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Hot Rods Curious tool

Discussion in 'The Hokey Ass Message Board' started by Dave Gray, Apr 4, 2024.

  1. Dave Gray
    Joined: Sep 4, 2010
    Posts: 297

    Dave Gray
    Member

    A friend just showed me a tool today that he has owned for many years. I had never seen one of these before. Anyone familiar with this tool? IMG_5055.jpeg IMG_5056.jpeg
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 59,182

    squirrel
    Member

    Does it include the instructions? this is from the interwebs from a past auction of one

    hammer11.jpg hammer3.jpg hammer2.jpg
     
  3. Oneball
    Joined: Jul 30, 2023
    Posts: 1,486

    Oneball
    Member

    Yep it’s peening hammer. Used for peening (stress relief).
     
  4. TCTND
    Joined: Dec 27, 2019
    Posts: 709

    TCTND
    Member

    Is that intended to expand collapsed piston skirts? Reduce slap and noise?
     
  5. Oneball
    Joined: Jul 30, 2023
    Posts: 1,486

    Oneball
    Member

    No, it changes the surface structure of the material not its shape. In very very simplistic terms it makes it stronger
     
    tractorguy and chryslerfan55 like this.
  6. TCTND
    Joined: Dec 27, 2019
    Posts: 709

    TCTND
    Member

    Actually, that's a little too simplistic. Peening as it is commonly used puts the surface in a state of compression which causes it to resist cracking. This makes the part more resistant to breaking but not really stronger. Peening a relatively thin section can also expand it which is why I speculated as to this tools purpose. We won't really know until someone comes up with the complete instruction sheet.
     
  7. Dave Gray
    Joined: Sep 4, 2010
    Posts: 297

    Dave Gray
    Member

    winduptoy likes this.
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 59,182

    squirrel
    Member

    so of course you have to scan/photograph all of them and post here, for posterity...
     
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  9. BJR
    Joined: Mar 11, 2005
    Posts: 11,009

    BJR
    Member

    So am I understanding this correctly, the hammer head moves like a hammer should while the handle doesn't move? All powered by air.
     
  10. Good scans of the instruction sheets would be very helpful. ;)

    If the tool is still in working order, then a video (even a short one) of the tool in use on an old, scrap piston would be the "icing on the cake"!
    :D
     
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  11. Dave Gray
    Joined: Sep 4, 2010
    Posts: 297

    Dave Gray
    Member

    Photos of the instructions. IMG_5090.jpeg IMG_5086.jpeg IMG_5087.jpeg IMG_5088.jpeg
     

    Attached Files:

    Beanscoot, ClayMart, squirrel and 2 others like this.
  12. 19Fordy
    Joined: May 17, 2003
    Posts: 8,313

    19Fordy
    Member

    Never saw that tool before. Thanks for posting all the info.
     
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  13. moonman29
    Joined: Apr 2, 2010
    Posts: 179

    moonman29
    Member

    Very interesting. Thank you for posting.
     
  14. This is correct. Peening results in the surface to have compressive stresses, which improves fatigue cracking resistance. It does not have enough depth to affect strength of the material, being only a few thousandths typically. Shot peening is a similar end result as this manual hammer peening. Valve springs are one example part that has shot peening done, as they obviously go through numerous cycles - which is what fatigue is. Thousands and thousands of stress cycles that are in the eleastic range (below the yield strength). Fatigue cracking is NOT because the metal got weaker, like when you think of your muscles fatigued from work. Totally different, but uses the same base word. Fatigue in metals is where there is repeated cyclic tensile stress, and a crack can initiate and propagate. Eventually this crack becomes too big and the part experiences catastrophic failure and breaks due to overload; since the remaining uncracked portion can not support the operating load.
     
    ClayMart likes this.

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