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Trumpet Discussion Discuss How to measure bore size in the General forums; I always thought that bore size was the internal diameter of the lead pipe. Now a very reliable source says ...
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    How to measure bore size

    I always thought that bore size was the internal diameter of the lead pipe. Now a very reliable source says that it is the internal diameter of the second valve slide. Which is true?
    Bruce in the Peg

    1987 Yamaha 2320
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    Forte User nordlandstrompet's Avatar
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    Re: How to measure bore size

    Your very reliable source is very reliable
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    Re: How to measure bore size

    The leadpipe changes diameter along its length. The bore size is measured at the second valve slide.

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    Re: How to measure bore size

    Quote Originally Posted by geobe View Post
    The leadpipe changes diameter along its length. The bore size is measured at the second valve slide.

    To be just a wee bit more precise, the bore size is measured at the I.D.,( inner diameter ), of the second valve crook, not at the extensions of the second valve slide, which are those pieces of tubing soldered to the second valve casing.



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    Re: How to measure bore size

    Oldlou, you anticipated my next question but confused me by referring to the crook.
    Is that the piece that we can remove or the part that is soldered to the second valve casing?
    Bruce in the Peg

    1987 Yamaha 2320
    1962 Olds special trumpet # 341xxx
    1965 Olds Ambassador cornet #518xxx

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    Re: How to measure bore size

    Quote Originally Posted by Blind Bruce View Post
    Oldlou, you anticipated my next question but confused me by referring to the crook.
    Is that the piece that we can remove or the part that is soldered to the second valve casing?

    The 'crook' is that removable 'C' shaped thingy.


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    Pianissimo User Puukka's Avatar
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    Re: How to measure bore size

    Some weeks ago I wondered the same.
    I have a 460" bore Burbank 5X and a 464" bore Burbank 3X+.
    Recently I tried to interchange all four valve slides, expecting, that they won´t be interchangeable.
    Interestingly they were without any problem, so I wonder, where I can measure the difference?
    Herbert

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    Re: How to measure bore size

    Quote Originally Posted by Puukka View Post
    Some weeks ago I wondered the same.
    I have a 460" bore Burbank 5X and a 464" bore Burbank 3X+.
    Recently I tried to interchange all four valve slides, expecting, that they won´t be interchangeable.
    Interestingly they were without any problem, so I wonder, where I can measure the difference?
    Herbert
    The difference in the slides is in the length, not bore size. Those stay consistant because the trumpet tapers at only two parts of the horn; the leadpipe and the bell. The rest is cylindrical.
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    Re: How to measure bore size

    OK, I got the crook, and I tried to measure the ID with my vernier calipers. Not too consistant readings!!
    What is generally used to measure accurately?
    Bruce in the Peg

    1987 Yamaha 2320
    1962 Olds special trumpet # 341xxx
    1965 Olds Ambassador cornet #518xxx

  10. #10
    Fortissimo User Brekelefuw's Avatar
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    Re: How to measure bore size

    I have used two kinds of calipers. Normal digital calipers, as well as special calipers meant for measuring the ID of tubes. The special ones look like a gun with a rod on the end that expands when you pull the trigger. Very expensive, and very cool.
    After silence, that which comes nearest to expressing the inexpressible is music. ~Aldous Huxley
    If at first you don't succeed, keep on suckin' until you do suck-a-seed. ~ Clark Terry

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