Saturday, January 26, 2008

How to Build a Hank Drum

Over the holidays, I had some down time to finally build a new "Hank Drum" based on the plans by Dennis Havlena. Here's a link to the plans: http://www.ehhs.cmich.edu/~dhavlena/for-webpage-lp-hang.htm


I've been in love with the Hang Drum, but alas, I haven't been able to find an affordable one to purchase yet (but you can read more about that adventure on my other posts).


Here's the story about my creation process in building my own Hank Drum.


Step 1: Purchase a brand new 20 lb propane tank. NOTE: like Dennis recommends, ONLY USE A NEW NEVER BEEN FILLED TANK.





Step 2: Remove the value. I released the air pressure inside the tank with a screw driver by turning the screw on the side of the valve. Then I used a large adjustable wrench and some leverage to move it. This will take some strength and possibly addition help to hold the drum and turn the wrench. In the picture, you'll see how I secure the drum with a crowbar.



Step 3: Remove the bracket from the bottom of the tank. This will become the playing surface of the drum. I used a 10" adjustable (monkey) wrench, tightened to the dimension of the metal on the bracket. I then worked it back and forth over each weld until the bracket broke free. After breaking off the welds, be sure to file down the weld mounts until they are flush with the surface of the 'drum head'.



Step 4: Printout the pattern from Dennis's website and enlarge the pattern on your scanner or a copy machine until it is the correct dimension. Position this pattern overtop of the "drum head".



Step 5: Trace the pattern onto the surface of the drum. I used a sharpie pen to copy it. This turned out to be a pretty good idea, as the saw scratched up the surface pretty good and I was using oil to help the cut. If I had used a pencil or a water soluable pen, the lines would have been messed up.



Step 6: Cut the tongues out with a jigsaw and metal cutting blade. Follow Dennis' advice on grinding down the blade to cut the tight radius. I went through two blades to cut all of the tongues out. Here's where I made one variation from Dennis's recommendation. Instead of drilling three small holes (my cordless drill battery is pretty shot anyway), I used a dremel tool with a cut-off wheel to start the cut, right on the line of the tongue. (I apologize that the image is sorta blurry). From here it was easy to cut out the rest of the tongue. NOTE: As Dennis recommends, make sure that you stop short on each tongue. This leaves you room to tune each tongue later.



Step 7: Tuning the drum. This is the step where you have to be the most careful. You'll need a digital tuner to complete this step. I started with the biggest tongues first. I used a hacksaw blade with half of it covered in electrical tape, to extend the cuts of each tongue until it was in tune. Note: as shown in the picture, I used eletrical tape to deaden the other tongue while I tuned a specific tongue. I also followed Dennis's advice and left the larger tonque's "open" when tuning the highest two tongue. I am still not completely happy with the tuning or performance of the highest two notes, they "sound" but they don't ring very long.


Step 8: Add a couple of rubber tie down's to the middle of the drum. This helps to dampen the ringing.


Step 9: Play your drum!

Additional thoughts:

First of all, props to Dennis Havlena for his incredible ideas! Keep 'em coming...

Second, I took a dowel, inserted it though the value hole, placed the end on the backside of a tongue and then hit it several times with a hammer. This pushed the individual tongue "up" above the surface of the tank bottom. I think that this make it more playable.

Third, I've also been playing around with the strategic placement of modeling clay on the tank bottom to help eliminate some of the overtones, attempting to get a purer sound.

Fourth: Check the "How To" link section on the sidebar of the blog for additional blog entries on Hank Drum construction.

I'll post a YouTube video once I get a moment to record something.

Join the Hank Drum Collective: http://hankdrum.collectivex.com

13 comments:

divkur said...

thanks for the photos and extra tips. you could try http://www1.ocn.ne.jp/~tuner/soft/TUNER_E.zip for tuning (software tuner - i use it for flutemaking)

miasm said...

for anyone looking for a much easier way to take off the valve. I used a heat gun to melt the glue that makes the valve hard to get off. It was incredibly easy to unscrew it after it was properly melted.

MikeO said...

miasm, great idea. I just picked up a propane torch at an estate sale this weekend, I'll have to give it a try on my next "de-valving". I wonder if the steel expands at a different rate than the brass valve. This might also help to make the valve removal simplier while it's still warm.

Anonymous said...

I'm trying to find a new tank to buy, could you suggest any searches to google with or direct links, cheers

cfoulkey said...

knock the tongues with the dowel before or after tuning? thanks!

Anonymous said...

if you want to read this webpage in spanish enter in this page>

http://translate.google.com/translate?u=http%3A%2F%2Ffoundmusic.blogspot.com%2F2008%2F01%2Fhow-to-build-hank-drum.html&hl=es&ie=UTF-8&sl=en&tl=es

Slim49 said...

Hi all,
I have made 2 of these, both DH's & Modified's version. SWEET!
I wonder...could the sound Deading self-sticking mat.called Dynamat.
or spraying bed liner in there?
5 blades in all. heavy grease on the blade sides does help.
Used a 4.5" cutoff disk on my grinder, all the straight parts.
Such a COOL thing..

Anonymous said...

hi there from across the pond.
curious is the question< what is the thickness of the steel you cut on your hank? in europe the standard tends to be mild steel 5mm thick. i have a rockcreek and the steel is 3mm. would this not then alter note dimensions? miasm you are a star great time saver. also a metabo pro jigsaw helped me cut xtremely well no need for oil, only lost one blade. could be i was cautious enough to be lucky, one love all. G man

Anonymous said...

Why not cut the tongues square instead of rounded? Wouldn't that be easier?

tankdrum said...
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tankdrum said...
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Anonymous said...

yeah right ... thanks Mr Tankdrum :/

Anonymous said...
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