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Thread: Piston crown thickness measuring thingie.

  1. #1
    [email protected] tonyfoale's Avatar
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    Piston crown thickness measuring thingie.

    Just a quickie tonight.
    Normal calipers and micrometers are a bit useless when it comes to measuring piston crown thickness because the skirt and gudgeon pin bosses get in the way. To circumvent these problems I made a simple device to use with a dial gauge which does the job well and has also found other uses with various difficult to measure do-dads.

    Piston crown thickness measuring thingie.-pistoncrownmeasurer_01.jpg Piston crown thickness measuring thingie.-pistoncrownmeasurer_02.jpg

    The upright which looks like a multi-stage space rocket is shaped as it is for a deeply technical reason. It's the way that it came out of the scrap box.
    To use it is just a question of setting zero on the dial gauge, lifting the plunger and inserting the piston over the pillar and gently lowering the plunger. The piston can be moved around to get the thickness at different areas of the crown. Simple but very effective.

  2. The Following 5 Users Say Thank You to tonyfoale For This Useful Post:

    Frank S (12-17-2016), mklotz (12-17-2016), olderdan (12-18-2016), Paul Jones (12-21-2016), PJs (12-18-2016)

  3. #2
    Frank S's Avatar
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    We had a thread a while back where one the solutions amounted to very nearly the same as your tool
    Measuring thickness of metal diaphragms
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  4. The Following 2 Users Say Thank You to Frank S For This Useful Post:

    Paul Jones (12-21-2016), tonyfoale (12-18-2016)

  5. #3
    Content Editor DIYer's Avatar
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    Thanks tonyfoale! We've added your Piston Crown Measuring Fixture to our Measuring and Marking category,
    as well as to your builder page: tonyfoale's Homemade Tools. Your receipt:




  6. The Following User Says Thank You to DIYer For This Useful Post:

    tonyfoale (12-21-2016)

  7. #4
    [email protected] tonyfoale's Avatar
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    When I first posted this tool I couldn't find the pix. showing it in use. They surfaced tonight and so here are a couple. I think that the ease of use is pretty obvious.

    Piston crown thickness measuring thingie.-crownthickness.jpg


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