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Motorized Buzzsaw Mod

First Post/First Mod! (pic heavy)

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#1 hadokn

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Posted 27 March 2008 - 02:56 PM

Hi everybody! I just got my posting privileges so I figured I'd kick things off with this mod I did a few weeks ago.

So I bought a Buzzsaw. I was pretty excited about it, it looked like a pretty cool gun. Turns out it wasn't as cool as I thought. I assumed that it was motorized, but you have to crank the thing to get it going. And you have to crank it ALOT to get any kind of decent range. And it's noisy as all hell. So, I decided to retire it to a good idea/poor execution kind of thing. Then I was digging through my closet and I found an old Tamiya R/C Car that hasn't seen use for a few years. IDEA!!


First things first, take apart the Buzzsaw. Do this by removing the twelve screws on the case. Lift off the case, and reveal the internals. Your next step is to remove the light blue crank rod thingy, and throw it away. We don't need it anymore.

Next, unscrew the two screws on the orange gearbox and expose the gears. It should look like this:

Posted Image

Now let's talk about how this gun works. It's actually pretty cool.

When you pull back the crank handle, teeth on the bottom catch on gear one. Gear one spins gear two, and the force of gear two spinning forces gear three down to engage the main gear which directly spins the drive wheel, which is what propels the balls out of the gun. When you stop pulling, a little spring pushes gear three out of contact with the drive gear, acting as a clutch and allowing you to pump back and forth while the drive wheel only spins one way. Pretty Sweet.

Then I tore the motor out of the R/C car. Unfortunately, the pinion gear on the motor does not mesh with the nerf gears, so I had to find a substitute. Some might call it coincidence that a Lego gear meshes perfectly with the nerf gears,

Posted Image

I call it destiny.

Now I had to cut out the middle of the lego gear and kind of squish it onto the pinion gear, which works fine, for now, but Iím working on a more permanent solution.

Posted Image
Posted Image

Next I mounted the motor to the orange panel that we removed earlier, lining up my new gear to mesh with gear two (I chose to remove gear one. Keeping it in might have increased the speed of the drive wheel, but it would also reduce torque. It was also easier to work without it). Take care to get these aligned and centered. If you donít, youíll generate a lot more friction, which will steal power from the gun. My motor has screw-mounting holes built in, so I just drilled three holes in the orange panel, two for screws and one for the drive shaft of the motor. Finished, it looks like this:

Posted Image

I had to trim the orange panel to make space for the screws, but it was no big deal. Now on the main gearbox you have to cut out a space for your new gear to sit. This is what mine looks like:

Posted Image
(ignore gear one, it should be removed now.)

Now, re-attach the orange panel with the newly mounted motor. Make sure that your gears will spin freely with as little grinding as possible. You may have to adjust your mounting holes. I know I did. Hereís what mine looks like now:

Posted Image
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Next, you have to cut a whole in the exterior case to accommodate the motor. I used a dremel for this. Dremels are invaluable. You should go buy one right now. Hereís the hole:

Posted Image

Now, if everything has gone well, you should be able to put everything back together.

Hereís what mine looks like fully assembled:

Posted Image

Okay, so right now itís pretty complicated and cumbersome. I need the speed controller to adjust the throttle of the motor. If I went from a dead stop to full speed the gears might grind and fly apart. Iím going to replace the electronic speed controller with a mechanical one so I wonít need the receiver. I will mount that to the gun along with the battery. I think that might make the gun a little more practical, but not by much. The thing feels like a gyroscope at full speed. Ranges are greatly increased. In fact the balls get so much backspin that they curve up at about twelve feet, so itís not very accurate.

It is a lot of fun, though. So let me know what you guys think, and if you have any questions. Iíll try to post a video on youtube later today. Thanks for having me here at Nerfhaven.
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#2 Cmdrmack

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Posted 27 March 2008 - 03:02 PM

See newbies, this is what we want from you as a first post. This guy has obviously read the code of conduct and a lot of the modification threads already in existence. He read first, and then posted after he had an idea of how things are supposed to operate.

Hadokn: Great first post, great mod.

Welcome to the Haven.
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QUOTE(Predalien_Ro @ Apr 7 2008, 10:24 PM) View Post

Oompa: FECES!? Who in their right mind would try that shit!?


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#3 boisie

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Posted 27 March 2008 - 03:03 PM

I think we found the Trap everyone wants...

I'm amazed, and I want one.

Edited by boisie, 27 March 2008 - 03:04 PM.

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#4 Green-Buckshot

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Posted 27 March 2008 - 03:05 PM

Someone should add this to the directory.

I mean like, wow, man :D .
That is uber ballin'. It looks like the most practical place to put the controls would be on the front of the gun, near the large orange gear-housing.
BTW: I suggest going to A.C. Moore or some craft shop to buy some stick on velcro. Just loop 2 bands around the ball at a perpendicular angle so that they meet in the center, and you can use them for dart-tag.
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QUOTE(A side of nerf @ May 18 2008, 12:33 PM) View Post

Also, could you post some more revealing pictures?

#5 Galaxy613

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Posted 27 March 2008 - 03:06 PM

Great use of Lego and RC parts. Welcome to 'Haven. :D
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#6 Bomberman

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Posted 27 March 2008 - 03:22 PM

That is awesome! I know that that thing is a real beast because I own a wheely king r/c car, 27t motor, and it is powerful, so I can't imagine what that thing can do. You should make a MUCH bigger ball tube. One that holds about ten. But anyway, what kind of r/c motor is that? (number of t. (turns))
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QUOTE(silentsnipe) View Post

It's not like that. I put lube on it and its the same. Its just stuck. And when I cock it back it goes farther back then usual. Also I push as hard as I can and it wont go back in. I've tried the methods and they wont work. Also pics are up.

#7 Z-man12

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Posted 27 March 2008 - 03:24 PM

The only reason I havn't done something like this to the buzz saw yet is I just can't find a motor that suits my taste.

Im curious as to if your RC motor has enough tourque to continue fireing rapidly with out the fly wheel slowing down siginificantly. Do you have that problem?
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#8 Eboreg

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Posted 27 March 2008 - 03:26 PM

I was wondering when someone would do that. Welcome to the Haven and keep up the good work.
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#9 Ro-Sham-Bo

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Posted 27 March 2008 - 04:07 PM

Excellent first post. The write-up was clear and easy to understand. Good Job and welcome to NerfHaven.
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#10 ChiliPepperFender

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Posted 27 March 2008 - 04:48 PM

That's totally awesome, but also looks cumbersome. Anyways great first post and nice mod!
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#11 Kid Flash

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Posted 27 March 2008 - 06:25 PM

Did you not do the full auto mod? Or did i just not see it? That thing would be a beast if you did a full auto one with a big hopper for an indoor war. Great mod, great first post, welcome to the haven.
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#12 Carbon

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Posted 27 March 2008 - 06:56 PM

My god, it's full of awesome.

Very, very cool...looking forward to seeing it in action. And I agree, this gun is crying out for a hopper and the full auto mod. Three liter bottles have been used on buzz/ripsaws to increase the capacity.
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#13 DTReaper

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Posted 27 March 2008 - 07:08 PM

Since you have a reciever on it anf its electric couldn't you in theory use it as a trap or something, that would be pretty cool and good job nice first post.


-DTR
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#14 wilbyrum

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Posted 27 March 2008 - 07:35 PM

Since you have a reciever on it anf its electric couldn't you in theory use it as a trap or something, that would be pretty cool and good job nice first post.


-DTR


Yes you could. You would have to rig up a way to have the trigger run off a remote, but this could be done with a small electric actuator with a remote switch since you already have a power source. Only problem is it wouldnt really be all that effective unless it was covering something similar to a ally-way. Yet it would still scare the hell out of someone if they did not know it was there.

Edited by wilbyrum, 27 March 2008 - 07:36 PM.

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#15 NerfCrazy

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Posted 27 March 2008 - 07:43 PM

That is just simply awesome so I have to do it now. Nice first post. You could use it in tower battles when they try to rush. Just have a stand or something for it and have it remote activated.

Edited by NerfCrazy, 27 March 2008 - 07:44 PM.

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#16 Richomundo

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Posted 27 March 2008 - 08:53 PM

Nice work :o

If you're worried about the gears

If the gears are normal sized, I'd see if I could replace the plastic gears with metal ones, or if that doesn't work, then mount another gear to change the ratio so that the motor doesn't completely demolish the teeth.

also, have you tried adding a resistor instead of the speed controller? Once you get a perfect speed / gear ratio set, it should be pretty simple to mount the batteries and tuck everything inside the gun.
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#17 Captain

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Posted 27 March 2008 - 09:10 PM

This is a really nice mod, amazing job.
Only, now I feel like I need to contribute a mod or something to the site, after all of my posts, I haven't thought of any mods to perform and make a write up. I just need to get some barrel material, and there are other complications...
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#18 OberonFox

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Posted 28 March 2008 - 01:52 AM

Excellent mod, cant wait to see the polished final product. Also, THANK YOU for taking decent pictures.
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#19 BendyStraw

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Posted 28 March 2008 - 08:41 AM

Wow, that is really impressive.
Welcome to Nerfhaven, and I look forward to more of your stuff.
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#20 Pineapple

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Posted 28 March 2008 - 02:20 PM

hadokn, you're the ONLY one who ever posted the mod, although I'd say dozens of people here claimed to have made it, or were intending to do it (which you know, for the most part, never happens).

Good on you for forging ahead, and actually doing it, nice clean work also. As you troubleshoot and find out what does work and what doesn't work (is that a Mabuchi 380 can or 540 can motor?), we look forward to the results of your experimentation and R & D. I just wish more NerfHaven members would dedicate themselves to projects instead of making some pretty nasty looking ghetto blasters, then running to the next fad blaster project that rolls down our way (how everyone is "talking" of what they want to do to the Vulcan, for example).

Keep up the good work. And thanks for patiently waiting for validation. I hope you find it worth your wait.



-Piney-
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<!--quoteo(post=209846:date=Feb 5 2009, 06:27 PM:name=boom)--><div class='quotetop'>QUOTE(boom @ Feb 5 2009, 06:27 PM) View Post</div><div class='quotemain'><!--quotec-->
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#21 hadokn

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Posted 19 May 2008 - 02:50 PM

So here's a video of the thing in action. I'm still working on integrating everything, but school gets in the way. Enjoy.

Buzzsaw Video

Edited by hadokn, 19 May 2008 - 02:51 PM.

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#22 Thomas

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Posted 19 May 2008 - 02:55 PM

Oh. My. God. That sounds so intimidating, and awesome ranges. Holy shit, great job.
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#23 Green-Buckshot

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Posted 19 May 2008 - 03:01 PM

So here's a video of the thing in action. I'm still working on integrating everything, but school gets in the way. Enjoy.

Buzzsaw Video


I do NOT want to be on the receiving end of that... I love this mod.
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QUOTE(A side of nerf @ May 18 2008, 12:33 PM) View Post

Also, could you post some more revealing pictures?

#24 Bomberman

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Posted 19 May 2008 - 03:07 PM

Wow, I have to say, that looks amzing in action. Take it outside and fire it, and see what kind of ranges you get. And just a heads up, this topic is a little old, you might have wanted to have just posted a new topic, then provided a link to the old one. But really, you have to have a hopper on that thing. Rapid fire, that thing is deadly. Since it has to have a controller, I think that in a war, you could mount that thing on a tripod or something, and just hide behind an object, and when someone walks by, just rev it up, and unleash some ball power!
And what motor is that? I replaced the motor in one of my rc cars, and I have a spare lying around.

~Bomberman

EDIT: Man, those two posts popped up quickly..

Edited by Bomberman, 19 May 2008 - 03:08 PM.

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QUOTE(silentsnipe) View Post

It's not like that. I put lube on it and its the same. Its just stuck. And when I cock it back it goes farther back then usual. Also I push as hard as I can and it wont go back in. I've tried the methods and they wont work. Also pics are up.

#25 Ubermensch

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Posted 19 May 2008 - 05:20 PM

Did you do the "rapid fire" mod on it? If so, that is beastly. Props for being the first one to post this!
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