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Old 03-11-2012, 10:29 PM #1
molybdenum
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home made paintbow.



I used the actual forward motion of the string to propel the ball. It works kind of like a sling shot.

Balls are muzzle loaded and the string is drawn, then fired. I haven't chronoed it, but I would guess it shoots high 100s to low 200s.

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Old 03-11-2012, 10:56 PM #2
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Thats awesome!
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Old 03-11-2012, 11:18 PM #3
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that's awesome dude!!

If you're looking for any pointers I try would putting a detent (homemade or otherwise) at the back of the tube so you can run around without the ball rolling forward.

None the less very nice!!
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Old 03-12-2012, 01:14 AM #4
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that's awesome dude!!

If you're looking for any pointers I try would putting a detent (homemade or otherwise) at the back of the tube so you can run around without the ball rolling forward.

None the less very nice!!
The problem with that is that if he's loading the current way, the ball wouldn't get behind the detent in the first place.
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Old 03-12-2012, 10:25 AM #5
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Yeah, I've really struggled with how to load this thing. Originally, I planned to have a ball in my draw hand and place it in the tube via an opening, but it proved to be to difficult to manipulate a ball while holding a string back and with fingers constrained to either side of the tube. Ideally id use some kind of loading tube magazine, but I'm still not sure how i would do that because:
1) with out a stopping mechanism, a ball would drop every time the string passed, both forward and backward, thus I would lose a ball out the back for every one I fired,
2) I putting the tube somewhere conducive to a stopping mechanism that would be easy to use and withing my ability to make would interfere with the draw.

If anyone has any suggestions, that would be great.
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Old 03-12-2012, 10:35 AM #6
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Now thread it and drop in a barrel kit!

In your video I noticed that you made two cuts down the length of the tube. I'm assuming this is if you ever change draw hands and then can flip the boa and adjust what side the string is on to make it the easiest?

For the loader, you could try a spring loaded magazine style that you could attach to your bow and make it have a little tray that you can push/pull to block the paint in the magazine when you fire.
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Old 03-12-2012, 10:42 AM #7
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Now thread it and drop in a barrel kit!

In your video I noticed that you made two cuts down the length of the tube. I'm assuming this is if you ever change draw hands and then can flip the boa and adjust what side the string is on to make it the easiest?

For the loader, you could try a spring loaded magazine style that you could attach to your bow and make it have a little tray that you can push/pull to block the paint in the magazine when you fire.
I don't have to flip the bow to change draw hands. The string runs down the center of the tube, so its only slightly more awkward to fire left handed due to the tube being on the left side of the bow.

I'll have to try the tray thing.
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Old 03-12-2012, 12:16 PM #8
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Yes, mount a magazine in the back with a sliding door. You can grab the door as you are drawing the string which would drop a ball in and then the sliding door would spring back to closed. The ball would drop in behind detents
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Old 03-12-2012, 02:10 PM #9
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I can throw together a quick rendering of my idea and a tray design if you'd like. It's made from 3/4in PVC piping, correct? How's the accuracy at a longer range?

Also, what if you drilled a hole in a bolt (such as a spyder delrin since they're cheapish) and string the bow through the bolt?

P.S. Now you can relive those great memories of Cowboys vs. Indians!
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Old 03-12-2012, 06:30 PM #10
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I can throw together a quick rendering of my idea and a tray design if you'd like. It's made from 3/4in PVC piping, correct? How's the accuracy at a longer range?

Also, what if you drilled a hole in a bolt (such as a spyder delrin since they're cheapish) and string the bow through the bolt?

P.S. Now you can relive those great memories of Cowboys vs. Indians!
Its actually 1/2 inch pvc, but its some absurd wall thickness so the ID is like .700.
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Old 03-12-2012, 06:43 PM #11
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Interesting. Guess you had to go to a specialty store to find that?

Since I have nothing else to do for now, I'll throw together a render to help you visualize my idea. And I might do one for what cpt is thinking.
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Old 03-12-2012, 08:22 PM #12
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Interesting. Guess you had to go to a specialty store to find that?
Nope. I actually found it in the plumbing section at Menards.

In fact, that was the inspiration for this project. I was there fore something else, and I noticed roughly-paintball-sized pipe, so I bought 10 feet of it (cost like 98 cents) knowing that I'd find something to do with it. Since then I've used it for stick feeds and barrels, as well as uper cheap 10 rnd tubes.
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Old 03-12-2012, 09:50 PM #13
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Here's a render I just completed:



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Old 03-12-2012, 10:11 PM #14
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Its actually 1/2 inch pvc, but its some absurd wall thickness so the ID is like .700.
Are you sure its 1/2 inch- how would a .68 paintball fit in it? or are you using .50?
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Old 03-12-2012, 10:36 PM #15
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Are you sure its 1/2 inch- how would a .68 paintball fit in it? or are you using .50?
Its labeled 1/2 inch, at least. It has the same OD as normal half inch, but the walls are really thin. I am using normal .68 paint.
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Old 03-14-2012, 05:44 PM #16
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Well then in my render I made my tubing and spring a little too large (diameter wise), but it doesn't make much of a difference overall.

But the idea shown in the render is that you could have a "magazine" that'll hold 6-8 paintballs (or more if you decide to make it an ultra long mag). And you would release the paintballs by pulling down the lever to raise the "door" which would allow a paintball in by being gravity fed or pushed by a light spring.

There may be chance of double feed, but you wouldn't have to worry about any chop since it's all powered by the bow instead of a bolt and air. Your overall accuracy may decrease if two were shot at once, but you have twice as many chances to hit a target also.

If you'd like the dimensions I used in the render, just let me know and I'll be happy to send them anyone's way.
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Old 03-14-2012, 05:51 PM #17
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you need to load the ball in the back dude from a door that you can close, that way it gets behind the detent
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Old 03-14-2012, 05:55 PM #18
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you need to load the ball in the back dude from a door that you can close, that way it gets behind the detent
The door can close. If you place it all the way in the back, then you'd have to worry about it rolling back out when you draw the string back. Or the paint would end up behind the string and be completely useless. He cannot use a top or bottom feeding mag because they would be in the way of the drawstring of the bow.
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Old 03-14-2012, 06:37 PM #19
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you need to load the ball in the back dude from a door that you can close, that way it gets behind the detent
I don't think I will be able to add a magazine far enough back to be behind a detent without compromising the integrity of the tube. As it stands, the velocity is so low that I have to angle it up anyway if I want to hit anything more than about 15 feet away.
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Old 03-14-2012, 09:25 PM #20
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You could use the cheap spyder rubber detents. The diameter isn't very large and a hole can easily be drilled into the side of the tube. You wouldn't even need two detents.
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Old 03-14-2012, 10:06 PM #21
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You could use the cheap spyder rubber detents. The diameter isn't very large and a hole can easily be drilled into the side of the tube. You wouldn't even need two detents.
The detents wouldn't be a problem. The stick feed is what I'm worried about.
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