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  1. #16
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    Re: Another what wood is this?

    Lots and lots and lots of xylophones for schools are made using padouk. Cut to size, shape the back to tone ( using an app like Jim suggested makes it easy) , and then color it if needed.

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    Re: Another what wood is this?

    Quote Originally Posted by Jim Wallace View Post
    While it would be nice to have the same wood, what you really want is to have the correct tone. If it's a different wood the tone bar may have to be a little longer or shorter than what would make a straight line for the tops and bottoms of the keys, but that would really be of little concern. My son is a musician, and he has an app on his phone that he uses to tune his instruments (guitar etc.). You could make a piece of whatever wood you finally choose that matches the width, depth, and shape of the other tone bars, drill the mounting holes and put it on the instrument, but leave it long. Then you can tune lit accurately by shortening it with tiny cuts on the table saw or by using a disc sander. If the sound is correct I imagine they'll be pleased.
    One consideration with drilling the holes and then cutting is that the holes might not align with the nodes, thus damping the resonance.
    Last edited by redknife; 11-07-2017 at 07:40 PM.

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  4. #18
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    Re: Another what wood is this?

    All interesting answers. I would have guessed bamboo!!
    "The American Republic will endure until politicians realize they can bribe the people with their own money!" Alex de Tocqueville"

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  6. #19
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    Re: Another what wood is this?

    I've seen some out of bamboo.

  7. #20
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    Re: Another what wood is this?

    looks like purple heart to me after it has browned out. very hard,heavy and strait grain.
    fred p If it ain't broke you aint trying hard enough

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  9. #21
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    Re: Another what wood is this?

    Why did Phil give us the dimensions and weight to calculate the density of the wood (lbs/cu ft) as a potential clue?

    Ignoring that point entirely I'll guess that it's hard maple at 44 lbs/cu ft.

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  11. #22
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    Re: Another what wood is this?

    Phil, does the wood sink? If so, then it would have to be somewhere north of 62 lbs/ft density.

    I'm at a loss to guess a species - through FredP's thought of purpleheart seems a reasonable guess given the weight (density).
    "Remember - If the women don't find ya handsome, they should at least find ya handy!" - Red Green
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  13. #23
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    Re: Another what wood is this?

    Quote Originally Posted by CDPeters View Post
    Phil, does the wood sink? If so, then it would have to be somewhere north of 62 lbs/ft density.

    I'm at a loss to guess a species - through FredP's thought of purpleheart seems a reasonable guess given the weight (density).
    It sinks like a rock. I re did the calculation using inches and lbs and still came close to 100 lbs / cu ft which does not make sense

    Maybe my small jewelers scale is off

    But just for comparison I cut a piece of paduck to the same dims and it weighed 6.63 oz compared to the test bar at 10.35 oz

    I also scraped off some of the stain and it is clearly a grey tone wood

    I am assuming if I find a wood with similar density it will make the task of getting the tone right much easier

    FYI - The missing bar is a B note

    I have downloaded a tuning app to help me get the pitch right, but most likely I will make an assortment and take them down to Fayetteville and let the students determine the right one

    Thanks

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  15. #24
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    Re: Another what wood is this?

    I really appreciate you taking on this challenge and anything I can do to help I will. Please keep us informed of the progress as you've been doing.

    Let me know if I can do anything to help - I will look for that piece of Lignum Vitae if next trip to Cary.
    Ban shredded cheese, make America grate again.

    "May the grain be with you" - Roy Underhill

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    Re: Another what wood is this?

    Ipe? It's between 66 to 75 pounds per cubic foot?

    B
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    Re: Another what wood is this?

    Caveat, I know next to nothing about instrument building. Is it possible they are a 2 piece glueup with a metal bar sandwiched in? Just thinking about the weight/density. Not finding anything above about 70 lbs/ft3 at 12% MC.
    "Remember - If the women don't find ya handsome, they should at least find ya handy!" - Red Green
    "Always take hold of things by the smooth handle." - Thomas Jefferson

  18. #27
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    Re: Another what wood is this?

    And the rest of the story is that it is not wood.

    I made a fairly exact copy out of purple heart and it was not even close to the same weight.

    My sample key weighed 290 grams and the purple heart weighed 177

    So scraped the finish from the bottom of one of the keys and then determined it is fiberglass with a very good fake wood grain

    Plan b is to make one out of fiberglass

    and Plan c is to remake all of the keys out of wood

    My son and I made a cold-press mold and did a layup using heavy fiberglass cloth and polyester resin.






    After a few hours of cure time we will know if plan b worked
    Attached Images Attached Images

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  20. #28
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    Re: Another what wood is this?

    I have a piece of fiberglass material that may work for you. I'll throw it in the truck.
    fred p If it ain't broke you aint trying hard enough

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  22. #29
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    Re: Another what wood is this?

    This seems to be a really hard project, but with a really big eventual outcome. Hope you succeed for these people and let me know if there's anything I can do to progress the project. You rock for undertaking this.
    Ban shredded cheese, make America grate again.

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  23. #30
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    Re: Another what wood is this?

    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.

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