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#1 SorrowX

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Posted 03 February 2011 - 10:14 PM

RPM-Built Nerf Blaster

Proving myself and others wrong

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Introduction: Since I started nerfing, the idea of a viable nerf blaster being built by a Rapid Prototype Machine has been put down. I tried before, but never seemed to get the project off the ground. After that, I jumped on the wagon that it couldn’t be done. Recently, a friend of mine managed to push me off of that wagon and get started again. Needless to say, my project was a success. Of course, not everything in the blaster was made using an RPM, but the majority of the hard to manufacture parts are. The only things not made using the RPM are the cylinder, piston rod, and barrel for obvious reasons. In other words, the plunger tube, plunger rod, and barrel still come from elsewhere. I understand the people like boltsniper have made components such as magazine wells for his blasters, but I wanted to take it a step or two above by actually making crucial components from an RPM. Anyways, on to the meaty goodness.


RPM Talk: For this project, I used Autodesk Inventor 2011 and Catalyst to design and process my blaster. The machine used is a Dimension SST768 and the model material is P400 ABS. I used a sodium hydroxide/water solution in a specialized bath set at 70°C to remove the soluble support material as well as to somewhat strengthen the bond of the model material. All of the parts built used a solid material setting for maximum strength and longevity.


Design: The blaster was mainly designed as a proof-of-concept build, so almost anything can be changed design-wise. I designed it to use 1-˝ PVC as the plunger tube. The plunger rod is ⅝ round Nylon rod, but that can be easily swapped for square rod with small changes in the design of the catch base, catch and plunger head. I chose to make use of the many tools available at my school, so I used a rounded catch face design and a lathe to carve the catch face itself. This can easily be substituted for a nitefinder-style catch system.


Strength: I have yet to range test it, but that’s not really a big concern for me. My main concern is for how long it will last. So far, the parts has withstood many hours of dry-firing without any padding of any sort, any there is still no sign on any physical damage. I am currently using what my friend tells me is plus-bow spring to power the main mechanism. Half of these springs plus a normal LS spring pushes longshots to around 100’.


Pictures: Well, this part is pretty self-explanatory.

Stripped:
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Printed parts only:
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Grip:
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Trigger:
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Grip AND Trigger:
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Catch:
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Catch inside catch base:
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Piston head:
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Cylinder Head:
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Primed:
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Notes: If anyone wants the designs or files, I can send it to them via email, just PM me. You guys are welcome to the knowledge. To be honest, my designs aren’t the greatest, and some do have trouble understanding them. If those who request the files are willing to wait a short while, I can make revisions of my designs that are much clearer and easier for everyone to understand.


Video Is Up!!!

Files are up!!! http://www.mediafire...l99ncxy0e3d0nua

Edited by SorrowX, 16 February 2011 - 11:31 PM.

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#2 louiec3

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Posted 03 February 2011 - 10:17 PM

That's really cool. I only wonder about the durability of the printed parts. Other than that I feel like I want to bug my engineering teacher to let me use my schools rapid prototyper.
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#3 WicketTheModder619

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Posted 03 February 2011 - 10:22 PM

That's awesome! I need to bug me teacher too louie.
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#4 SorrowX

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Posted 03 February 2011 - 10:27 PM

Ohh, what kinds of RPMs do your schools have? I should have the files edited and ready by Tuesday at the latest. If you guys decide to make one using my designs, feel free to post the pictures here.

The durability of the printed parts is very good. Nothing feels like its going to snap, and have withstood hours of dry-firing without any padding so far.

Edited by SorrowX, 03 February 2011 - 10:31 PM.

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#5 thedom21

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Posted 03 February 2011 - 10:31 PM

That is SWEET! I will also have to bug my teacher!
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#6 utahnerf

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Posted 03 February 2011 - 10:36 PM

Sick dude. Just sick. If it ends up being durable like a regular brand name blaster, there can be endless possibilities. Hooray for advancement!!

P.S., nice job.

Edit: I'm damn excited. OMGOMGOMGOMGOMGOMGOMGOMGOMGOMGOMGOMGOMG. This is AWESOMESAUCE. No, this is AWESOMER-SAUCE. There, I'm done for now. Oh, and can you post the file please? I would like to bring it to my engineering teacher too, an see if she will let me use it. Anyways, THANK YOU.

Edited by utahnerf, 03 February 2011 - 10:41 PM.

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#7 Y-Brik

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Posted 03 February 2011 - 10:57 PM

Excellent work, I may just have to ask you for those Inventor files (The handle, trigger, catch, and rear endcap in particular)
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As I said I have not not alot of testes yet but I will be once I finish the mod.

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#8 WicketTheModder619

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Posted 03 February 2011 - 10:59 PM

Yeah, I would like the files too, I won't have my engineering class until monday though, so no rush. 2 hour delay, a curse and a blessing.
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#9 SorrowX

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Posted 03 February 2011 - 11:01 PM

Excellent work, I may just have to ask you for those Inventor files (The handle, trigger, catch, and rear endcap in particular)

I will have the zip file up soon, and it will include ALL of the parts, ready for inventor, solidworks, catalyst, etc.
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#10 Strikemod

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Posted 03 February 2011 - 11:50 PM

A bit random of a question, but what texture or feel does this have? It looked as if the thing was sort of made of pumice (dumb monitor) but who am I to judge?
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#11 SorrowX

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Posted 04 February 2011 - 12:20 AM

it depends on the RPM i would assume, but mine feel kind of like those 'holographic' pokemon/baseball cards.
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#12 Talio

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Posted 04 February 2011 - 01:06 PM

Why did I just watch a video of you talking? I wanted to see the gun shoot. False advertising!
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#13 SorrowX

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Posted 04 February 2011 - 02:15 PM

Why did I just watch a video of you talking? I wanted to see the gun shoot. False advertising!

It was in the very beggining.
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#14 Hipponater

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Posted 05 February 2011 - 12:46 PM

This is awesome, thanks for providing the files you used. Though I must question your acid bath consisting of Sodium Hydroxide...

If you don't mind, how much did it cost to print?

I'll definitely be looking to make one of this, my friend has access to a 'Stratasys Rapid Prototyper', hopefully we can churn out one of these awesome blasters.
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#15 Doom

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Posted 05 February 2011 - 01:12 PM

Great work. I don't think anyone said this was impossible or even unlikely. However, I recall people thought it would be impractical, as I still do.

I'll reiterate what Hipponator requested: About how much did all of these parts cost?

I gave up on fused deposition modeling (the RP technique you seem to have used) because it cost about $15 per cubic inch where I did it in the past. That's too expensive for me unless it's a part that is too difficult to machine.

Edited by Doom, 05 February 2011 - 01:18 PM.

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#16 SorrowX

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Posted 06 February 2011 - 02:56 AM

This is awesome, thanks for providing the files you used. Though I must question your acid bath consisting of Sodium Hydroxide...

If you don't mind, how much did it cost to print?

I'll definitely be looking to make one of this, my friend has access to a 'Stratasys Rapid Prototyper', hopefully we can churn out one of these awesome blasters.


I'm pretty sure it was sodium hydroxide... It was completely free for me, as my school is awesome. and stratasys makes catalyst, so it's almost guaranteed it would work.
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#17 KaneTheMediocre

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Posted 06 February 2011 - 11:14 AM

RPM Talk: For this project, I used Autodesk Inventor 2011 and Catalyst to design and process my blaster. The machine used is a Dimension SST768 and the model material is P400 ABS. For an acid bath, I used a standard sodium hydroxide/water solution set at 70°C to remove the soluble support material as well as to somewhat strengthen the bond of the model material. All of the parts built used a solid material setting for maximum strength and longevity.


It may have been sodium hydroxide and it may have worked, but in that case you had a base bath. I admit I don't know anything about ABS chemistry in particular.

Edited by KaneTheMediocre, 06 February 2011 - 11:20 AM.

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#18 SorrowX

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Posted 07 February 2011 - 01:38 AM

my talk


It may have been sodium hydroxide and it may have worked, but in that case you had a base bath. I admit I don't know anything about ABS chemistry in particular.


i got this from following a few links on wikipedia, and it sums up what i have access to:

A "water-soluble" material can be used for making temporary supports while manufacturing is in progress, this soluble support material is quickly dissolved with specialized mechanical agitation equipment utilizing a precisely heated sodium hydroxide solution.


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#19 SorrowX

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Posted 16 February 2011 - 11:30 PM

WooHoo! More printed goodies! Ok, here I have a printed turret assembly(THAT WORKS!), as well as a printed Wye and dart door for the ever popular hopper clip. On another note, i have a vertical foregrip and a crutch stock added for ergonomics.

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I'm also working on a new homemade, a printed N-TS, although its not done yet.
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also, i apologize for the double post.
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#20 KaneTheMediocre

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Posted 16 February 2011 - 11:44 PM

WooHoo! More printed goodies! Ok, here I have a printed turret assembly(THAT WORKS!), as well as a printed Wye and dart door for the ever popular hopper clip. On another note, i have a vertical foregrip and a crutch stock added for ergonomics.


TBH, this seemed like a pointless exercise before, as I didn't think producing nerf gun parts from a rapid prototyping device was a concept that needed proving. It's good you're starting to make a more complex blaster to take advantage of the capabilities offered by those machines. If you continue to have free or cheap access to it, you really can build damn near anything you want.
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#21 Blue

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Posted 17 February 2011 - 02:08 AM

WooHoo! More printed goodies! Ok, here I have a printed turret assembly(THAT WORKS!), as well as a printed Wye and dart door for the ever popular hopper clip. On another note, i have a vertical foregrip and a crutch stock added for ergonomics.


TBH, this seemed like a pointless exercise before, as I didn't think producing nerf gun parts from a rapid prototyping device was a concept that needed proving. It's good you're starting to make a more complex blaster to take advantage of the capabilities offered by those machines. If you continue to have free or cheap access to it, you really can build damn near anything you want.


Yeah, I'm wondering how much all this stuff costs you to produce as well.
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#22 Split

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Posted 17 February 2011 - 07:27 AM

I think it's pretty awesome. I hope you do the coolest shit you can come up with. Props with doing something original and unseen.

That said, there's no denying that it'd be difficult/expensive for the rest of the community to replicate, much like Kane's blasters with milled and lathed and solid aluminum parts.
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#23 sputnik

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Posted 17 February 2011 - 12:00 PM

I think it's pretty awesome. I hope you do the coolest shit you can come up with. Props with doing something original and unseen.

That said, there's no denying that it'd be difficult/expensive for the rest of the community to replicate, much like Kane's blasters with milled and lathed and solid aluminum parts.



Hehe.



Way cool SorrowX.

When you get the chance, you should put the turret plans up too.
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#24 Daniel Beaver

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Posted 17 February 2011 - 04:35 PM

Neat.

Make it pump action!
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#25 utahnerf

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Posted 17 February 2011 - 05:44 PM

I think that he can do it for free.
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