With the conduit drilled I de burred it, and lightly sanded and now time to design a mouth piece. Looking further into this I found a more involved hole calculator which did the bore length and everything so this is what I used(see screen shots) I used what drills I had to hand for this, what's 0.5 of a mm between friends:) Initially I used a 7mm centre point drill bit to drill the holes and then cleaned the holes out with a de-burring tool and sanded the whole thing lightly, this first prototype played but I needed to cover half the hole sometimes to get the right note so clearly something wasn't right. The next thing I ended up doing was to take a measurement from what would be the mouthpiece end of the conduit to 80mm and marked this off with a pencil, then with a gap of an inch I marked off another 8 holes, I didn't know at this point that I only needed 6 so cut it down to suit. To start off with I'd cut the conduit at 350mm but soon realised that this was far too long so cut it down to 300mm I then cleaned the ends, with a de-burring tool for the inside and sandpaper for the outside, looking online I found a reference to holes on a flute or something being 1 Inch apart so this was my Benchmark, where to start the holes from is going to be purely guess work.įirst of all I needed a straight line down the conduit to mark the holes off, I just took a pencil and held it between thumb and index, finger using the the joint of the 2nd finger as a guide this was ok.ish but I came across a video later of a guy scribing a line down a wooden pole, he placed the pole into one of the grooves on his table saw and then slid a thin board up to it and he scribed a perfect line, why didn't I think of that!
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