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Trumpet Discussion Discuss Meaning of "Hand-lapped valves/slides" in the General forums; Hi all, I see the term "hand-lapped valves/slides" many times in posts but I never really knew what that meant. ...
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  2. #2
    Fortissimo User veery715's Avatar
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    Mar 2007
    Ithaca NY

    Re: Meaning of "Hand-lapped valves/slides"

    It means that the final fitting of those are done by a craftsman and not by machine, if at all. A fine abrasive compound or slurry is applied between surfaces and the parts are worked up and down / in and out to smooth the surfaces where they meet.


  3. #3
    Fortissimo User Brekelefuw's Avatar
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    Mar 2006

    Re: Meaning of "Hand-lapped valves/slides"

    It's basically liquid sand paper. Final lapping is usually done with a very high grit, somewhere from 800 grit and up. I think the stuff I use at work is 1200.
    After silence, that which comes nearest to expressing the inexpressible is music. ~Aldous Huxley
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    Moderator Utimate User rowuk's Avatar
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    Jun 2006

    Re: Meaning of "Hand-lapped valves/slides"

    With a reputable company, it means that the valves can have a very consistent feel, but not necessarily have the tightest specs.

    If we are talking about the far east, it means that manual labor is cheaper than a maschine.

    If you don't know anything about what is going on behind the scenes at a company, it is just a useless tidbit of information.
    Whenever I feel blue, I start breathing again.

  5. #5
    Forte User larry tscharner's Avatar
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    Apr 2010
    dubuque iowa

    Re: Meaning of "Hand-lapped valves/slides"

    If you ever get the chance to tour or see a vidio clip of a company that does this it is simple yet very interesting. The craftsmen at Getzen were VERY talkative when I toured their shop about a year ago. Do you have a manufacturer within driving distance from where you live? Its well worth the effort to see a trumpet go from brass stock to work of art. Best wishes.
    Larry tscharner!
    M J Klashen The Yankee 1923
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