RC Nerf Tank - Brainlyassets.openstudy.com/updates/attachments/52781aa9e4b0ebf890295f9e... · The...

My first ever Instructable, yay!

This was one of the more fun projects I've attempted and I'm fairly pleased with the results.

Most of the parts and skills used in this project are from my fighting robot hobby. It might seem like a

complex project but anyone with basic handy-person skills and willing to do the research could build a

similar machine.

Anyways I'll let the rest of the Instructable do the talking, enjoy!

(/files/deriv/FMK/Y7RQ/FTM72OWC/FMKY7RQFTM72OWC.LARGE.jpg)

About This Instructable

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travis7s (/member/travis7s/)

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RC Nerf Tank by travis7s (/member/travis7s/) (/contest/epilogchallenge/)

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RC Nerf Tank http://www.instructables.com/id/RC-Nerf-Tank/?ALLSTEPS

1 of 23 11/4/2013 3:08 PM

Step 1: The Design

I'm not much of a computer aided design guy, I tend to get a picture in my head and go with that. I made

a list of things I wanted the machine to include. Some made it and some didn't. You can also clearly see

how good of an artist I am.

Step 2: The Baseplate

Related

See More (/tag/type-id/?q=)

(/files/deriv/FJB/17R0/FTM72OX2/FJB17R0FTM72OX2.LARGE.jpg)

/travis7s/)I like to build things... except for wiring..

wiring sucks.Bio:

(/id/The-Automatic-Button-Pusher)

(/id/The-Insanity-Bringer-Ringer)

(/id/The-Bleeding-Pumpkin)

More by travis7s

nerf (/tag/type-id/category-technology/keyword-nerf/)

tank (/tag/type-id/category-technology/keyword-tank/)

rc (/tag/type-id/category-technology/keyword-rc/)

robot (/tag/type-id/category-technology/keyword-

robot/)

Tags:

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Autonomous Arduino Tank(A.A.T) (/id/Autonomous-Arduino-Tank-AAT/)by That-One-Kid (/member/That-

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Tankbot - Internet ControlledTank Robot (/id/Tankbot-Internet-Controlled-Tank-Robot/)by joe (/member/joe/)

RC Nerf Tank (/contest/epilogchallenge/)

+ Collection22 Steps Favorite)


2 of 23 11/4/2013 3:08 PM

I dug through my scrap bins until I found this 18" x 14" x 0.1" aluminum sheet. My work is neighbors with

a machine shop and they let me help myself to anything in their scrap bins . 90% of the metal in this

project is recycled from those bins!

I decided to try and fit everything inside this sheet, it was just about the perfect size in the end.

Step 3: Turret assembly

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3 of 23 11/4/2013 3:08 PM

The main weapon is going to be a modified Nerf Vulcan. It needs a place to mount and it needs to be

able to pan back and forth, that's where the turret will come into play.

I found a pulley like disk in the scrap metal bin which will be the base for the gun. I actually have about 8

of these disks that they scrapped for some reason. A lazy susan bearing will allow it to spin fairly

smoothly and a chunk of 2.5" aluminum square tubing will act as the 'tower'. It just so happened that the

bearing mounting holes lined up perfectly with the walls of the square tube.

I machined some long round standoffs that will hold the standard Hitec servo that will spin the turret. I

used a homemade wheel from one of my old robot projects as the drive pulley. A large elastic band will

(http://cdn.instructables.com/FP8/YC1Q/FTRJ7A95/FP8YC1QFTRJ7A95.LARGE.jpg)

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4 of 23 11/4/2013 3:08 PM

be the belt, its not the smoothest belt solution but it does self tension.

Step 4: Drive motors

To move the tank I went looking as the local hardware surplus store. I found a pair of 24V 'Valco'

gearmotors for $15 each. They spin at about 50rpm, are made in Germany, and have a 8mm hex bore

instead of a shaft.

They are bolted to some 3" x 4" blocks I cut out of 0.5" polycarbonate.

Step 5: Mounting turret and motors to the base

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5 of 23 11/4/2013 3:08 PM

I centered the turret and use some 1" x 1" x 0.125" steel angle stock to bolt it down.

I tapped holes in the polycarbonate blocks and screwed the motors to the baseplate. Polycarb is one of

my favorite materials, mostly because its clear so its very easy to line holes up and is much, much

stronger than acrylic.

Step 6: Drive shafts

I had to make some custom shafts to mount the wheels to. I was originally just going to modify some

allen keys of the right size but I ended up getting some 5/16" stainless steel hex bar. I turned the end

down in my lathe and cut 1/4-20 threads on the end. Screws on both sides of the motor keep the shaft

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6 of 23 11/4/2013 3:08 PM

from moving out of place.

Step 7: Attaching the wheels

The wheels are stock tires from a Traxxas E-Maxx monster truck. The wheels were donated by some

friends who had upgraded their truck to fancier wheels. I made up some more blocks and shafts to

mount the other wheels and supported them with bronze bushings.

They attach to the shafts with a 1/4" locknut and a rubber backed washer to keep the wheels from

slipping.

Step 8: Mounting the Vulcan

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7 of 23 11/4/2013 3:08 PM

I decided to use magnets to mount the gun to the turret. The benefits of this are the gun is easy to

remove and I don't have to drill that many holes into the thin nerf plastic.

I'm using a powerful magnet I got out of a computer hard drive, I screwed a thin piece of steel to the

turret that will act as the anchor for the magnet.

Step 9: Modifying the vulcan

I needed a way to pull the trigger remotely, and like the turret I'm going to use a servo.

For anyone wanting to build remote controlled projects servos are the way to go. You can modify them

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8 of 23 11/4/2013 3:08 PM

to spin 360 degrees or leave them stock if you just need a back and forth motion. You can get a RC

transmitter, receiver, and servos fairly inexpensively if you shop around a bit.

I mounted the servo to the gun with a small aluminum mount and tapped threads directly into the nerf

plastic, it seems to hold up okay and the servo easily pulls the trigger.

Step 10: Adding the camera and laser

I got the wireless camera system from a place called China Vasion for less than $30. It doesn't have the

greatest range or quality in the world but its tiny and the price was right. To mount it I just popped into

into place on one of the 'tactical' side rails of the gun. These rails would normally hold various nerf

accessories.

I got the laser pointer from a local pest control place as a free gift type thing. I was having a heck of a

time trying to mount it and I'm pretty displeased with the final result, even though it works reliably. I

simply cable tied a mini servo to push down on the laser button. The laser has a magnet built into the

base of it, so I just glued another magnet to the front of the gun to mount them together. I will have to

come up with an improved mounting method for the next version.

Step 11: Mounting the battery

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9 of 23 11/4/2013 3:08 PM

The main system battery is a 24V 3000mAh 'Battlepack' NiCad. To mount it I machined some aluminum

standoffs on my lathe and then used a strip of polycarbonate to hold it down. Some foam acts as shock

absorbing material.

My mini lathe is my fanciest tool, I got it for $480 and have been pretty pleased with it.

Step 12: Main electronics

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10 of 23 11/4/2013 3:08 PM

To control the drive motors I'm using a Sabretooth 2X10 speed controller from Dimension Engineering.

The receiver is a standard Futaba 7 channel unit. Its tuned for 75Mhz and is legal for ground use.

Step 13: Stiffening the frame

I added some 4" x 0.125" aluminum flat bars across the wheel mount to stiffen the frame up and

hopefully keep stuff from bending. I will be using these are the mounting point for the armor panels.

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11 of 23 11/4/2013 3:08 PM

Step 14: Adding armor panels.

I cut up some more of that 0.1" scrap aluminum to act as the armor panels. The jigsaw does a really

nice job as these and is pretty accurate too if you have a steady hand. Cutting fluid really helps out for

this type of thing, I used a few drops of A-9 aluminum cutting fluid and it literally cuts twice as fast, plus

its easier on your power tools and your blades.

They bolt onto some 0.5" thick polycarbonate triangles that also allow the front and back panels to

slope.

Step 15: The sound system

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(http://cdn.instructables.com/F6L/U6B7/FTM73VQ5/F6LU6B7FTM73VQ5.LARGE.jpg)




12 of 23 11/4/2013 3:08 PM

I like adding sound to things.

Shown here is a pair of 100W speakers I got from a surplus electronics store for $20. I wish I would

have shopped around a bit because I found some similar ones for half the price later on.

The amplifier is from an electric go kart I made a few years back that had a similar sound system. I think

I got it from radio shack originally.

To control the tunes I'm using my old 1st generation iPod nano. The battery is pretty much gone and you

only get about 2-3 hours on a charge but its more than enough for this project.

Step 16: Mounting the speakers

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13 of 23 11/4/2013 3:08 PM

I used a jigsaw to cut the holes in the side armor panels. The cuts were pretty rough around the edges

but the speakers cover that up nicely. :P

Best part is now I can listen to tunes as I work!

Step 17: Camera voltage regulator

The wireless camera runs off 9V nominally, going any higher will probably fry it. I wanted to hook it up to

the main 24V battery so I built this regulator circuit to run it.

Its basically a 9V voltage regulator, a support capacitor, and two diodes. I designed it so that I can hook

both the 24V battery up to it as well as the solar backup system. If the 24V battery dies or the robot

loses power the camera will automatically switch over to the solar power so I can see where it is.

I added this ultimate paint schematic to show the circuit. Since the power supplies (24v battery and 12v

solar) share common ground and are not wired in series you won't ever see 36V. The nature of diodes

means only the side with the highest voltage (normally the battery) will pass through. If the 24V drops

below 12V (really really dead) or gets shut off somehow then the 12V solar will pass through its diode

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14 of 23 11/4/2013 3:08 PM

and the circuit remains powered.

Step 18: Adding a power switch

To turn the tank on and off I'm using a automotive store switch I got for $4. Its rated for 35A so it should

be more than enough for what I need. I mounted it on the bottom side panels between the wheels where

it hopefully will not get switched off accidentally.

You can also see the grounding stud in the polycarbonate motor mount to tie the negative battery wires

together.

Step 19: Wiring

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15 of 23 11/4/2013 3:08 PM

I hate wiring things, I'm not very good at it and I don't enjoy it very much. But it has to be done so...

Here is a shot of the insides, its prettystraight forward and a little messy as I cut most of the wires extra

long just in case. I had to extend the servo wires attached to the guns so I went to the local hobby store

and bought a small roll of 3 conductor servo wire and spliced it to the existing cable.

Step 20: Adding the solar panel

I wanted the solar panel to act as a charger but its only designed to charge 12V lead acid batteries like

you would find in a motorbike or ATV. I'm going to look into building a 24V charging circuit for the next

version.

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16 of 23 11/4/2013 3:08 PM

For now the panel acts with the voltage regulator to act as an emergency backup power system for the

camera in case something goes wrong. If the main battery dies or power is somehow lost the system will

switch over to solar for the camera. That way I can at least see where the tank is and whats happening

to it. I mounted it with adhesive backed velcro which is great stuff for mounting things you might want to

remove often.

Step 21: Wireless setup

These are the parts that let me view the camera from my computer.

The laptop is nice since its mobile but I can use any computer that I install the drivers for the video

capture adapter to.

The silver box is the receiver that came with the camera. It needs a 12 volt power supply to run which

also comes with the camera kit. (not shown)

The black box lets me convert the TV component cables to USB to use with a computer. Its a Sabrent

USB Audio Video Capture Adapter that I got from Tiger Direct.

Step 22: Final product

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17 of 23 11/4/2013 3:08 PM

Post Comment

(/member/Nightingale42/)

Sep 2, 2013. 4:19 PM Reply (CVWT9N4HKZ9J5SV)

(/member/bohb/)

Jan 23, 2013. 7:18 PM Reply (C010KJ3HCB8Q4GR)

1(/member/hunter1125/)

Jun 22, 2012. 12:50 PM Reply (C0G9CKFH3QFIZJP)

There she is, just before her first real test. For the most part it works well but there are some things that

will need upgrading in the future. To see it run check out the video in the very first step. Thanks for

reading!

1-40 of294

Next » (http://www.instructables.com/id/RC-Nerf-Tank/?&sort=ACTIVE&limit=40&offset=40#DISCUSS)

Nightingale42 (/member/Nightingale42/) says:

Could you combine this with the Nerf Sentry

Gun (http://www.instructables.com/id/Nerf-

Vulcan-Sentry-Gun/) to create a deployable

sentry turret you could drive to a location and

set up?

bohb (/member/bohb/) says:

Can you please post a parts list?

hunter1125 (/member/hunter1125/) says:

Does the nerf gun have a "sloppy" trigger (hard to pull back) or a "hair" trigger (easy to pull back)? I

am trying to build an rc turret and use an airsoft gun with a relatively light trigger pull, but the servo I

am using seems like it doesn't have as much power to pull back the trigger.

(/files/deriv/F17/3H11/FTM72PPO/F173H11FTM72PPO.LARGE.jpg)




18 of 23 11/4/2013 3:08 PM

(/member/ber2000/)

Sep 19, 2012. 5:04 PM Reply (CNMFODEH742PB6M)

7(/member/travis7s/)

Jun 22, 2012. 1:37 PM Reply (CYHC69TH3QFL73Y)

1(/member/hunter1125/)

Jun 23, 2012. 5:45 AM Reply (CBP4SX2H3QF1CTR)

(/member/weegee13xd/)

May 25, 2012. 2:14 PM Reply (C3O0706H2MYLODU)

(/member/hobbitboy/)

Dec 4, 2010. 8:03 AM Reply (CI3FUKMGH8AGBDE)

(/member/pack77wood/)

May 24, 2012. 9:04 AM Reply (CZDPIZ2H2BMO4KN)


Dec 4, 2010. 10:40 AM Reply (CRX1DGHGH8AAREC)

(/member/m4a1sopmod/)

Feb 15, 2010. 12:43 PM Reply (CGNZRV3G5KP9C47)

ber2000 (/member/ber2000/) in reply to hunter1125

its a soft trigger ive used

before and really easy

depends what type of nerf

gun ur useing?

travis7s (/member/travis7s/) (author) in reply to hunter1125

I can't check because I sold the gun.

But I would say the Vulcan has more

of a hair trigger when running on full

auto battery mode. (since the trigger

is just activating an electric switch)

When you put the gun in manual

mode its tougher because the trigger

has to release a spring.

I was just using a standard Hitec

servo which was rated at about

50oz-in of torque.

Try making the arm that pulls the

trigger as short as possible, it will be

able to transmit more force. For

example, my servo can transmit

50oz-in, so if the arm was 2in long it

would only transmit 25oz of force.

(approx)

hunter1125 (/member/hunter1125/) in reply to travis7s

Ok thanks. I think I might need to

find an electric gun because it can't

pull back a spring that well.

weegee13xd (/member/weegee13xd/) says:

How much would you charge for a complete system minus the computer and the sound system?

hobbitboy (/member/hobbitboy/) says:

what nerf gun is that

pack77wood (/member/pack77wood/) in reply to hobbitboy

VULCAN

travis7s (/member/travis7s/) (author) in reply to hobbitboy

A 'Vulcan'

m4a1sopmod (/member/m4a1sopmod/) says:

where did u get that trigger mechisim and

how much was it




19 of 23 11/4/2013 3:08 PM


Feb 15, 2010. 1:45 PM Reply (CPHGGE9G5KPAQZD)


May 24, 2012. 9:04 AM Reply (CD0WJW2H2BMO4KF)

2(/member/Jedrokivich/)

Feb 11, 2011. 11:10 AM Reply (CEK89SFGJQEK75M)


Feb 11, 2011. 2:29 PM Reply (CLGWGEBGJQE9VKY)

1(/member/%5Bcorosive%5D/)

May 30, 2011. 6:45 PM Reply (CAVO5I3GOB88Y9V)


May 30, 2011. 7:34 PM Reply (CLC93QEGOB87OHU)


May 24, 2012. 9:02 AM Reply (CYMHZ1QH2BMO4K7)

(/member/keeeneth/)

May 14, 2012. 10:52 PM Reply (CBSP5NXH267LCTO)

2(/member/Jedrokivich/)

Feb 11, 2011. 11:19 AM Reply (CXFZCRRGJQEK767)

travis7s (/member/travis7s/) (author) in reply to m4a1sopmod

Its an RC servo. It is a Hitec

HS-311. You can get them

at local RC hobby stores or

at online places like

servocity.com for $9.

pack77wood (/member/pack77wood/) in reply to travis7s

what about home hardWARE

Jedrokivich (/member/Jedrokivich/) in reply to travis7s

You can get 'em cheaper at

hobbyking.com. Their cheapest

one is about $2.

Great shipping prices too.

travis7s (/member/travis7s/) (author) in reply to Jedrokivich

The servo that activates the laser

is actually from Hobby King, I just

happened to have lots of the Hitec

ones kicking around.

[corosive] (/member/%5Bcorosive%5D/) says:

why did you need the black box? was the

camera wireless, or did you have to have it

wired to something, and how was it powered?

travis7s (/member/travis7s/) (author) in reply to [corosive]

The camera itself is wireless, it

runs off a 9v source. It transmits to

the silver receiver box which is

designed to plug into a TV to

display the video. Most laptops

don't have the RCA connectors

that a TV has, so I needed the

black box to convert the RCA input

to USB.

pack77wood (/member/pack77wood/) in reply to travis7s

could you actully hook the camera

up to the tv cause it would make it

alot cheaper for me

keeeneth (/member/keeeneth/) says:

hi do you think it would be possible to combine both a pan and tilt system for the gun?

Jedrokivich (/member/Jedrokivich/) says:

What is the range of your RC system?

Now, the big question: How fast does it go?

adhimahajan (/member/adhimahajan/) in reply to Jedrokivich




20 of 23 11/4/2013 3:08 PM

Mar 3, 2011. 8:20 PM Reply (CKZVTV7GKS0RVMH)

(/member/adhimahajan/)

(/member/badideasrus/)

May 8, 2012. 6:04 PM Reply (COPX16UH1ZG6FA7)

2(/member/urtlesquirt/)

May 6, 2012. 2:53 PM Reply (CNU1IV0H1QMLI5X)

(/member/etm34/)

Dec 12, 2010. 10:39 AM Reply (CX0398DGHFK7LDY)


Dec 12, 2010. 3:38 PM Reply (CWN39TNGHFJXC9Y)

(/member/Furball_Fidelis/)

Aug 4, 2011. 7:11 PM Reply (CHK7S0KGQYG9XSY)

1(/member

/Urrn/)

Apr 5, 2012. 6:59 AM Reply (C8161HFH0KKWSC5)

(/member/Furball_Fidelis/)

Apr 5, 2012. 11:21 AM Reply (CLTUY6CH0KL0W9I)

7(/member/GASSYPOOTS/)

Jan 6, 2012. 7:29 PM Reply (CJUBEA6GX3LWCEH)

(/member/KarateLover21/)

Sep 12, 2011. 4:18 PM Reply (C2OJKO5GSHKU04S)

Its 50 rpm . in the

first few steps he

wrote that

badideasrus (/member/badideasrus/) in reply to adhimahajan

i think he means how fast does it go

forward....

urtlesquirt (/member/urtlesquirt/) says:

airsoft machine gun anyone?

etm34 (/member/etm34/) says:

im thinking about doing this using 2 brushless motors, but im having trouble figuring out what i could

use, anyone have any ideas. will they have enough power?

travis7s (/member/travis7s/) (author) in reply to etm34

I'd stick with brushed technology.

Finding good reversible brushless

controllers can be difficult and

expensive.

Furball_Fidelis (/member/Furball_Fidelis/) in reply to travis7s

not really..Hobbyking.com has some

decent Brushless Speed controls...

some are $100 or less

Urrn (/member/Urrn/) in reply to Furball_Fidelis

Hobbyking.com has brushless speed

controller (esc) for a model airplane

or helicopter for $20 or less

Furball_Fidelis (/member/Furball_Fidelis/) in reply to Urrn

True, but they aren't big enough for a

project this size...need more

amperage....otherwise you'll just fry

the ESC

GASSYPOOTS (/member/GASSYPOOTS/) says:

make it do a barrel roll

KarateLover21 (/member/KarateLover21/) says:

relay = 1.50

servo = 15.00

travis7s (/member/travis7s/) (author) in reply to KarateLover21




21 of 23 11/4/2013 3:08 PM

Sep 12, 2011. 9:31 PM Reply (CZ3X5A9GSI5NKKL)


(/member/jcharbonnet/)

Aug 23, 2011. 6:08 PM Reply (CM9GTEEGROOOOI0)

(/member/sbracco/)

Jul 30, 2011. 12:46 PM Reply (CKMSQMJGQQ5KQYI)

13(/member/sub893/)

Jul 3, 2011. 6:10 AM Reply (C4M6E34GPBD4KZ9)

(/member/pitla_james/)

Jun 28, 2011. 5:51 PM Reply (CC5JGS3GP7IFPG0)

1(/member/deqwer/)

May 29, 2011. 4:26 PM Reply (CD2O16VGO9ST7KO)

8(/member/Chowmix12/)

May 29, 2011. 3:24 PM Reply (CY5N5QFGO8DCA7O)

1(/member/playpep/)

Aug 25, 2009. 4:21 PM Reply (C0Q3DWFFYIZHDYK)

(/member/adhimahajan/)

Mar 3, 2011. 8:12 PM Reply (CUSQXUAGKS0RVM7)

Yes but how are

you going to send

the fire signal to

the relay? The

servo has circuitry

to use the signal

from the receiver.

Also you get can

servos for <$5

these days.

jcharbonnet (/member/jcharbonnet/) says:

what servo u use

sbracco (/member/sbracco/) says:

You should've wired it to the gun. The servo was a good idea too though.

sub893 (/member/sub893/) says:

can you use the vulcans tripod instead of the turret and mount it at 1 place?

pitla_james (/member/pitla_james/) says:

how do you control the tank,what did you use as a controller

deqwer (/member/deqwer/) says:

at least you hide the switch inside or something just don't let your enemy found it so easy.

Chowmix12 (/member/Chowmix12/) says:

Hell March FTW!

playpep (/member/playpep/) says:

i want to build a 1/4 scale rc tank.. how do you wire the motors. and how does the steering work.

adhimahajan (/member/adhimahajan/) in reply to playpep

you can buy the motors ,chassis ,

wheels , battery , wireless

module(evrything) From

robokitsworld.com . Choose the ps2

controller take the 54.68 dollar one

and NOT the 39 one as it doesn't

have the motor driver.

zack247 (/member/zack247/) in reply to playpep




22 of 23 11/4/2013 3:08 PM

Dec 13, 2009. 1:48 PM Reply (CXZI7F1G33OTMCL)

22(/member/zack247/)

Post Comment

i think its much

like a tank, to turn

right, the right

motor turns off,

and the left keeps

going, and so on

1-40 of294

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