Page 3 of 3 FirstFirst 123
Results 21 to 26 of 26

Thread: Cylindrical Square Project

  1. #21
    Join Date
    Nov 2015
    Location
    Sydney
    Posts
    931

    Default

    Did you try Gudgeon pin?

  2. #22
    Join Date
    Sep 2008
    Location
    WI/IL border
    Posts
    1,860

    Default

    Quote Originally Posted by Jaakko Fagerlund View Post
    If your TPG wheel is trued from the side also, touch the end of the square (the ring part) with it to true the end.
    Good idea.

  3. #23
    Join Date
    Jul 2001
    Location
    Green Bay, WI
    Posts
    3,082

    Default

    Here a picture of my cylindrical standard
    It is 4.325 tall and 2.500 in diameter ( 63.5mm x 109.855 mm )
    There is a very faint etching on one edge that says
    Cummins
    The Part number is 3680582 as I read it - The first , second and forth digits are smudged so those numbers may be 1,0, and 8 respectively
    That means the first 4 digits could be 3680, or 1680, or 3688, 1688 , 3080,1080, 3088, 3688 , but the last three are firm as 582.
    Rich
    Super premium precision , for a very low cost.

    Last edited by Rich Carlstedt; 02-17-2017 at 02:40 PM.

  4. #24
    Join Date
    May 2005
    Location
    Milwaukee
    Posts
    923

    Default

    Quote Originally Posted by Rich Carlstedt View Post
    Super premium precision , for a very low cost.
    Come on, give it up. How much and from where? A quick google of that PN and cummins comes up with a couple vendors overseas and no prices.

  5. #25
    Join Date
    Nov 2015
    Location
    Sydney
    Posts
    931

    Default

    $13.30 from China. They even put "Made in USA" on it

    http://wancum.en.made-in-china.com/p...als-N-K-M.html

  6. #26
    Join Date
    Apr 2016
    Location
    USA
    Posts
    435

    Default

    Quote Originally Posted by JoeLee View Post
    The wrist pins may be perfectly round and have exact dia's. to the tenth on each end but are the ends square ? I'm guessing not square enough to become a precision cylindrical square without some work. The ends of a wrist pin are really an insignificant surface since all they contact is the spring or circlip.

    So I you happen to find one now your tasked with squaring up at least on end.

    JL...............
    Doesn't matter as long as it's not a mile off. Some nicer cylinder squares that are meant to MEASURE (not just act as a reference) are tilted purposefully so you can rotate them till it rests evenly on the side of your part then it tells you the error.

    Whenever you use a cylinder square you should always interpolate your indicator zero between the two extremes of sideways lean. If the square had .0002" of tilt from the base to indicator tip (well, measuring bumper to tip) then I'll set up my indicator to read -one tenth up to +one tenth as I spin the cylinder while in contact with the squareness comparator. Then I know my indicator is set to dead zero as long as the cylinder is parallel.


    Sent from my XT1053 using Tapatalk

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •