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  1. #1
    Join Date
    Dec 2010
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    1

    Exclamation How not to use a "Crescent" wrench

    On several occasions, I've seen Richard use a crescent wrench backwards. You're supposed to turn it this way:
    http://www.hnsa.org/doc/elect/img/pg3.jpg
    so that the adjustable jaw isn't subject to the torque. I've seen Richard apply force the other way, which tends to open the adjustable jaw by leverage, and can risk rounding the bolthead/nut.

    Thanks,
    Rich Grise

  2. #2
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: How not to use a "Crescent" wrench

    There is little to no more force placed on the jaw whether you twist it in one direction or the other. Anytime you twist a wedge in a hole, it's going to want to open the hole as the "points" of the wedge are forced against the sides. The best option is to use a fixed jaw wrench, box wrench, or socket.

    Or ... Visegrips.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Mar 2008
    Location
    nova scotia, canada
    Posts
    1,522

    Default Re: How not to use a "Crescent" wrench

    whats not noted is that richard is a plumber, he deals with pipes. the seals that are on fixtures do no need very much torque to get the proper amount of tightness. my plumber sees it all the time. diy 'ers replace their bathroom or kitchen faucet and crank on the bolt underneath the sink which can damage the fittings. all thats needed is 1/4 turn past finger tight to get the proper tightness.

    so this being said its not to big a deal for a pro to not hold the adjustable correclty . because a) not alot of torque required, b) he uses the tool all the time and has a very good feel for it
    fire up the saw and make some dust

  4. #4
    Join Date
    Dec 2007
    Location
    Tennessee
    Posts
    1,381

    Default Re: How not to use a "Crescent" wrench

    Actually, who says your link is right? If you look at the picture, you can see that "their" way puts a lot of force on the outer end of the movable jaw where it has a lot of mechanical advantage on that jaw to open it wider.

    If you use it Richards way, the force is on the inner end of the movable jaw where it has less mechanical advantage on the movable jaw.

    A crescent wrench is not a spanner wrench.

  5. #5
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: How not to use a "Crescent" wrench

    Also notice that the jaws of a crescent wrench are at an angle to the handle. If you can't get a bite on the nut with the handle in one direction, you flip the wrench over and go at it from the other direction.

    Regular open end wrenches work the same way for the same reason. It doesn't work with water pump pliers (slip joint pliers, channel locks ) because the teeth in the jaws are uni-directional.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  6. #6
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: How not to use a "Crescent" wrench

    Yikes --- if your worrying about rounding the head of a bolt or nut with an adjustable wrench then you're using the wrong tool.

    Now what's the proper way to use this tool


    Should it be held in the left hand and driven by the right hand --- or visa versa ?
    "" an ounce of perception -- a pound of obscure "
    - Rush

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