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Thread: Squarness Comparator

  1. #1
    rossbotics rossbotics's Avatar
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    Dec 2013
    Thanked 813 Times in 234 Posts

    rossbotics's Tools

    Squarness Comparator

    I built this dedicated Squarness Comparator (squarness checker) to take the place of a surface gage that I normally would convert over to a squarness comparator for checking something after grinding, having a tool that is made for a certain application speeds up the machining process, no more fumbling around with a surface gage a hand full of yokes and a dial indicator, this tool is dedicated for this purpose and will never be altered.

    This tool will check the squarness of something from 1 ½” to 6” in height, the same height as my cylinder square, for those of you that don’t know what a cylinder square is, it is one of the masters of squares.

    The Comparator has a 7/8” thick cast iron base, a 7/8” round TG&P 303 Stainless steel column, an aluminum yoke with a brass thumb screw and a used but not abused .0005” graduated Federal dial indicator with .125”travel.

    The base has been fine ground on the bottom (will be lapped later on) with a milled out pocket to reduce friction on the surface plate, there is also a machined radius (not hand ground) on the nose of the base for rotating to find the high point with the dial indicator, the column has a 3/8” hexagonal hole broached in the upper end for tightening, I have included multiple photos of the machining and grinding processes it took to manufacture this tool.

    As always thanks for looking and happy machining.


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    Comments are always welcome


  2. The Following 10 Users Say Thank You to rossbotics For This Useful Post:

    drivermark (03-29-2018), jjr2001 (03-29-2018), Jon (03-28-2018), LMMasterMariner (03-28-2018), mklotz (03-28-2018), Paul Jones (03-28-2018), PJs (03-28-2018), Seedtick (03-28-2018), SteveJustSteve (04-18-2018), Tuomas (03-29-2018)

  3. #2
    Paul Jones's Avatar
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    May 2014
    Yorba Linda, California
    Thanked 1,198 Times in 593 Posts

    Paul Jones's Tools

    Great work as always for this useful tool. I also learned something new with the term "TG&P" meaning "Turned, Ground and Polished" and found lots of metal suppliers for TG&P steels.

    Thank you,

  4. The Following 2 Users Say Thank You to Paul Jones For This Useful Post:

    PJs (03-28-2018), rossbotics (03-29-2018)

  5. #3
    Content Editor DIYer's Avatar
    Join Date
    Aug 2013
    Thanked 621 Times in 562 Posts

    Thanks rossbotics! We've added your Squareness Comparator to our Measuring and Marking category,
    as well as to your builder page: rossbotics's Homemade Tools. Your receipt:

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