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Nerf Gun Mod [message #63820] Mon, 11 March 2013 18:08 UTC Go to next message
avatar nuwbZ  is currently offline nuwbZ
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You probably know Nerf Guns, every part is plastic (except for springs, motors... duh). I've decided that I want to modify a Nerf blaster I bought to be more powerful. Currently it fires about 20-30 feet... if you're lucky and if you're waiting for the motors to all the way back up (it uses a "flywheel" system to semi-automatically fire darts). Honestly, I never really bothered to look much at Shapeways until I got done with the parts, so I guess this is more or less an explanation of what I've done thus far.

I've taken my gun blaster apart and have stripped out the motor and wheel assembly pictured here (minus the wheels, I seem to have lost one..)
http://i1355.photobucket.com/albums/q710/nuwbZ/303d05d6-4194-4493-a61d-1aca3305573a_zps14e8a39d.jpg
Motor mount as assembled in the blaster



What I plan on doing with Shapeways is to print a new version of the mount for the motors so that it accepts some larger motors I've purchased. Additionally, I plan on having a pair of new wheels printed for this because I had to change the spacing of the motors so that they would fit, not to mention the original wheels were too small to fit around the motor like the original placement.
http://i1355.photobucket.com/albums/q710/nuwbZ/4f9d285b-cbd9-4500-803c-157c7db0213e_zpsc128dad0.jpg
Motor mount and wheel with new motor (left) and original motor (right).

http://i1355.photobucket.com/albums/q710/nuwbZ/71861c23-5a4f-4ecf-b228-600fea6c293b_zps52c3ce37.jpg
Size of new motor compared to original motors in assembly


So far I've modeled the original mount (to make an accurate replacement) in Autodesk Inventor (the software I use for school) and used that to make the replacement. It's taken me a few weeks of on and off hobby work on it, but I have it finished.
http://i1355.photobucket.com/albums/q710/nuwbZ/MotorMounts1_zpsb4a8675c.png
Motor mount models side-by-side

After making that and easily making models of the motors, I used the replacement mount to then produce a set of wheels that would work in the assembly the same way the old wheels would, and from there I have my final assembly model.
http://i1355.photobucket.com/albums/q710/nuwbZ/f263b074-e25e-44ff-9fdd-9627b278e7b7_zpsfc388ba8.jpg
Motors are in blue. Mount is in white. Wheels are in orange. Dart (being launched) is in cyan.



I am hoping to send the order in soon to get these (three) parts made, but converting the models seems to be giving me quite a bit of trouble, whenever I upload it, the dimensions turn out to be something absurd like a volume of 90.83cm^3 for one of the wheels when in Inventor I get a more moderate (and correct) volume of .338 in^3 (5.539 cm^3). I've tried uploading in multiple formats like .stl, .wrl, and .dae (via the recommended converter) and still none of them gives me the dimensions which I used in the design of each model. So at this point I guess I'm stuck and would really appreciate any help at all.
Re: Nerf Gun Mod [message #63825 is a reply to message #63820 ] Mon, 11 March 2013 19:33 UTC Go to previous messageGo to next message
avatar JACANT  is currently offline JACANT
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Get a copy of http://www.netfabb.com/basic.php
Export your model as STL
Open in Netfabb where you can check, measure, scale and repair your model.
WYSIWYG
If you change anything go to part - export part as STL


jacantdesign@gmail.com
Re: Nerf Gun Mod [message #63831 is a reply to message #63820 ] Mon, 11 March 2013 21:44 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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Thanks for the help. I got all of the confusing shenanigans worked out and everything seems to be correct involving dimensions between Inventor and Shapeway's system. All the parts are ordered and I'm excited to get to work on my project.
Re: Nerf Gun Mod [message #63841 is a reply to message #63831 ] Mon, 11 March 2013 23:50 UTC Go to previous messageGo to next message
avatar JACANT  is currently offline JACANT
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Glad to help. Nice modeling
Here's a freebie for you. Till April on Windows, no limit on a Mac
http://labs.autodesk.com/technologies/fusion


jacantdesign@gmail.com
Re: Nerf Gun Mod [message #63964 is a reply to message #63825 ] Wed, 13 March 2013 06:29 UTC Go to previous messageGo to next message
avatar robertpalm89  is currently offline robertpalm89
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Cab one hallow out a tail with nettfabb? I really need help with that.
Re: Nerf Gun Mod [message #63986 is a reply to message #63964 ] Wed, 13 March 2013 13:01 UTC Go to previous messageGo to next message
avatar UniverseBecoming  is currently offline UniverseBecoming
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robertpalm89 wrote on Wed, 13 March 2013 06:29

Cab one hallow out a tail with nettfabb? I really need help with that.


What are you trying to do exactly? It depends on what you mean by hollow out.

Oh, but you shouldn't answer here though, you should make a new thread about it so this thread can continue to stay on subject since the author will probably make updates when he receives the parts. Just post up a new thread with a description of what you're trying to do exactly and we can come see what you're up to.






It always was. It always was because somethingness cannot spawn from nothingness. And in the was of the past there is the forever of the now. Only now. Only now and nothing new, for anything new would add to the infinite, yet there can only be one infinite. Only one. The universe is only becoming something new in the delusion of our minds. This delusion that makes life worth living in our perceived universe becoming.
Re: Nerf Gun Mod [message #63987 is a reply to message #63831 ] Wed, 13 March 2013 13:11 UTC Go to previous messageGo to next message
avatar UniverseBecoming  is currently offline UniverseBecoming
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College student kills man with augmented Nerf gun using 3D printed parts printed at Shapeways! NEWS AT ELEVEN! HAHAHA!!! Laughing

Just kidding! Very Happy

Nice mod! One thing I thought of while looking at your mod was, what if you angled the motors slightly, so that in addition to ejecting the dart, they also impart some spin to make the dart fly more accurately on its intended trajectory. Smile






It always was. It always was because somethingness cannot spawn from nothingness. And in the was of the past there is the forever of the now. Only now. Only now and nothing new, for anything new would add to the infinite, yet there can only be one infinite. Only one. The universe is only becoming something new in the delusion of our minds. This delusion that makes life worth living in our perceived universe becoming.
Re: Nerf Gun Mod [message #64004 is a reply to message #63987 ] Wed, 13 March 2013 16:42 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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UniverseBecoming wrote on Wed, 13 March 2013 13:11

Nice mod! One thing I thought of while looking at your mod was, what if you angled the motors slightly, so that in addition to ejecting the dart, they also impart some spin to make the dart fly more accurately on its intended trajectory. Smile


The thought crossed my mind at one point, but it would be difficult to get it perfectly right and not send the dart into the barrel. I was intending to up the range/power of the darts, I figured adding rifling/spin of any kind would merely complicate the project.
Re: Nerf Gun Mod [message #64009 is a reply to message #64004 ] Wed, 13 March 2013 17:09 UTC Go to previous messageGo to next message
avatar UniverseBecoming  is currently offline UniverseBecoming
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Yeah, you'd need at least three motors or idler wheels to facilitate alignment, so that would complicate things a bit. On the other hand, being that the darts weigh very little there would be minimal benefit provided by centrifugal forces.






It always was. It always was because somethingness cannot spawn from nothingness. And in the was of the past there is the forever of the now. Only now. Only now and nothing new, for anything new would add to the infinite, yet there can only be one infinite. Only one. The universe is only becoming something new in the delusion of our minds. This delusion that makes life worth living in our perceived universe becoming.
Re: Nerf Gun Mod [message #64066 is a reply to message #64009 ] Thu, 14 March 2013 09:48 UTC Go to previous messageGo to next message
avatar leorolph  is currently offline leorolph
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maybe putting a rough texture on the wheels would allow them to grip the darts better for cancelling any slip. also using high power brushless motors would give higher speed. something like a 9000kv would really spit them out!... or even using several smaller gears (instead of one big wheel) to create more torque.
Re: Nerf Gun Mod [message #64083 is a reply to message #64066 ] Thu, 14 March 2013 14:55 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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leo rolph wrote on Thu, 14 March 2013 09:48

maybe putting a rough texture on the wheels would allow them to grip the darts better for cancelling any slip. also using high power brushless motors would give higher speed. something like a 9000kv would really spit them out!... or even using several smaller gears (instead of one big wheel) to create more torque.

I'm using two Banebots RS 380 motors. They're 7.2v motors with a maximum RPM of 16,200 (with no load; 13,900 RPM peak efficiency) with a stall torque of 11.51 oz-in (1.92 oz-in peak efficiency). Considering the darts and comparing with the original motors (which I have no solid numbers for), these are much more powerful and should never slow down even with rapid firing (trigger pulling), whereas the originals would slow down significantly after the first shot. I don't think it would be necessary to use gears to slow down to increase the torque of the motors, no to mention how much more complex it would make the project.
Re: Nerf Gun Mod [message #64096 is a reply to message #63987 ] Thu, 14 March 2013 17:16 UTC Go to previous messageGo to next message
avatar AmLachDesigns  is currently offline AmLachDesigns
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UniverseBecoming wrote on Wed, 13 March 2013 13:11

One thing I thought of while looking at your mod was, what if you angled the motors slightly, so that in addition to ejecting the dart, they also impart some spin to make the dart fly more accurately on its intended trajectory. Smile


Perhaps you could get a similar effect by using drive wheels with diagonal bars on? As in helical gears.

Quote:

On the other hand, being that the darts weigh very little there would be minimal benefit provided by centrifugal forces.


Very true, but there might be some drag reduction from the spin, giving increased speed/distance. I don't know what type of projectiles you use, but if they are un-aerodynamic, low-density foam cylinders you might get some good gains from relatively low rates of spin. An interesting line of enquiry.

Re: Nerf Gun Mod [message #64163 is a reply to message #63820 ] Fri, 15 March 2013 13:47 UTC Go to previous messageGo to next message
avatar jeff  is currently offline jeff
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Looking forward to seeing how this turns out.

I know you stick w/ the flywheel designs for semiauto firing, but have you played with the new NERF Retaliator blasters? I have one of those and the darts are wicked fast out of that thing, downside is at that speed they curve and are fairly inaccurate. fun nonetheless.


Jeff Bare
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Re: Nerf Gun Mod [message #64463 is a reply to message #63820 ] Wed, 20 March 2013 02:31 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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It's here.
*Meager attempt at villainous laugh*
http://i1355.photobucket.com/albums/q710/nuwbZ/932f33c7-e82a-42fa-b40c-ce9bf029a9a4_zps0db07683.jpg

http://i1355.photobucket.com/albums/q710/nuwbZ/IMG_1669_zps9b3702c3.jpg



I'm excited.

Will post update soon! I have a test to study for.

[Updated on: Wed, 20 March 2013 02:32 UTC]

Re: Nerf Gun Mod [message #64469 is a reply to message #64463 ] Wed, 20 March 2013 04:32 UTC Go to previous messageGo to next message
avatar UniverseBecoming  is currently offline UniverseBecoming
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I'm excited too! Surprised

Danggg! Look at that! I can see the polygon facets on those cylinders! Amazing resolution!

Makes me want to make something mechanical in polyamide. Very Happy






It always was. It always was because somethingness cannot spawn from nothingness. And in the was of the past there is the forever of the now. Only now. Only now and nothing new, for anything new would add to the infinite, yet there can only be one infinite. Only one. The universe is only becoming something new in the delusion of our minds. This delusion that makes life worth living in our perceived universe becoming.
Re: Nerf Gun Mod [message #64475 is a reply to message #64469 ] Wed, 20 March 2013 08:41 UTC Go to previous messageGo to next message
avatar wedge  is currently offline wedge
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Yes looks good.
Now i want to see it asembled in the nerf!
Re: Nerf Gun Mod [message #64493 is a reply to message #63820 ] Wed, 20 March 2013 16:27 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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Alright: I actually messed around with all of this yesterday, I just didn't get around to posting it like I wanted to. In other news I think I rocked that test I was studying for instead....


So anyway: I have yet to get a 7.2v (RC car, charges to roughly 8.5v) battery to put in the gun, so everything I've done has been off of four AA batteries (1.5~1.8v each, in series 6~7.2v). Additionally, I need to get screws to secure the motors in the mount, because currently they are only a snug fit in the opening I made for the motor's bearing.
http://i1355.photobucket.com/albums/q710/nuwbZ/1cbd9b23-78ed-41e1-88d0-ef548b72d73b_zpsaa80f947.jpg
Motor bearing snugly fits into the part, with some shaving of the material around the hole.

There's a few minor issues with the part I would want to point out if I ever make this public so long as it works:
http://i1355.photobucket.com/albums/q710/nuwbZ/0437d1e4-9fd5-48a9-8710-4a5d4943a52a_zps294b2086.jpg
Some of the box shapes on the bottom (that meet with the bottom part of the assembly), two of them are strangely inverted. The holes where the top part meets the bottom are a bit out of alignment, but these two aren't big deals, as you'll see later. The holes for the screws to mount the motors are almost non-existent, I had to punch them out from the small divots that they were. Finally, the holes for the motor bearings are just a smidge too small, I had to open them up a little bit with a small knife, no big deal.


After basically press-fitting the wheels onto the motor shafts (tight as they should be, albeit a little tough to get on), I found that the bottom piece of the motor assembly won't fit with the new wheels on, and the wheels have very little clearance and are nearly touching the outer shell, so I'll have to do without the bottom piece, which seems like no big deal.
http://i1355.photobucket.com/albums/q710/nuwbZ/b50b0477-ddb7-418f-8889-16763c38665e_zpsabfb2f32.jpg
The clearance between the two wheels is just enough to pinch the dart a little bit, so for that, I'm happy. On another note: the white strong and flexible material seems a tad bit abrasive to use against the darts, it's already skinned a bit off of one dart thus far.


So I've got the motors mounted and everything seems pretty lined up and I've tested the motors and they do work, so that won't be an issue. So for now, I'm just waiting on screws and a proper battery.
http://i1355.photobucket.com/albums/q710/nuwbZ/38523697-597a-4f59-b167-045caa4e4220_zpsb35bedc2.jpg




So for next time, I'll have all the wiring done, give the motors a good running test and I'll probably be evaluating the results of any testing I do.
Re: Nerf Gun Mod [message #64517 is a reply to message #63820 ] Wed, 20 March 2013 20:07 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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Alright, so here's the pictures of the wiring done with it, I'll see about getting a video of it working up soon, but I'm having some issues with it shaking without having the screws I need so it's been firing a little awkwardly. I'll probably just take a video of the assembly I made shooting a dart, which I must say has been pretty impressive.

http://i1355.photobucket.com/albums/q710/nuwbZ/7559ca96-491d-4c43-8b06-5cc36592532d_zps055ab3bd.jpg


http://i1355.photobucket.com/albums/q710/nuwbZ/IMG_1690_zps7d0a7895.jpg
On another note: I've added electrical tape to the flywheels to increase grip and decrease abrasion.
Re: Nerf Gun Mod [message #64991 is a reply to message #64517 ] Wed, 27 March 2013 13:54 UTC Go to previous messageGo to next message
avatar nickelroadgifts  is currently offline nickelroadgifts
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This is awesome! You'll have to post some video of it!
Re: Nerf Gun Mod [message #64996 is a reply to message #63820 ] Wed, 27 March 2013 17:22 UTC Go to previous messageGo to next message
avatar InnerbreedFX  is currently offline InnerbreedFX
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Love this. nice little idea.
good design of the part also. well done. look forward to seeing more.


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Re: Nerf Gun Mod [message #65044 is a reply to message #63820 ] Thu, 28 March 2013 00:47 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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Things seem to be going well in getting testing and tweaking, I've already considering making a first revision of the motor mount. At this point I would adjust the positioning of some mounting points slightly as well as adding a support between the locations of the two motors... they are vibrating a good bit. After that, I'm planning on finishing up the whole thing so it is presentable in a certain fashion (as in, the other side of the shell will fit together) before I make a video; besides, what fun is half a nerf gun anyway? I've got a tripod for my camera and I've got some RC car batteries at home that will do quite nicely as well.
Re: Nerf Gun Mod [message #65825 is a reply to message #63820 ] Tue, 09 April 2013 15:36 UTC Go to previous messageGo to next message
avatar nuwbZ  is currently offline nuwbZ
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Alright! So, long time no see. I've got good news and bad news. The good news is I've basically finished everything I've planned on doing with this Nerf Gun and here are the pictures:

http://i1355.photobucket.com/albums/q710/nuwbZ/IMG_1701-1_zps1616ddaf.jpg
The area I cut open on the opposite face of the shell, could have been cleaner, but it's a first try.

http://i1355.photobucket.com/albums/q710/nuwbZ/7b222ac7-5b7f-4b54-be13-15864044a41f_zpscfc85df6.jpg
Here's all of it together!

http://i1355.photobucket.com/albums/q710/nuwbZ/0c13d84c-0440-44c2-8e07-60ead270b4b0_zpscf919390.jpg
The slots for the battery cover are just wide enough for my wires... score.

I added a tamiya-type connector for most 7.2v or 9.6v RC car batteries and after adding trying it out with a 7.2v battery, I noticed an immediate improvement in performance over the AA batteries (which improved on the performance of the original motors with AA batteries). Here's the bad news I mentioned up top: when I tried out a 9.6v battery with the setup (the motors are rated for 6v-10v, the 9.6 should charge with a surface charge near 11v, no big deal really), but what I didn't account for was the high speeds this could cause the motors to produce, it was high enough that when I shot two darts, the electrical tape I added to the wheels for grip came off... in powder form. So now most of the inside of the mechanism has a thin coat of black, sticky powder, awesome.

In other news: testing with the 7.2v battery, before the grip tape got ruined (I've yet to replace it at the time of this post), showed a range of about 60 feet (easily doubling the max range of the dart gun). I'll see about making a video shortly, but I didn't get everything done with it I wanted in order to actually making a video showcasing it. I hope to get one done shortly, in the meantime, I need to get the wheels fixed and look about something that might be better than electrical tape for this purpose... I was thinking possibly heat-shrink tubing, maybe.


Currently, I'm looking into making revisions for the design with a few things in mind:

  • A support between the two motors mounts to reduce vibration
  • Taller outside supports to better center the flywheels on the barrel
  • Slightly wider opening for motor shaft on flywheels (currently waaaay too snug)
  • Removing unnecessary support pieces which were present on the original part
Re: Nerf Gun Mod [message #66361 is a reply to message #65825 ] Thu, 18 April 2013 17:03 UTC Go to previous message
avatar lensman  is currently offline lensman
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