MAKE: Noise — Discuss this article

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• Anybody still out there?
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  I just got Make first yer collection and am looking for some clear PVC. Anybody got some to sell?
  
  thanks
  ~eriC

  Posted by kid_entropy on February 07, 2007 at 19:09:46 Pacific Time

• Need Help
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  Hye guys, for some reason i dont know why, but i cant get the last three pages on the directions. what do i do after i put the PVC pipes together? is there a way i can get the last directions?

  Posted by djbj353 on April 18, 2006 at 17:22:01 Pacific Time

• I have PVC for sale
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  Hello All,
  
  I purchased Schedule 80 Transparent PVC from McMaster-Carr for this project -- but I have a lot left over:
  
  Four feet of the 2inch diameter
  
  five feet of the 3inch diameter
  
  $125 for it all -- this is only covering my costs; no mark up at all.
  
  Ideally, I would like to sell this to someone in the Seattle area. You pick up, cash only please.
  
  Please email if interested
  potatogunannie@yahoo.com

  Posted by ElizabethP on December 16, 2005 at 10:19:10 Pacific Time

• Looking for clear pvc
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  I'm going to make one of these for a christmas gift. Anybody have leftover transparent pvc that I could purchase? If not, anyone else interested in going in on some?

  Posted by 501Vertigo on November 26, 2005 at 08:41:04 Pacific Time

• Have xtra clear PVC (SF bAY arEa)
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  Hi Guys,
  
  I took the plunge and bought the whole 9 yards (OK, 10ft) of clear schdule 40 PVC, both 3' and 2'.
  
  It is available for cost to other Make fans in the SF Bay area.

  
  If you want it, post here, and we'll figure out some way to hook up.
  
  Cheers,
  
  secrat

  Posted by secrat on November 03, 2005 at 07:49:32 Pacific Time

• Have xtra clear PVC (SF bAY arEa)
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  Hey secrat! I live here in the Bay Area! I'm a prop maker for a theatre dept up in Santa Rosa but I'd be more than willing to make the drive anywhere in the Bay Area if you still have the transparent PVC available, It's the crucial ingredient for my little anarchist ck bk. let me know!

  Posted by foravalon on June 05, 2006 at 11:16:14 Pacific Time

• schedule 40 transparent pvc pipe
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  i was looking to make this project but the clear pvc pipe is expensive and can only be ordered in lengths of 8 or 10 feet. is anyone interested in buying the extra pipe that i will not use?
  
  thanks
  

  Posted by botoboss on October 11, 2005 at 13:44:33 Pacific Time

• schedule 40 transparent pvc pipe
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  Hello -- I would be interested -- where are you located? I would be happy to pay the shipping and a bit extra for your trouble.
  
  Thanks,
  --ElizabethP

  Posted by ElizabethP on November 17, 2005 at 10:43:00 Pacific Time

• schedule 40 transparent pvc pipe
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  Do you have any clear PVC left? I'd pay cost and shipping to Tucson AZ.
  
  Regards,
  Lon

  Posted by Lonreeder on November 05, 2005 at 17:29:31 Pacific Time

• t-shirts?
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  can I shoot a t-shirt with one of these, or do I need to go with a compressed air shooter?

  Posted by andyknas on October 03, 2005 at 18:36:18 Pacific Time

• clear pvc sources
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  I'd like to make one, but spending $100 for each piece of PVC from mcmaster-carr (8' piece) makes it a little more expensive. does anyone know where to get just short pieces?
  
  Great tip on the BBQ igniter!

  Posted by andyknas on October 03, 2005 at 18:32:11 Pacific Time

• miss fire
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  I had so much fun making this spud gun. Instead of hose claps I used velcro to attach the stungun to the cannon. I thought it made a nice touch
  
  When it can to firing time, I used the soft foam balls instead of the potato because I live in the suburbs and didn't want to kill any of my neighbors (I liked them for the most part). All the kids on the block gathered around, and Dad was feeling like Rambo, but instead of going the advertised 2,000 yards mine
  only shot 200 inches, or it never fired at all. Needless to say the kids where not impressed.
  
  What did I do wrong!? I followed the instructions to a tee. The only difference that I could think of is that
  I used scented rightguard instead of unscented.

  Posted by marcel.grenier on August 25, 2005 at 20:55:45 Pacific Time

• miss fire
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  1) your ammo is too light and the air drag is too big 2) when the foam is compressed by the ignited aerosol gases it gets wider with respect to the diameter of the tube (like a marshmallow squeezed between your fingers) so it has greater friction with the barrel's wall.
  
  Here's an experiment you can do in your head to prove that the ammo is too light. Drop a BB and a feather of the same weight at the same time and which hits the ground last? Now throw the BB and feather into the air and see which one stops and begins to return to the ground first. The feather. The basic form of Newton's theory of gravitation is swell for two balls falling from the Leaning Tower of Pisa, but for many other pairs of objects of the same mass you need to have them fall through a vacuum where there are no air molecules to apply aerodynamic drag.
  
  I like the idea of soaking foam projectiles in water. Be warned: water can hurt too. When I last played with one of those water ballon launchers constructed with surgical tubing my buddy (6'4" 200 lbs) got hit with a waterballoon and got knocked down and had serious bruising and a huge welt.

  Posted by palewiz on January 14, 2006 at 03:24:08 Pacific Time

• miss fire
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  Hiya -
  I haven't tried this project myself (yet), but have heard that it might take more than a 1-2 second burst of aerosol; you might want to try more gradually and see what works best.
  -t
  

  Posted by terrie on August 29, 2005 at 13:53:28 Pacific Time

• Better Ammo
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  I've found that cheap foam balls (get them by the bag at Toys-R-Us) soaked in water make awesome spud-gun ammo.
  
  They're easy to load, and compress and seal to the barrel during launch, so all you hear is a dull "thomp" -- most of the energy goes into launching the projectile. And they're reusable (assuming you can find the buggers).
  
  Plus, if you accidentally hit something (or someone), they won't cause (much) damage. Thoughtful, when you consider you might be bombarding something 2 subdivisions over...

  Posted by MadOverlord on July 26, 2005 at 22:11:26 Pacific Time

• Stun Gun replacement?
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  I live in Massachusetts, one of the few states that cabelas will not ship stun guns to. And the only other state I could have an order shipped to is New York (also on the no ship list).

  
  

  Does anyone know if I could use something other than a stun gun to provide the spark here? I've seen some plans that call for a gas grill lighter. Is there any reason that these plans call for something with a '100,000 volt output or better'?

  Posted by swillis on July 25, 2005 at 11:27:26 Pacific Time

• Stun Gun replacement?
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  There's no need for a 100,000 volt power supply. A gas barbecue igniter works just fine (When I built a potato gun I got the igniter at goodwill for 69 cents).
  
  Anything that produces an electrical spark, is enough to ignite aerosols like hairspray.

  Posted by jason222 on August 15, 2005 at 17:50:13 Pacific Time

• Stun Gun replacement?
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  I've used the BBQ igniter with much success. If you drill a hole in the drain cover at the bottom it works great! I love making potato guns, i've even made some pnumatic ones, i'm going to try to make a t-shirt launcher next.

  Posted by sasimpson@gmail.com on August 26, 2005 at 13:45:44 Pacific Time

• Stun Gun replacement?
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  It could be that aerosol has a higher ignition threshold and needs more volts or heat but I really doubt it since most of my experiece with explosive fuels such as alcohol acetone and gasoline or lighter fluid exposed a problem of atomization eg no spray just dribble that started working better after the first few firings
  so yeah use that little red button clicker off the grill if it doesn't work at first try dry firing it with a match to heat up the cylynder and i never recomend anything but alcohol since that what my 7th grade prof mr longmuir said would keep us out of the hospital since alcohol is less volatile

  Posted by NHDEdmands on July 31, 2005 at 15:14:52 Pacific Time

• Stun Gun replacement?
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  We use to use an friction lantern lighter, for propane for camping lanterns.
  Like this:
  http://image.basspro.com/images/images2/600-000/645-828-00.jpg
  
  Or a push button starter BBQ lighter, available at any K-mart, Walmart, Target etc... for about $10.
  
  

  Posted by BoorT on July 25, 2005 at 15:03:41 Pacific Time

• gun wont fire
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  i recently built a gun after receiving plans over the net. When firing I noticed the gun wouldnt ignite. The gun is 3'' reduced down to 1.5'' for the barrel. I also tried aquanet hairspray with a potato for ammo. My ignitor is a bbq ignitor. Push the red button, nothing happens. Any suggestions?

  Posted by jbro300 on June 07, 2006 at 14:56:02 Pacific Time