The AK- SKS kit ( little update post 440 2015-03-19)( less ABS more wood and metal)
- Thread starter Dad003
- Start date
AlbertaSheepdog
Regular
- Location
- Western Canada
I just AK'd in my pants.
nice work
nice work
mildcustom2
CGN Ultra frequent flyer
- Location
- Surrey, B.C.
I will try and snap a pic of my ironwood Russian Red Stock Set for you. It's absolutely gorgeous.
- Location
- East of Home, West of the Rest
with the metal magazine , still without the mag release , but didnt got time this evening to work much on this ,
Fantastic! Exactly what I was talking about!!!
i still have to work on the mag release that the missing parts in that picture
- Location
- East ontario
good to see you working on this, are you planning to machine or cast the metal parts when finished, there are some world class casting companys in Canada.
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a few parts could be casted , but in the 5 non metal sheet part , at least 3 requiert to be machined , casting sometime is not nice , to have machined a few casting parts they werent that good ,
might be just more cheaper and faster to machine it from a bloc of aluminum , still have a few detail to change mods, reprint a model and if it good , i will start the process of quettings quotes
my plan is still to get 3 model first to try and eventually maybe have to change or made better if needed
i might get some new about the timbersmith stock next week and if not get a refund and simply just order another stock from ironwood design ,
might be just more cheaper and faster to machine it from a bloc of aluminum , still have a few detail to change mods, reprint a model and if it good , i will start the process of quettings quotes
my plan is still to get 3 model first to try and eventually maybe have to change or made better if needed
i might get some new about the timbersmith stock next week and if not get a refund and simply just order another stock from ironwood design ,
Considering how durable the 3D printed parts have been thus far, wouldn't it be reasonable to injection mold some of those parts? Injection molded parts are also much stronger than 3D printed ones, and nylon for example would be ideal for the task, it's a lot more rigid when injected rather than printed from my understanding.
You could save a lot of money and effort with injection molded parts.
Unless you expect them to be exposed to significant temperatures.
For the pistol grip adapter, you could injection mold it with a metal threaded insert, that way stripping wouldn't be much of an issue as far as the screw is concerned, and you could also have a piece of sheet metal going through the midsection along the y axis if bending forces are an issue.
You could greatly reduce costs and production time for that small item in which case.
The same might be said of the trunnion, if we analyze the forces acting on the trunnion, it'd be possible to come up with a composite design offering the advantages of full metal where needed and the cost effectiveness of the injection molded where applicable.
The frame and cover should definitely be sheet metal though, as the advantage would be lost, since small injection molded parts are vastly cheaper and more effective to produce than larger ones.
I don't think casting would be a very good idea for the trunnion or pistol grip though, cast parts are very rigid, and wouldn't withstand the fatigue as well as something machined or forged. But forging would be expensive to say the least.
Machining out of aluminum is still very viable as you well know, but considering how well it has performed thus far with only 3D printed ABS, it shows just how viable the combination of inserts and injection molding could be, especially considering that these parts were printed at a high layer height, 0.4mm right?
Plastic strength is almost entirely dependent on layer adhesion, with layers that high the parts are significantly weaker than something at 0.1 for example.
This wouldn't be an issue for injection molded parts however.
If you can average the forces acting on the trunnion, you should be able to use inventor to give you a rough idea of what the stresses should be like, just be sure to rationalize the fixed points properly or it won't give you meaningful results. After which you can change the design and play with various materials and their properties to see roughly how much a part may or may not deform under given stresses and work a new design based off these findings.
Another advantage to the composite design is the amount of money you're potentially saving in the quality control process, a failed composite part is going to be a small loss compared to a fully machined piece with a single problem potentially ruining the part. The fact that simpler metal parts can be combined with the more complex geometry of the cheaper plastic also enhances the QC cost reduction, or you could keep costs similar and increase the quality of the individual parts, though I don't think that's necessary for this design.
Mind you, it's not like you couldn't do the same thing with metal, break the part into less complex individual elements and what not, but the advantage wouldn't be as great as it'd be combined with the cheaper material.
I'd come at it from the idea that you want to keep the original dimensions and geometry and see what can be done to augment it accordingly.
At least for this stage of the game, a more comprehensive re-design could be pursued once you have resources in place to work with; your greatest advantage here is that you've got a very rugged base design, with a lot of room to grow and innovate down the line.
You could greatly reduce costs and production time for that small item in which case.
The same might be said of the trunnion, if we analyze the forces acting on the trunnion, it'd be possible to come up with a composite design offering the advantages of full metal where needed and the cost effectiveness of the injection molded where applicable.
The frame and cover should definitely be sheet metal though, as the advantage would be lost, since small injection molded parts are vastly cheaper and more effective to produce than larger ones.
I don't think casting would be a very good idea for the trunnion or pistol grip though, cast parts are very rigid, and wouldn't withstand the fatigue as well as something machined or forged. But forging would be expensive to say the least.
Machining out of aluminum is still very viable as you well know, but considering how well it has performed thus far with only 3D printed ABS, it shows just how viable the combination of inserts and injection molding could be, especially considering that these parts were printed at a high layer height, 0.4mm right?
Plastic strength is almost entirely dependent on layer adhesion, with layers that high the parts are significantly weaker than something at 0.1 for example.
This wouldn't be an issue for injection molded parts however.
If you can average the forces acting on the trunnion, you should be able to use inventor to give you a rough idea of what the stresses should be like, just be sure to rationalize the fixed points properly or it won't give you meaningful results. After which you can change the design and play with various materials and their properties to see roughly how much a part may or may not deform under given stresses and work a new design based off these findings.
Another advantage to the composite design is the amount of money you're potentially saving in the quality control process, a failed composite part is going to be a small loss compared to a fully machined piece with a single problem potentially ruining the part. The fact that simpler metal parts can be combined with the more complex geometry of the cheaper plastic also enhances the QC cost reduction, or you could keep costs similar and increase the quality of the individual parts, though I don't think that's necessary for this design.
Mind you, it's not like you couldn't do the same thing with metal, break the part into less complex individual elements and what not, but the advantage wouldn't be as great as it'd be combined with the cheaper material.
I'd come at it from the idea that you want to keep the original dimensions and geometry and see what can be done to augment it accordingly.
At least for this stage of the game, a more comprehensive re-design could be pursued once you have resources in place to work with; your greatest advantage here is that you've got a very rugged base design, with a lot of room to grow and innovate down the line.
still dont have the mag release in this picture , i have to reprint the frame thicker to be able to install it , not perfectly happy with the results with the finishing of my stock the stain was suppose to be more a grey and it look like more grey/blue on some spot , might retry when i got more time to redo a better job ,
this week-end i printed a new frame , with some light adjustment and a little change in the look , it will probably be the same in the final version , added mag release , still need some adjustment on it , a little bit too long at this moment , added a hole in the handgaurd adapter for the cleaning rod , because that look a little bit weird without it ^^, i have to source an ak buttpad or just print one , i will be good to lower the dust cover of maybe a .030 i think
weell didnt work on it this week , i tried to print a new dust cover with osme adjustment and an upgrade in case a trouble appear , but didnt took the quotes right so the parts has no fitting .... 15 hour for nothing at the end ,
still have to work on the printer , new base to mount the hotend that should helps to make better prints , might be able to test shoot this week-end
still have to work on the printer , new base to mount the hotend that should helps to make better prints , might be able to test shoot this week-end
