Instructables
Picture of Make a prop M134 minigun (from junk)
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This is likely to be the last of the big weapons for a while. I am running out of scrap to make them with!

This was simply an exercise to try and build a non-functional (but rotating) minigun prop for a stills shoot. It basically uses up all my remaining odds and ends of PVC pipe.

The methods and materials I have used are simply because that is what I had in the workshop. I didn't want to spend any money on this project if possible.

YouTube video of the gun spinning can be found

HERE
 
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Step 1: The barrels

Picture of The barrels
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Without a doubt the defining feature of the minigun is the six barrel Gatling arrangement. I sourced as many images of the variants of minigun in existence as well as few imaginary ones. I also found some diagrams and drawings.

The main components of my barrels are lengths of PVC tubing used for plumbing and cable trunking. Unfortunately none of them were long enough individually to match the correct barrels so there are 6 lengths of 20mm tubing, and then 6 lengths of 15mm tubing to form the barrels. The central shaft is made from a length of 25mm conduit.

I began by cutting and cleaning up the pipes. I laid out the cleaned up sections and checked they were all the same length.
Next comes the barrel spacers. I used two card templates and carefully drew and marked up the spacers. These were then cut out and I looked around for two plastic tubs of similar diameter. I poured resin into the tubs to a depth of about 1/4" or 6mm and left them to cure.

Step 2: Spacer assemblies

Picture of Spacer assemblies
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Once I had the two cured resin 'pucks' I glued the templates to them, gave them a coat of resin to protect them, then carefully drilled out the holes and cleaned them up.

These two spacers then formed the masters to cast the rest. I needed three of the smaller and three of the larger sizes to complete the barrels.
Afro Ninja3 months ago

Nice! I'm thinking of going as a battle mech this Halloween and this would be perfect for it! Thanks!

anissen28 months ago

looks awesome, Im planning on making one of these for the Call of Duty Cosplay i do & was wondering if u had a list of all the supplies and pvc deminsions u used?

Terranan2 years ago
old game joystick would work, too...
noctisEQ2 years ago
My minigun is based off the much larger M61A2 Vulcan so the barrels a little longer than yours. I trying to button this project up but the 20v drill motor isn't strong enough to run the gun while inside the body. It can run it while outside the body. But once its bearing any kind of weight it doesn't want to turn. My current set up is with the drill motor mounted in the back of the body tube with one brace at the very front. The shaft of the barrels goes through the front brace and right to the motor. Basically there is the motor and one brace. Do you think the problem is lack of braces, bearings, and the fact the motor is supporting the weight of the barrels? Do you think I can mount the motor in the ammo feed tube instead? What and how would I use as a drive belt?

Your work is top-notch and I was just hoping you could allow me some insight into this problem. Thanks.
marshon (author)  noctisEQ2 years ago
I think that trying to supportvthe barrels with the motor is your problem.
I used the centre shaft of the barrels and ran them right through the body supported by 6 bearings, three at the front and three at the back. The shaft is held in place with an 'O' ring at the front and the back.

I mounted my motor in the tube that would have been the real motor housing and used a Hover belt as a drive belt from the motor, round the centre shaft in the very front of the body. That way the only strain on teh motor is rotational and the bearings take all the strain.
Thanks so much for the quick reply and idea. It will really help me a lot!
mtesta3 years ago
How long are the tubes for the barrel?
marshon (author)  mtesta3 years ago
I did a best 'guesstimate' from some drawing I found on the net.
l8nite3 years ago
I've been thinking about a ped mounted machine gun for the bed of my pickup for a while, I was really thinking about a 50cal but this would be over the top.. great looking gat and a really well done "ible" thank you for sharing !
marshon (author)  l8nite3 years ago
Thanks for the nice cpomments.
tchitwood3 years ago
Very nice! So realistic looking!
nigandjules3 years ago
It's amazing how you make sure realistic stuff out of basic ingredients.
I am Heavy Weapons Guy and this is my weapon