Introduction: Gas Pipe Flashlight

This instructable will show you how to build a LED flashlight.

Step 1: Tools and Materials Needed

Tools
Soldering Iron
Hot Glue gun
Nail clippers
Wire strippers
Marker

Materials
1/2" Pipe Cap
4.5" x 1/2" Threaded Pipe
1/2" to 3/4" Pipe adapter
Perforated circuit board
Spring
Wire
Solder
Hot glue sticks
10 5mm LEDs
Sheet of foam
Shears or Dremel with cutting wheel

Step 2: Cut the Perforated Circuit Board

Cut a circle out of the perforated circuit board that will fit inside the pipe adapter.

Step 3: Dry Fit the LEDs

Put the LEDs into your circular circuit board to see how they fit.  Then trim the LED leads and leave the longer lead slightly longer.

Step 4: Solder the LEDs

First solder the LEDs to the circuit board.  Then solder all the positive and all the negative LED leads together.  Test your LED board with a 3 volt power source to make sure you have soldered the LEDs correctly.

Step 5: Create a Spring

Create a spring for the flashlight.

Step 6:

Screw your LED board into the steel adapter.  Leave an uninsulated wire connected to the negative connection of the LED board hanging so it makes contact with the steel adapter when screwed in.

Test your connections.  If it is working properly make a contact with a washer and some solder.  Fill the area behind the contact with hot glue.

Step 7:

Cut some foam spacers that go between the battery and the contact point.  The spacers create a switch that is on when the adapter is tightened.

Step 8:

Tweak the number of foam spacers so that the flashlight turns on only when the adapter is tightened.

Comments

author
thepuppetman made it! (author)2015-09-25

mine still needs minor tweaks, but pretty good, I'd say.

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author
Nemesistant (author)2012-08-06

Working on making one of these out of copper pipe and then reacting it with zinc to give it a nice brass layer and more of a steampunk look.

author
tyler303047 (author)2011-08-31

YAY something that can show you path AND maim someone.
jk a very very useful instructable.

author
snowluck2345 (author)2011-04-25

try bringing this on an airplane

author
Nyanman (author)2011-02-17

sweet!
both a flashlight AND a holdout weapon.
seriously, how much does it weigh?

author
kurshiukas (author)2010-08-13

Its awsome!!!!!!!!!!

author
Wasagi (author)2010-08-08

Nice, I was toying around with the idea of making something like this with a shower head, but I never go around to it. Nice work!!!

author
DaPope (author)2010-08-07

Very cool, I picked up the pipe yesterday. Just gotta get some LEDs and we're in business. My wife also thinks it's really cool and wants me to make her one to keep in her car!

author
rossjima (author)2010-08-07

I'm constantly crushing, breaking flashlights on the farm. I have to make one of these. What about extending it so it holds more batteries? Would that make it brighter. It would up the voltage for sure but I don't know much about how leds behave and are speced.

author
Skyfinity (author)2010-08-03

http://blog.makezine.com/archive/2010/08/flashlight_from_galvanized_iron_pip.html
 
Congratulations on bing featured on the Make: Magazine blog!!! Way Cool.

author
qxnixrfnaozqqx (author)Skyfinity2010-08-03

Awesome!

author
omnibot (author)2010-07-31

Sweet flashlight, it would really come in handy in those dark nights when someone is following you. A bit of blackpaint and it's done.

author
bombmaker2 (author)omnibot2010-07-31

OW. Could you imagine how much it would hurt to get cracked over the head with this thing?

author
djdole (author)bombmaker22010-08-03

Just like a maglight beat-stick... only more brutal.

author
bombmaker2 (author)djdole2010-08-03

What sucks the most is you could weld on spikes to this one if you wanted to!

author
junits15 (author)bombmaker22010-07-31

just what i was thinking!

author
bombmaker2 (author)junits152010-07-31

I smell concussion(s)!

author
junits15 (author)bombmaker22010-08-01

hahaha

author
bombmaker2 (author)junits152010-08-01

lol

author
ScubaSteve (author)omnibot2010-07-31

Just use black pipe.

author
swinfos (author)2010-08-03

sorta looks like a lightsaber

author
StickStoneBone (author)2010-08-02

This is brilliant in it's straight-forward and effective design.

author
brahmdanger (author)2010-08-01

nm, i didnt realize that the pipe itself was the negative conductor. Here is the one i made. thanks again!  

pipeled.JPG
author

Well done.

author
brahmdanger (author)2010-08-01

this is an awesome idea, im currently trying to biuld a flashlight just like this but im having trouble completing the circuit on the negative end of the batterries, could you post more details about how you wired this? Thanks for the great instructable!

author

The trick is to conduct electricity from the negative terminal of the battery through the flashlight. This is done by putting a spring inside the case which touches the negative side of the battery to the steel case. Diagram attached.

additionalnotes.jpg
author
tokymaru (author)2010-08-01

.....can anyone say pipe bomb?

author
korgoth25 (author)tokymaru2010-08-01

pipe bomb. ther i said it are you happy now lol

author
tokymaru (author)korgoth252010-08-01

Little bit, yeah.

author
lemminggenocide (author)2010-08-01

I dunno, looks kinda flimsy XP (for anyone thick enough that was a JOKE!)

author
EmmettO (author)lemminggenocide2010-08-01

Yeah and really light and portable.

author
Nucleus (author)2010-08-01

Neat design

author
GunRunnerX26 (author)2010-08-01

Very cool and almost steampunk. I think I know what I am going to make.

author
junits15 (author)2010-07-31

very cool!

author
craziemutant (author)2010-07-31

Looks awesome! ...And kind of like a light saber. haha.

author
Culturespy (author)2010-07-31

Talk about industrial strength! Nice job!

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