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Update page 3: Homemade ammo belt!

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#26 MithMorchaint

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Posted 19 July 2007 - 11:09 AM

The person who suggested using magnets to advance the darts in the drum had a good idea, just not designed practically - as was stated, the force would be all screwy and you'd have to advance the trailing magnet anyway. Since I'm in the middle of building a railgun/coilgun, I've been doing ALOT with magnets lately and have an idea as to how a magnetic loader could be achieved.

When you create an electromagnet by coiling wire around, say, a piece of PVC, and then running current through it (9V batteries work well, but AAs are also possible), the magnetic field is actually directional. Meaning, if you were to place a piece of metal in it it will simply be suspended in the air in the middle of the coil (it's pretty cool, we've suspended finishing nails inside a straw), but if you place a magnet in it it will launch out one end. Since this force is constant, you would just need to figure out what direction the field goes, then attach a magnet to the bottom of the dart advancer. It would be pressed forward with a constant force, since it cannot accelerate and gain any momentum.

The only real trick with this would be making it move circularly. I have a design that I think would make this work (a variation on Fenixharth's design using the electromagnet/magnet idea instead of a spring) but it is hard to describe, a picture would work better. Will draw one up when I get home.

The only limit to the practical application of a magnetic feeder would be battery life - wouldn't want it to crap out in the middle of a battle and have to replace the (somewhat expensive, in quantity) batteries. Reloading, on the other hand, would be a snap. Reverse the current to draw the loader all the way to the back, then simply drop the darts in.


Edit: In thinking further about this, I realized a further benefit; no limit to how big the drum could be. It would work equally well with 10 or 100 darts.

Edited by MithMorchaint, 19 July 2007 - 11:10 AM.

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#27 Trace II

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Posted 24 July 2007 - 09:18 AM

I talked to my friend about this and he suggested servos (small precision motors). What do you think?
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#28 Trace II

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Posted 24 July 2007 - 09:18 AM

Double post. Browser problems

Edited by Trace II, 24 July 2007 - 10:31 PM.

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#29 ambushbug

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Posted 24 July 2007 - 09:58 PM

[/quote]
I would use a Torsion spring (they donīt wear out or become brittle as fast as rubberbands)this type of Spring is used in Mousetraps.

[/quote]



I am very intrigued about the drum-mag as well. I had tried a few things out but it never materialized (I'm clearly not as determined/clever as you are). In terms of spring ideas, I pulled apart a cheap timer (kitchen counter-top style) that I bought at the dollar store. It might be similar to the "pull-back" toy car or "wind-up" toy idea you mentioned - maybe it might provide what you need.

I'd also love to see the finished prototype in action (e.g. a video). Good work!
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#30 Z-man12

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Posted 24 July 2007 - 10:40 PM

Bravo on the drum mag. I know that this is really a difficult subject to nail down. I have been working on one for a while and I think when I get it done it will be incorporated into a BBB. Might I suggest something to use as a spring. I don't know if you have tried it but what about the lower strings on a guitar? if wound right they would create a low tension spring similar to those used in mouse traps or more closely those used in clocks and tape measures. That’s my two cents, and congrats on making one that works.

Looks like you had the same idea as me on the Titan rockets made from noodles as well. Let us know how they come out.
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I mod nerf guns so they look good. So leave my scopes, doodads, and trinkets alone I like them. I don't mind the weight and I started out that way on toy guns and its not going to change.

#31 lionhead333

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Posted 24 July 2007 - 10:58 PM

The retrieval units inspired me, and I began to train my own 2 furry demons. The darts (Blanks, for training purposes) usually end up in the stomach of said units. Once fed laxitives, they shall be ready for field tests.

EDIT: Telekinetic, by 'this evening' do you mean the 25th, since it's just past midnight?

Edited by lionhead333, 24 July 2007 - 11:09 PM.

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QUOTE(Ubermensch)
If I were you, I wouldn't mess with the mods, or make stupid mistakes like misspelling their names. I mean, CAVV is really tough on that kind of thing

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#32 telekinetic

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Posted 24 July 2007 - 11:04 PM

Thanks for all the comments on the drum magazine! Exactly the reason I made this thread is so I would be motivated to finish it, or at least get to a point where the design fails--whichever comes first!

I've got all the supplies...if it works, I'll try to have it being rubberband propelled with a youtube posted by this evening :D
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Frylock is telekinetic, right?

#33 telekinetic

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Posted 03 August 2007 - 08:32 PM

Waiting on McMasterCarr for the drum magazine, but not slacking.

Currently have this pile of leftover parts sitting on my table...hmmm B)

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Frylock is telekinetic, right?

#34 Grenada

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Posted 03 August 2007 - 08:51 PM

Your pile of scraps gave me an idea. take a rf2o or ms, and hook it on to the back. it will give you a place to keep it while you fire a titan.
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If you Nerf in western washington, PM me

So you see a penguin walking down the street. Looks harmless right, so you keep on walking past him. You turn around to seem him walk away, only to find yourself staring down the barrel of a .38 revolver.

#35 telekinetic

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Posted 19 August 2007 - 02:47 AM

So, the lab went under a remodel, and got moved to the wall opposite its previous location (its old spot is being taken up by a Futon)
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However, noone cares about that but me, so on to the mods.

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I made some hornet spacer plates out of acrylic (you can see one on the Hornette), from this pattern. If anyone is interested, I can make a draft document out of it so you can make your own without having to take measurements.

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A quick and dirty PETG-singled Big Blast.

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Anyone who buys OMC PETG needs to invest in a 9/16" spade drill bit...the fit is perfect! I used it on my spacer plates, and just jammed it down the barrel stub to creat the singled BBBB....so tight, no adhesive required! Joy!


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My babies. This is my first step towards the holy grail, a belt fed monster. I have yet to decide if I want to make these belts work with a heavily customized RF20 (not sure how strong the advancing mechanism is) or a lightly modified razorbeast.

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The metal parts are .50 caliber machine gun belt links. I bought 100 links on ebay for $10. OMC PETG is a tight fit in the neck side. There's a decent gap on the middle and rear ring, I might try to find some thin wall PVC that slips over the PETG and is the right size for the other two rings, but it's actually pretty ok being loose.

If anyone with serious mod experience is seriously interested in a couple link samples, I'll happily send them 5 or 10 for the price of shipping...the more people working on this problem, the easier a nut it will be to crack! ^_^

Edited by telekinetic, 19 August 2007 - 02:50 AM.

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Frylock is telekinetic, right?

#36 All Star

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Posted 19 August 2007 - 07:18 AM

Are you getting good ranges with the big blast? I tried modding mine with brass, and the ranges SUCKED!


P.S. I like your cats!

Edited by All Star, 19 August 2007 - 07:20 AM.

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#37 telekinetic

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Posted 19 August 2007 - 12:02 PM

Are you getting good ranges with the big blast? I tried modding mine with brass, and the ranges SUCKED!


P.S. I like your cats!


Yeah, the big blast is basically a singled Titan Jr. I haven't even plugged the overpressure valve and I can put a stefan through both sides of a Pizza box on five or six pumps.
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Frylock is telekinetic, right?

#38 Z-man12

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Posted 19 August 2007 - 01:25 PM

I actualy was thinking of making a belt fed monster out of a RF20 my self how ever my semi-auto/full auto selectable gun (another holy grail) has taken the lead for now in getting done.

I chose the RF20 mostly because its got a lot of power behind its feeding mech.
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I mod nerf guns so they look good. So leave my scopes, doodads, and trinkets alone I like them. I don't mind the weight and I started out that way on toy guns and its not going to change.


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