Digital.Complex: [nerf] Centurion (N-Strike Elite) - Digital.Complex

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[nerf] Centurion (N-Strike Elite)

#1 User is offline   aotsukisho 

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Posted 20 December 2013 - 03:49 PM

Itoe gave me permission to hack up his Centurion.

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before disassembly

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extra long screw in the buttstock

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didn't really have to take these off, as they're for the barrel extension

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took a photo of the dart tooth mechanism just in case...and also took a video, since it's not as simple as it looks.



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looking towards the rear of the piston

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the gear is for the priming mechanism

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removing the barrel catch

So I had an idea that I wanted to make a Mega-size flywheel blaster. There were multiple problems with it, most importantly was securing the flywheel material that was balanced enough.

I dug around in my parts drawer, and found the two T600 motors I used for the EDF-Revo project.

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a few hours of prototyping and drilling later

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I spaced them 2mm narrower than the dart

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active.

I took a short video to prove that my proof of concept works. I will be modifying the design to take the dart in a consistent manner, please stay tuned for updates.


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#2 User is offline   aotsukisho 

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Posted 13 January 2014 - 05:32 PM

I had some time to start fully dismantling the blaster last night.

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the barrel extension is a bitch and a half to remove if it's been put on normally, thanks to several catch mechanisms including one that is built into the extension. It's also glued together in the areas meant to be used as sling mounting points, such as this one.

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the spring is the internal one-way mechanism to prevent removal of the barrel once it's been installed

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cracking open the rest of the barrel

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the piece with the three posts on either side actually belongs in the Centurion body, but the locks prevent it from coming out until the entire thing is dismantled.

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that inner barrel is a big bitch. I'll take measurements later

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one of the locks prevents magazines from being loaded if the barrel extension isn't connected. What the hell

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magazine release mechanism

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in order to fully gut the shell, I needed to remove all of this crap in the rear. There was no plunger assembly, but the priming handles and trigger assemblies need to go

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shazam

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if you're wondering how I did that without removing any pieces, the shell of the Centurion is flexible enough to push it apart and pull the rack through. You can pry the handle out and remove it that way too (I ended up doing exactly that after I removed both racks) but this way I think it's easier.

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now they're empty

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first time I've held a Centurion without the pegs sticking out (and without all of its guts, too)

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modified the barrel locks so that it can be pulled out with some effort. Instead of looking like a ramp, it now looks like a mountain.

I actually found some other motors to use as the flywheels, since the T600s are huge and they will heavily bias the weight towards the front. They are still in the mail, I will update when they come in.
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#3 User is offline   aotsukisho 

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Posted 23 January 2014 - 12:32 PM

I got the motors in but haven't played with them yet, since I found an old box that I've been searching for for ages. I got a whole bunch of pinball solenoids back in high school, and one of them was a long stroke push-type that I was intending on using as the dart loader. I figured it would be easier than designing a gearbox like the Rapidstrike, and it can be controlled electronically if need be. I worked on getting it mounted last night.

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box of solenoids that I found. The one I plan on using is the one with the pushbutton connected to it in this photo

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the plunger body was plastic, so I drilled a hole in it and mounted a spacer (unused transmission gear from my Revo) on it. The spacer allows me to mount the solenoid further back where it's more comfortable, and increases the effective diameter of the plunger so that it doesn't just poke through the hole in the dart foam and actually pushes the dart forwards into the flywheels. I'm testing the layout of the solenoid at this point, but I did trigger it with a 4s lipo and this is how far it pushes the dart. Not bad at all.

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I can reuse the priming gearbox sled as a mounting point, which I will be doing. Placement of the solenoid is as follows, I'm gonna use that steel piece between the solenoid and the plastic so I can secure it using more than three screws.

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Solenoid temporarily mounted using spacers to simulate the steel piece, and this is how far it pushes the dart when fired. The added plus of using a solenoid that I quite like is that it kicks when you fire, because of the weight.

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Because I took out the priming handles completely, the space can now be used to ensure that there's some form of cooling airflow going on inside the blaster. You can see the solenoid base through the gap in this photo.

I can use the existing trigger to hook up a microswitch to, but I was also thinking of using my leftover Rapidstrike accel trigger to spin up the motors. I need to do a whole lot more testing but this project is finally starting to come together. I'm satisfied at the progress, I hope I can call it done soon.
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#4 User is offline   aotsukisho 

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Posted 24 January 2014 - 04:54 PM

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These are the motors I got off of ebay for cheap. They are Lanxiang 2836 motors, rated for 2100kv and rated for 40A @ 6s (910W). Previous owner had installed 3.5mm bullets on them that I removed and replaced with 4mm ones.

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Reused the EDF-Revo mounting brackets because they were the right dimensions to use for the motor testing.

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closeup

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This is the setup that I used for testing. The barrel is simply there to test the divergence of the dart, only one out of the twenty something darts I test fired/fed bounced inside the barrel so I think this is a good sign.



Last but not least, here's the Youtube vid of the test setup. Because the Mega darts weigh the same as the Elites and moreso because the outrunner motors have a much higher rotating mass than the plastic flywheels, the RPM doesn't even audibly drop for more than a split second. This is good for rapid fire (out of a six round sniper rifle haha).

This proves that my setup will work once it's in the blaster, so now it's time to stop testing and to start fabbing.
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#5 User is offline   aotsukisho 

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Posted 27 January 2014 - 05:04 PM

Did more work on the Centurion over the weekend.

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drilled out the steel plate to mount the solenoid

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holes drilled in the priming gearbox, the ground off area is to accommodate the head of the third screw that's holding the solenoid in place.

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mounted up using whatever random screws of roughly the same size I could find laying around. I have to go buy more hardware

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a look from the side

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mounted in the Centurion

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testing the layout again fully mounted. The pusher motor works like a charm

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I wanted this to be as mid/rear heavy as possible so I used plexi as a motor mounting plate.

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spaced as such.

I'm gonna be working on a mounting setup for the blaster, but as of right now progress is good!
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#6 User is offline   aotsukisho 

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Posted 28 January 2014 - 06:15 PM

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Running into snags here and there, the solenoid's solder tabs don't allow the access door to slide back all the way. I stressed about it for awhile but then quickly realized that I might have to end up deleting the door altogether so I put it aside for later.

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Cut at the line

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Cut at the line

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Trying hard not to shave off anything important

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More space in the motor mount area

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Removed all of the supporting braces and the top screwhole

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I had intended to mount the motors horizontally so they would sit like saddlebags, but unfortunately this isn't possible. Even with one motor completely touching the wall of the blaster, the assembly isn't even near centered in the blaster. With this information, I will have to figure out a way to mount the motors vertically like how they are in the conventional flywheel blasters. This means that they will be able to fit in the case without too much problems, but I will have to do a lot of grinding near the top of the blasters.

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grinding off more material from the magwell

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I'm gonna have to shove the motors right next to the magazine

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I'll work more on this later, I ran out of time for the night.
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#7 User is offline   aotsukisho 

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Posted 21 February 2014 - 06:08 PM

I can't believe this project has been stagnant for almost a month...

I drew up a schematic on the electronics that will be going into the blaster. I haven't tested the 555 one-shot yet, but the capacitor next to the switch is supposed to trigger the one-shot only once regardless of how long the button is pressed. I used a relay for the ESC controller as well, so I could put a status LED on it without worrying about that voltages in the servo tester. Both the ESC controller relay and the one that handles the solenoid are 30A automotive ones that I have laying around in bulk.

Results will be posted after building the circuit. For now this is all theoretical, but hopefully everything works like how I want it to.

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#8 User is offline   aotsukisho 

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Posted 29 May 2014 - 02:35 PM

Nicholas Prado has featured one of my photos in his blog post reviewing the Centurion. Check it out here! Thanks for the link back!
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