, but if you can't get it locally you have a backup at least.
 
Rallix said:
In that case, why not shapeways.com? You're not printing a gun, so there shouldn't be an issue with them as far as I'm aware. They do international delivery and they have multiple materials from which you can choose from, also the design is kept private.

They're expensive, but if you can't get it locally you have a backup at least.
Click to expand...

thank for that link i put it in my favorite if you know some other place say it i will be able to look a many place to have the best thing as possible
 
Dad003 said:
thank for that link i put it in my favorite if you know some other place say it i will be able to look a many place to have the best thing as possible
Click to expand...

These are all the online 3D printing and rapid prototyping services I know of...

kraftwurx.com
solidconcepts.com/rapid-prototyping/
sculpteo.com/en/
quickparts.com
ponoko.com
materialise-onsite.com/en
 
I finally got one quotes but not sure if the 3d printing in SLS is the best seem really expensive and they must do the bigger part in 2 piece

In Nylon Glass filled it near 1200$ i have requested some quote at other place and for other material

at this price i may have to rellook for a CNC simulation on my computer at least will have a better product for the same price
 
it not suppose to be a problem if you do the ejection port mod , and i think that a sks without the mod will work good in too , i have added a shell deflector in the upper rail for that

port_b10.jpg
 
thank i didn't see your first post ^^ , I'm looking to get more quotes , maybe in the cheap abs for the first , cheaper as possible for the first one , i dont have 1200-1500$ at this time to spend on this , and for a plastic one at this price will be in machined aluminum

after some thinking to cut the cost as possible i think that what it very expansive for the base/ lower is the need or support materiel , so i think that i will redraw the thing keeping the same look but adding a removable handguard, that will created the possibility to draw more model for future product short /long or new look , but doing that mean i have probably to rethink the upper rail too


with out modifying anything in strong ABS it cost 750$
 
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