with fork crown and turn buckle ...... the last millimetres?

Baltic Sea

Banned
Polish
Hello all users!

They are
designed for very easy installation with fork crown and turn buckle for adjustment of the pipe of the last millimetres.

The way I understand the marked fragment is as follows:

(they are) equipped with a fork crown and a turn buckle for adjustment of the pipe accurate to a millimetre (with accuracy of a millimetre).

Thank you. The source: SB Broneske - Exhaust Pipe Specialists_sm[1]. It is not available online.

 
  • sdgraham

    Senior Member
    USA English
    Your original sounds very odd to my AE ear, especially since turnbuckle is one word. Might it be written by a non-native English speaker?

    The way I read it is: "They are equipped with a fork crown and a turnbuckle for the last few millimeters of adjustment.

    I see nothing whatsoever to imply "accuracy."

    But since I regard it as poorly written in the first place, I'm speculating.

    Concise Oxford English Dictionary © 2008 Oxford University Press:
    turnbuckle/ˈtəːnbʌkl/
    nouna coupling with internal screw threads used to connect two rods, lengths of boat's rigging, etc. lengthwise or to regulate their length or tension.
    'turnbuckle' also found in these Oxford entries:
     

    Baltic Sea

    Banned
    Polish
    Thank you very much, but does it really apply to the last few millimeters of adjustment? I don't quite understand the fragment and I find it very confusing. It has been translated probably from German.
     

    pwmeek

    Senior Member
    English - American
    A turnbuckle does two things: it acts as a mechanical force multiplier (an easy turn causes a tremendous pull) and an easily-made fine adjustment (a relatively large motion of turning causes a very small linear motion).

    Fork crown is the wrong translation (for AE at least) from the original. The word you want is "clevis". A clevis is a normal termination for a turnbuckle.

    Here is a picture of a turnbuckle with clevises (fourth image down).
     
    Last edited:

    pwmeek

    Senior Member
    English - American
    As I said, the turnbuckle can be used to make very fine (precise) adjustments. If the exhaust pipe is suspended or braced by a turnbuckle, making an entire 360° rotation of the barrel of the turnbuckle will only adjust its length (and the position of the pipe) by twice the pitch of the threads (typically a millimeter or so). Thus a fraction of a rotation would make an even smaller adjustment of fractions of a millimeter.

    Gross adjustments can probably be made by fastening the end (clevis) of the turnbuckle to a different hole 10 or 20 millimeters away (which may be the only adjustment available on lesser systems), and the final, accurate adjustments can be made by rotating the barrel of the turnbuckle.
     
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