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Thread: Home shop solution for a reasonable master square for the surface plate?

  1. #31
    Join Date
    Jan 2014
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    Long Island, N.Y.
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    2,606

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    Quote Originally Posted by Dan_the_Chemist View Post
    Now available on eBay. For a mere $3000 you can have a 36 3/4" long X 8 7/16" diameter cylinder square, complete with a questionable bolt through it to help deform it...
    That's the ovality zeroing adjustment.

  2. #32
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    Jan 2014
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    In the desert
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    I picked up a cylinder square new a while back. I don't recall that it was all that expensive. On the other hand if I picked it up in the first place I must have been flush at the time. When I'm flush "not to expensive" is a lot higher than when I just paid all my bills and I'm waiting for quotes to come in.

    I do also have a granite square, but I've only ever used it once to prove in a video that a machine didn't cut square so the manufacturer would send me a new saddle.
    *** I always wanted a welding stinger that looked like the north end of a south bound chicken. Often my welds look like somebody pointed the wrong end of a chicken at the joint and squeezed until something came out. Might as well look the part.

  3. #33
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    Aug 2016
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    Appalachian Ohio
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    Wrist pins need to have a very uniform diameter end to end. They don't need to have very accurately square ends. This guy checked a few wrist pins and found that they are not square by up to .015" over a 5" wrist pin.

    https://www.youtube.com/watch?v=Ofhek3Lbxkc

  4. #34
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    Mar 2008
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    High, Wide and Handsome, Montana
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    Right.. you lap them in, and have a hardened square with a nice finish.

  5. #35
    Join Date
    Jun 2001
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    North Central Texas
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    2,495

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    Wrist pins that are pressed in have no real requirement to be square on the ends.
    Full floating pins that use retaining locks on the ends, will be ground square so the locks will survive the pounding.

  6. #36
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    Apr 2014
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    Ventura,CA.
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    Would Cummins diesel engine wrist pins work?

  7. #37
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    Dec 2015
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    Chilliwack, BC, Canada
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    Quote Originally Posted by jmm03 View Post
    Would Cummins diesel engine wrist pins work?
    The engines found in the trucks are not all that large. So I'd expect that the wrist pins would be much the same. Probably want something out of a 10L or larger size such as found on the big earth movers and the like.

  8. #38
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    Nov 2008
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    SF East Bay.
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    Is it really that hard for a bunch of machinists to make a cylinder on a lathe?
    At the end of the project, there is a profound difference between spare parts and extra parts.

  9. #39
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    Mar 2008
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    High, Wide and Handsome, Montana
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    Quote Originally Posted by danlb View Post
    Is it really that hard for a bunch of machinists to make a cylinder on a lathe?
    Many ways to skin a cat, different budgets, different ideas of whats acceptable. We discuss, and op can do what he wants.
    A ground smooth surface is important to me, not to you. No harm no foul.

  10. #40
    Join Date
    Mar 2005
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    Toronto
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    10,625

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    Quote Originally Posted by danlb View Post
    Is it really that hard for a bunch of machinists to make a cylinder on a lathe?
    I most only ever turn cones.
    .

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