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  1. #31
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    Re: Another what wood is this?

    Quote Originally Posted by Jeff View Post
    You're on the right track Phil. The rough weight of a generic fiberglass/polyester composite is 0.060 lbs/cubic inch. So your new composite blank should weigh about 284 g, pretty close to your mystery original at 290 g.
    Jeff, You are spot on. The composite blank weighed in 288 grams - BUT it sounded dead. I suspect the deadness is probably caused by the orientation of the glass fibers. We might try another with all of the fibers running length wise just to learn

    Interesting project

  2. #32
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    Re: Another what wood is this?

    BUT it sounded dead. I suspect the deadness is probably caused by the orientation of the glass fibers. We might try another with all of the fibers running length wise just to learn
    We're all learning and learning more. You may want to simply build the new keys from wood and ditch the fiberglass although "fiberglass" has been used for making xylophone bars but it's not just any old fiberglass.

    I got curious again but couldn't find much information about fiberglass xylophone bars and their composition but how about carbon fiber guitars with excellent acoustic qualities...maybe an aha Bingo moment!

    Density g/cm3 Acoustic coefficient
    Glass fiber polyester laminate 2.0 77.6
    Carbon fiber laminate 1.5 238.6
    Poplar 0.4 378.5
    Walnut 0.6 235.1
    Beech 0.7 247.6

    https://arxiv.org/pdf/1511.04543.pdf

    The conclusions from the article are...

    [COLOR=rgb(13.725000%, 12.157000%, 12.549000%)]The glass fiber-reinforced compo-sites show an acoustic performance similar to what wal-nut wood does. The results also reveal that the carbonfiber-reinforced composite could be used as an improvedtailored high performance alternative to be substitutedwith wood in making musical instruments showing excep-tional acoustical properties [/COLOR]


    Maybe get some carbon fiber tape about 2" w and build another bar to test. I'll bet it won't sound dead like the glass fiber did.

  3. #33
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    Re: Another what wood is this?

    hmmm.... I wonder where he might find some carbon fiber.
    fred p If it ain't broke you aint trying hard enough

  4. #34
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    Re: Another what wood is this?

    I'd buy the carbon fiber "tow" so the xylophone bar will be like ultra straight grain wood. It's also pretty cheap compared to the tape or cloth.

    http://www.fibreglast.com/product/24...ow-and-sleeves

    http://www.uscomposites.com/carbonpage.html

    http://www.uscomposites.com/carbonpage.html

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  6. #35
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    Re: Another what wood is this?

    Quote Originally Posted by Jeff View Post
    I'd buy the carbon fiber "tow" so the xylophone bar will be like ultra straight grain wood. It's also pretty cheap compared to the tape or cloth.

    http://www.fibreglast.com/product/24...ow-and-sleeves

    http://www.uscomposites.com/carbonpage.html

    http://www.uscomposites.com/carbonpage.html
    Thanks for all the links. We might try a carbon fiber bar. We have a enormous amount of aerospace quality carbon fiber in multiple weights and weaves and gallons of resin. We even have the oven with vacuum bagging to do forged carbon fiber parts - it is a matter of time to do it.

    My plan b or is it c is to remake all the keys out of wood and that should give them a richer tone - I am learning a lot about xylophones.
    The Xylophone I am fixing is an octave and a half unit which means I will be making 12 new keys, but to get it right I am going to get the entire instrument in my shop and then bring it back to the school when I have it complete/improved.

    I will keep you updated as this project progresses.

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  8. #36
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    Re: Another what wood is this?

    An octave and half should be 18 keys.

  9. #37
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  10. #38
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    Re: Another what wood is this?

    That xylophone will only play in one key. Most likely a xylophone for a school band would need to play in many keys; think of a piano - Key of C is all white keys (CDEFGABC) but there are also 5 black keys (C#D#F#G#A#) that are accidentals in C but are one of the 8 notes of other scales.

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