Sounds of Music B

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MacBookMinus
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Re: Sounds of Music B

Postby MacBookMinus » April 26th, 2013, 3:28 pm

Keep in mind, the pitch of the marimba will depend on the environment. So you can cut the keys now if you want, but sand them down to at least 50 cents sharp at room temp. That way, you can make it perfect next year. Same with the resonators.
50 cents??? That seems quite a bit extreme.
Confucius say "man who run in front of car get tired, but man who run behind car get exhausted."

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Re: Sounds of Music B

Postby Infinity Flat » April 26th, 2013, 4:37 pm

Keep in mind, the pitch of the marimba will depend on the environment. So you can cut the keys now if you want, but sand them down to at least 50 cents sharp at room temp. That way, you can make it perfect next year. Same with the resonators.
50 cents??? That seems quite a bit extreme.
Yeah, that really doesn't make any sense
Besides, you always want to sand FLAT not sharp, as it's much easier to make a note sharper than flatter...
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

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Re: Sounds of Music B

Postby ali941 » April 26th, 2013, 5:34 pm

Keep in mind, the pitch of the marimba will depend on the environment. So you can cut the keys now if you want, but sand them down to at least 50 cents sharp at room temp. That way, you can make it perfect next year. Same with the resonators.
50 cents??? That seems quite a bit extreme.
Yeah, that really doesn't make any sense
Besides, you always want to sand FLAT not sharp, as it's much easier to make a note sharper than flatter...
Actually, it's much easier to make a note flatter than sharper for a marimba. 50 cents isn't that bad. Some of mine started at 300 cents sharp.
2013 Events:
Sounds of Music, Rocks and Minerals, Dynamic Planet, Metric Mastery: 2nd, Regionals

Hopeful 2014 events:
Dynamic Planet, Rocks and Minerals, Technical Problem Solving, Designer Genes, Astronomy*, MagLev*

IM AN ALICORN
The sky ain't sky blue. Who'da thunk it?

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Re: Sounds of Music B

Postby Infinity Flat » April 26th, 2013, 5:39 pm

Actually, it's much easier to make a note flatter than sharper for a marimba. 50 cents isn't that bad. Some of mine started at 300 cents sharp.
Sorry, you're right, I was confusing myself for some reason.
But I still don't know why you'd leave it that off. You really should be aiming for <2 cents on the fundamental, and <10 cents on each overtone.
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

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Re: Sounds of Music B

Postby ali941 » April 26th, 2013, 5:44 pm

I meant before the final sanding. You should have it about that far off when you drill the holes at the nodes, and then do final sanding to bring it within 2-3 cents of the correct pitch. Sorry about being unclear.
2013 Events:
Sounds of Music, Rocks and Minerals, Dynamic Planet, Metric Mastery: 2nd, Regionals

Hopeful 2014 events:
Dynamic Planet, Rocks and Minerals, Technical Problem Solving, Designer Genes, Astronomy*, MagLev*

IM AN ALICORN
The sky ain't sky blue. Who'da thunk it?

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Re: Sounds of Music B

Postby Infinity Flat » April 26th, 2013, 5:54 pm

I meant before the final sanding. You should have it about that far off when you drill the holes at the nodes, and then do final sanding to bring it within 2-3 cents of the correct pitch. Sorry about being unclear.
Gotcha, and that sounds about right to me. Though I personally did mine at 25 cents I think, since I had 2 overtones and wanted them all to be pretty tight.
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

ali941
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Re: Sounds of Music B

Postby ali941 » April 26th, 2013, 5:57 pm

I meant before the final sanding. You should have it about that far off when you drill the holes at the nodes, and then do final sanding to bring it within 2-3 cents of the correct pitch. Sorry about being unclear.
Gotcha, and that sounds about right to me. Though I personally did mine at 25 cents I think, since I had 2 overtones and wanted them all to be pretty tight.
I procrastinated like crazy, so I didn't get that luxury. :(
2013 Events:
Sounds of Music, Rocks and Minerals, Dynamic Planet, Metric Mastery: 2nd, Regionals

Hopeful 2014 events:
Dynamic Planet, Rocks and Minerals, Technical Problem Solving, Designer Genes, Astronomy*, MagLev*

IM AN ALICORN
The sky ain't sky blue. Who'da thunk it?

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Re: Sounds of Music B

Postby miggy_magtaan » April 26th, 2013, 9:32 pm

I meant before the final sanding. You should have it about that far off when you drill the holes at the nodes, and then do final sanding to bring it within 2-3 cents of the correct pitch. Sorry about being unclear.
Gotcha, and that sounds about right to me. Though I personally did mine at 25 cents I think, since I had 2 overtones and wanted them all to be pretty tight.
I procrastinated like crazy, so I didn't get that luxury. :(
don't worry, one week before the competition and we haven't even built the instruments yet. :?
DIVISION B

2013 Regional/State Events:
3rd Place Overall Team

Sounds of Music; Unknown
Anatomy; 4th Place (State)
Keep The Heat; Unknown

=~=

2014 Regional Events
1st Place Overall Team

Anatomy; 1st Place
Can't Judge a Powder; 1st Place
Experimental Design; 3rd Place

ali941
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Re: Sounds of Music B

Postby ali941 » April 26th, 2013, 9:40 pm

That's problematic. Good luck!
2013 Events:
Sounds of Music, Rocks and Minerals, Dynamic Planet, Metric Mastery: 2nd, Regionals

Hopeful 2014 events:
Dynamic Planet, Rocks and Minerals, Technical Problem Solving, Designer Genes, Astronomy*, MagLev*

IM AN ALICORN
The sky ain't sky blue. Who'da thunk it?

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Re: Sounds of Music B

Postby MacBookMinus » April 29th, 2013, 7:16 am

Yeah, that really doesn't make any sense
Besides, you always want to sand FLAT not sharp, as it's much easier to make a note sharper than flatter...
Well, I think it would depend on the instrument no?

If you have a marimba bar, it's easier to shave mass from the middle, lowering the pitch and not changing the placement of the nodes. If you shave from the end, then the nodes change location.
Confucius say "man who run in front of car get tired, but man who run behind car get exhausted."


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