Having played the highland bagpipes for a couple years now and having just finished a course on maintenance, I was greatly interested in building my own set of pipes just for fun. A few days later, a duct-tape and CPVC bagpipe emerged!
Assembly (from having taken out the parts to having a playable instrument) takes roughly 4-5 hours.
Here's a video of me with my second iteration of PVC bagpipes! Among the improvements are a freshly crafted duct tape bag, valves and a screw tuner for the drones, and CPVC drone stocks instead of vinyl tubing.
(Just a side note... the drones were HORRENDOUSLY out of tune in this video. They can sound better, really!)
And just for fun, here's an earlier video of me playing the Star Wars theme on them (before we added the bag)
Step 1: Parts and Tools
For each of the drones and the chanter (i.e. one drone or chanter = one set of these parts. My pipe had a chanter and two drones):
1/2" CPVC pipe, variable length
3/4" CPVC Cap
3/4" CPVC Coupling
3/4-3/4-1/2 CPVC Pipe T (the 1/2" comes out the side)
3/4" CPVC pipe lengths - two 1" cuts and a 1.5" cut. For the drones get an additional 6" cut)
A few squares of plastic bag, roughly 2" by 2".
Waxed hemp or regular masking tape
For the bag:
4X 2" lengths of OD vinyl tubing
For the blowpipe:
2' OD vinyl tubing
Parts listed in my Check valve instructable
A sharp knife
Drill (preferably a drill press)
You'll End Up With:
1 Duct Tape Bag
1 Bass Drone
1 Tenor Drone
1 Blowpipe + Check Valve
Which can then be assembled into a set of smallpipes!
Step 2: The Drones
Drones (and the chanter) make sound by vibration of the membrane (the plastic bag). With the bag stretched taut around a 3/4" pipe, the 1/2" body pipe is slid inside and contacts the membrane. When air is blown into the 3/4" pipe, it travels up, past the membrane, and into the 1/2" pipe. This causes the membrane to vibrate!
In case that was a bit too brief, an excellent demonstration and assembly video can be found here - kudos to this guy for inspiring me to make my own pipes!
To assemble a drone, cut two small sections of 3/4" pipe and put them on either end of the pipe T. Also cut a long 1/2" section for the main drone piece. Be sure to make this extra long, since when we tune it up we'll be cutting it down.
Try sliding the 1/2" tube into the tee until it's flush with the opposite side, and put some hemp on it where it just begins to enter the tee. This will force the air up into the flush side and make the membrane vibrate.
Now stretch your membrane over the flush side and cap it lightly with the 3/4" coupling. Be sure the membrane has no wrinkles or holes, as these greatly diminish sound quality. Try blowing into the 1/2" part of the tee and slightly adjusting the 1/2" drone length against the membrane until you get a solid drone. You'll know it when you hear it.
If this sounds a bit too loud for your tastes, you can add an additional 3/4" section and a 3/4" cap to the coupling that secured the membrane. I usually cap my drones, but leave the chanter open. This gives an even sound overall.
Now for proper tuning. I made two drones - one tuned to low A, the other an octave above. Grab a guitar tuner (or find a tuner app for your phone) and blow on the pipe to see what frequency we're at. If it's too low, chop off some of the 1/2" drone length to raise the pitch. Small adjustments are needed - as little as 1/4" can change the pitch significantly.
When you've got the tuning exact, chop off just a little bit more - this'll make it tune slightly high, but also means we can tune it with another pipe section. I found that a 3/4" CPVC length around the end works best to tune the drones - simply slide it out to decrease the pitch or bring it back to increase. You can also do some fancy dremeling on the end of the drone to allow air to escape in case you accidentally cover the end (e.g. poke it into the sofa or your leg).
Step 3: The Chanter
we fake it! I had a practice chanter lying around (if you don't you can get one from amazon) and I copied the holes onto some 1/2" pipe using a drill press. The membrane assembly is exactly the same as for the drones.
If you get a note too low, scrape away at the hole with a pocketknife or dremel heading towards the membrane section. This will raise the pitch. If it's too high, you're not screwed - just cover the hole over slightly with electrical tape.
Step 4: Duct Tape Bag
As a side note - I used 1/2" OD vinyl tubing for my bag stocks on my first iteration, but I highly advise using 1/2" CPVC instead. The vinyl compresses when you try to put the drones and chanter on, and are kind of slippery compared to a snug CPVC fitting.
I started off by making a big flat sheet of duct tape - lay one strip down sticky side up, then place one halfway up sticky side down. Flip and repeat until you get something roughly 23" square.
Then fold the sheet over halfway, draw your bag outline, and cut it. Try to get the seams to match up as seamlessly (heh) as possible. For mine, I drew a straight line for the bottom of the bag about 12" long and a chanter neck about 4" long and 2" high, then eyeballed the rest and joined them with a curve.
Cut your stock pieces (roughly 2-2.5" apiece) and line them up with where you want them to go. On my new bag, I have three on top spaced roughly 1.5" apart. The blowpipe goes in front, then the tenor drone, then the bass drone, but really you can place them anywhere that's comfortable for you.
Next, insert your stock pieces. DO THIS BEFORE YOU SEAL THE BAG. It may seem obvious, but it's easy to forget, trust me. The stock pieces can be secured with duct tape again, but make sure you have a tight seam especially inside the bag because it's quite the pain to re-seal them if there's a leak.
Finally, close up your bag by taping lightly around the seam. I guarantee you there will be air leaks, so blow into the bag, find a leak, duct tape, and repeat. You do this without the drones on by putting some tape over each stock hole while you test it.
During play the bag will also start to leak initially. Just stop playing, grab your duct tape, and get fixin'.
Step 5: The Blowpipe
I have another instructable specifically for this since it's probably the most fiddly bit on the instrument. Check it out here!
Step 6: Assembly
Step 7: Maintenance
The Leaky Bag: Sometimes, particularly when your pipes are freshly made, the bag is going to spring a leak. This will most likely occur around the seam, but it can pretty much happen anywhere. The solution? Add more duct tape. No, seriously - you'd be hard pressed to add enough duct tape to a bag to the point where it's unusable. I usually tape the hole with at least 2" of cover on any side, and I try to wrap around the bottom to the other side so there's some tension on the tape.
Slippery Drones: If your drones start having pieces fall off, it's time to add some more masking tape or hemp. This can be particularly annoying at the 3/4" drone ends and the cuff holding the 1/2" pipe into the T, since those both determine the pitch of the pipe, but adding tape regardless will make the fit more snug and prevent bits from a-hobbling off.
Raspy/Gargling Membrane: If your membrane starts sounding a bit rough or if you hear some gargling sounds, try re-stretching the plastic bag membrane over the 3/4" section. This is usually because the bag is either not tight enough or is worn out.
If re-tightening the membrane doesn't do it the first time, do yourself a favor and don't keep trying to tighten it. Plastic bags are cheap, so go ahead an slaughter one in the name of the bagpipe gods so that they might bless your instrument of destruction.
Step 8: Upgrades!
This amounts to basically installing a choke valve inside your pipes. I tried using a ball valve between the bag and the pipe to limit airflow, but this significantly decreased loudness and didn't prevent that much air from escaping. What I found worked best was actually a whittled-down rubber roller from an old printer I disassembled, but I'm sure any rubber washer you can find at Lowe's would do the trick.
Simply take your rubber washer and cut it down on the edges until it fits the inner 1/2" pipe with a bit of friction. Slide it just a little bit down the top of the pipe so the membrane doesn't it hit. This works for both the drones and the chanter by keeping the membrane area under high pressure, while having a smaller hole for the air to escape through.
This upgrade is a bit more complex - for each of the drones, I bought a 3/4" threaded male and matching female coupling as well as a 1/2" to 3/4" adapter. Bore out the inside of the adapter so the 1/2" pipe can slide though it with some effort, then slide the female coupling onto it. Then add the male coupling to the outer area so that the long 1/2" CPVC section can be threaded into place.
This was most useful in maintaining the right tuning and in making precise changes - the threading and snug fit to the 1/2" pipe prevents accidental bumping from affecting the tuning of the drones, and if you need to increase or decrease the pitch all it takes is a simple tightening/loosening of the two couplings.