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Estonia Pianos
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Joined: Sep 2018
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Gluing up the panel.
[Linked Image]
Panel glued up and shaped.
[Linked Image]
Laying out the ribs.
[Linked Image]
Gluing ribs onto the panel.
[Linked Image]
Bridges glued on and finish applied to bottom.
[Linked Image]
All glued in.
[Linked Image]


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
www.chernobieffpiano.com
Youtube https://tinyurl.com/5aw83b73


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Very interesting and instructional.

What kind of glue is used for the various wooden components pictured?

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Thanks for the photos Chris.

Curious - do you pay any attention to the look between the pieces of spruce? Further, are they the same phylum of spruce or are you using different spruces, perhaps for the difference in brittleness? (just a guess on my part)

For instance, we will sometimes use white spruce ribs and use sitka ribs for the last three or four in the treble.

Thanks again.


Rich Galassini
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You mean I can just make one of these in my garage too? wink


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How big is the piano for which that soundboard is made?


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Originally Posted by Emery Wang
You mean I can just make one of these in my garage too? wink

That is correct.

Michio Kaku constructed a particle accelerator in his garage for a science project, so yes, piano construction is totally acceptable. smile

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The piano is a Baldwin R.
Rich, normally I watch the species and match the color, but in this case my client loves the Red Spruce and I told him i only have enough for half a board, and he said go for it. So its custom! The rib stock. i would never use Spruce as I want a deeper rich tone, so i use the best grade of Eastern White Pine. Its identical to Sugar Pine just different coast.
Here are more pics i meant to post earlier. One species change i am thinking of adding is Boxwood for the bridge caps in the treble sections, as it has a finer grain than Maple.
Gluing bridges on.
[Linked Image]
Hand Planing Panel
[Linked Image]
My new rib design for adjusting flexure.[Linked Image]

-chris

Last edited by Chernobieff Piano; 09/09/20 01:29 PM.

Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
www.chernobieffpiano.com
Youtube https://tinyurl.com/5aw83b73


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Originally Posted by Emery Wang
You mean I can just make one of these in my garage too? wink

Of course! All of the finest soundboards made for centuries were made with clamps, glue, chisels, and planes - all hand tools.

In this case it is not the tool in the hand, but the hand that holds the tool that makes a difference. thumb


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More pics.
Measuring rib flexure.
[Linked Image]
Computer engineering of rib scale.
[Linked Image]
Adjusting soundboard flexure.
[Linked Image]
-chris

Last edited by Chernobieff Piano; 09/09/20 01:34 PM.

Chernobieff Piano Restorations
"Where Tone is Key"
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www.chernobieffpiano.com
Youtube https://tinyurl.com/5aw83b73


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Thanks for this. Interesting to see steps laid out in one post.

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really cool stuff. Thanks for sharing Chris.


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Thanx for sharing Chris. This is extremely interesting; watching a piano comes to life. Please continue posting pictures.


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Just wondering about thicknessing of the board. I see a couple of hand planes in the photos. The individual planks are thicknessed with a thickness sander I presume then cleaned up by hand? You must have some very deep throated calipers to check thickness.


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Thank you for sharing this, Chris. It would look great in your professional portfolio. Along side the guest book! smile


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Originally Posted by jshelton
Just wondering about thicknessing of the board. I see a couple of hand planes in the photos. The individual planks are thicknessed with a thickness sander I presume then cleaned up by hand? You must have some very deep throated calipers to check thickness.

I did use calipers at one time, but hand planing is surprisingly accurate as far as getting a flat surface. I start with making a large wedge roughly 3/8" to 1/4". Then I adjust the thickness using dials and by ear after its in the piano.
-chris


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
www.chernobieffpiano.com
Youtube https://tinyurl.com/5aw83b73


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Very interesting! I would be curious to hear your design compared with a good Baldwin R with the original board which I think is a really nice sounding Baldwin piano.


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Do you taper the edges Chris? I imagine any hand planing inside the piano can't get all the way to the edges due to the curves in the rim, so you'd have to taper before it's installed.


Daily driver: Yamaha Avantgrand N1
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The Dissecting the Piano Tone videos with Todd Scott was my latest Baldwin R before my latest invention as shown in these photos. Only recorded on iphone but Todd is an excellent pianist and the piano could do anything he wanted. No barking or weaknesses. Trust me he tried.

Emery,
The hand planes get close enough. If you think about it, anything directly on top of the rim doesn't effect the board motion.

-chris


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
www.chernobieffpiano.com
Youtube https://tinyurl.com/5aw83b73


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wow, that's really cool, thanks for sharing


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Chris, I am surprised that no one has made comment on your rib design, which I find interesting. It appears that you have been looking over the shoulders of the guitar luthiers. Unlike piano makers, there are a multitude of rib designs. You can see scalloping combined with tapering, as the rib laying across other ribs in the rim shows, often asymmetrical too. The shape of the rib can vary also, parabolic, trapezoidal, rounded, and others

Your rib flex load test has the load bearing on the apex of the rib thickness. Can we assume that you are doing just that wherever possible? (the load point of the bridge on the rib can vary quite widely).

I would be very interested in how you made your choices in the design of each rib.

I remember seeing a mid-sized Chickering grand many years ago that tapered similarly. That shouldn't be surprising, as Chickering tried everything at least once. :-)

I have a Steinway O in my shop with a new red spruce soundboard, which is a pretty rare bird these days. But aren't you diluting the blood lines by combining red spruce and white spruce? (joking)

- Will


fine grand piano custom rebuilding, piano technician and tuner
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