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Bowed Keyboard #2: Wheelharp: my first attempt at trying to simulate bowed strings with a keyboard

Blog entry by JonJ posted 700 days ago 341 reads 0 times favorited 7 comments Add to Favorites Watch
« Part 1: Wheelharp: my first attempt at trying to simulate bowed strings with a keyboard Part 2 of Bowed Keyboard series Part 3: More on the wheelharp »

After getting the frame built, it was time to do what I was afraid was going to be a nightmare…getting the plywood skin to bend around the frame without having a break in one of the inner plys. I didn’t use any fancy woods here- a $14 sheet of underlayment from the local lumberyard. I did take the time to go through the stack and find one that had no voids visible from the edge. Then it was off to a local mill to get one of the plys taken off with a large door sander. About 3 passes and it was done- I had a plywood wet noodle. When I got home it just about jumped on the frame itself, it went so easy-

Photobucket

In less than an hour, both tubes were all glued up to the frame. Isn’t it nice when you are expecting the worst, and somehow it falls into place like it was meant to be? Those moments don’t happen nearly enough, but I like ‘em!

I was starting to get excited now, I had most of the major pieces done, and it was time to get some finish on it and start putting things together to make some noise!

I didn’t get photos of the actual finishing process- it was a nerve wracking time. I used dye that I mixed under flourescent shop lights. It looked great on the wood…...under flourescent lights, that is. The morning after I sprayed all the color I took the pieces out under the sunlight and thought I would die! Have you seen the color orange on the barrels in a construction sight? These would’ve made good ones.

coming together

To make a long story short, I messed around with different colors of dye and was able to tone the orange down to a color I really wasn’t looking for to start with, but after a while , I couldn’t imagine any other color being more perfect. I got it standing on it’s own 4 feet, and the world was good again…

-- Jon


7 comments so far

View Thos. Angle's profile

Thos. Angle

4013 posts in 860 days


posted 699 days ago

Very interesting. I always learn from the blogs and this one has a lot of good info.

-- Thos. Angle

View Dadoo's profile

Dadoo

1723 posts in 888 days


posted 699 days ago

Alright Jon! Keep it coming!

-- Bob Vila would be so proud of you!

View Karson's profile

Karson

25806 posts in 1298 days


posted 697 days ago

Great Jon. So If I understand You made 5.2MM 3 ply plywood into XX 2 ply Plywood is that correct. It inside layers was going the length of your cylinder and the original top ply was going around.

-- What happens in the workshop stays in the workshop. No wait that doesn't sound right. Karson Southern Delaware karson_morrison@bigfoot.com †

View JonJ's profile

JonJ

105 posts in 738 days


posted 696 days ago

Karson, that’s correct. The resulting material is not very strong, but the string tension loads are carried by the two 2×6 oak side rails. The only pressure to get to the cylinders is the slight down bearing from the bridges, and that is equally distributed around the whole surface. I first tried the 2 ply on the rope tension drum I have listed on projects. I just run it through my planer, and it worked great! I have built a lot of curved pieces now using the stuff…sometimes relaminating it with urethane and vacuum bagging it.

-- Jon

View rikkor's profile

rikkor

11335 posts in 772 days


posted 696 days ago

You got this wannabe luthier’s attention. Keep us up on your progress.

View JonJ's profile

JonJ

105 posts in 738 days


posted 694 days ago

rikkor,

You got this wannabe luthier’s attention. Keep us up on your progress.

wannabe luthier? I saw your guitar…I think you are one, and a good one at that! I on the other hand, am lazy and don’t sand as much as I should, don’t wait for stuff to dry before assembly, and I don’t have the patience to fish either. I probably shouldn’t be doing woodwork…

-- Jon

View rikkor's profile

rikkor

11335 posts in 772 days


posted 694 days ago

I probably shouldn’t be doing woodwork…

That’s just wrong on many levels.

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