Mandrel Material

Discussion in 'Trumpet Repair and Modification' started by Cornyandy, Sep 5, 2012.

  1. Cornyandy

    Cornyandy Fortissimo User

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    Hi gang,


    Jus wondeing can a bell mandrel be made from hard wood or does it have to be metallic? I only ask coz I know few wood turners who have offered to make a mandrel for me if I get the wood. I only want one for bell straightening duties not for making horns and well, just wondered

    Cheers

    A
     
  2. stumac

    stumac Fortissimo User

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    Hi Andy,

    an extremely hard close grained wood may suffice, I make my own from mild steel bar of various diameters. I am not a woodworker so cannot give advice on woods.

    Regards, Stuart.
     
  3. Vulgano Brother

    Vulgano Brother Moderator Staff Member

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    Wood should work just fine for smoothing out dents and all. For more serious pounding a hard plastic might work better. Some of our engineers might know of the ideal material that is cheap, durable and easy to work.
     
  4. mike ansberry

    mike ansberry Forte User

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    When you burnish the brass it will take on any imperfections in the mandrel. A wood mandrel is good for holding a horn in place so you can work on the valves, solder work, etc, but if you are going to do metal work, you need a GOOD set of steel mandrels.
     
  5. GijsVis

    GijsVis Piano User

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    You might try, but I'm not sure about the result.. I'ld play it safe and go for a steel one. Though a wooden mandrell might be convenient for holding it etc.
     
  6. jiarby

    jiarby Fortissimo User

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    Table leg in a vice will hold it... and maybe work out ez dents. Bell mandrels are cheap. Just buy the right tool..
     
  7. Cornyandy

    Cornyandy Fortissimo User

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    Thanks guys, at least I can say to them "well a wooden one would be useful" just not in the way they are thinking
     
  8. jiarby

    jiarby Fortissimo User

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    make sure they leave you something on the end of the bell flare so you can chuck it up into a vice.
     
  9. Brekelefuw

    Brekelefuw Fortissimo User

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    Tool Steel.
     
  10. stumac

    stumac Fortissimo User

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    I would be interested to know what grade of tool steel you use and what heat treatment employed.

    My homemade mild steel mandrels do all I want as an amateur doing repairs and restorations as a hobby. If I was a professional using mandrels all day every day I would certainly look at a harder material. They will see me out.

    The only professional tools I have bought are a set of dent balls and driver, cost less than $500, making them myself looked too time consuming.

    Regards, Stuart.
     

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