Can’t believe my luck...what happened?

Discussion in 'The BS Topic' started by badazz81z28, Sep 14, 2019.

  1. xten

    xten Veteran Member

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    Is that a bottoming tap you are using? Looks like the wrong tap for a blind hole. You need the concentric "bottoming tap",not the tapered one. You can't start cutting threads with the bottoming tap, but with a blind hole you need to finish with it if the threads go anywhere near the bottom. Also maybe a shaving still attached to the threads that's hiding in there.
    https://www.mcmaster.com/bottoming-taps
     
  2. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Looks to me like it wasn't tapped all the way to the bottom of the hole.
    Coffee break or shift change and someone didn't bottom tap the last blind hole on that part? :screwup:

    You should have plenty of thread contact with that bolt but you won't get it seated unless you have a bottoming tap to finish cutting threads to the bottom of the blind hole.

    I would shorten that one bolt and use it.
    Run a die down the bolt, grind it off and run the die back off the bolt so you have straight threads on the end.
     
  3. badazz81z28

    badazz81z28 Veteran Member

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    What I ended up doing was running a tap down the hole. Having not looked, I’m not sure how deep the threads originally were. It cleaned it up decent, just ugly. I did assemble it yesterday...torqued to 65ftlbs, some scary moments where I thought it was going to let go. By my measurements. I have about half the threads engaged questionable threads and another half in perfect threads with a new bolt. (About .425”)
     
    Last edited: Sep 16, 2019
  4. dcozzi

    dcozzi Veteran Member

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    This^^
     
  5. badazz81z28

    badazz81z28 Veteran Member

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    Replacing the bolt wasn’t an issue. It’s was the threads in the housing that’s scary
     
  6. 80sz

    80sz Veteran Member

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    Glad you got her . Looks like wasn’t tapped to depth and you were making new threads with your bolt.
     
  7. badazz81z28

    badazz81z28 Veteran Member

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    I have OCD...But this is what the threads looked like after I ran the tap. Mind you, the bolt coming out transferred puic1.jpg metal all the way out. Not pretty...
     
  8. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

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    I thought, you got the DSE kit, wasn't all of the parts tapped and ready to go? Also what width rear did you go with? Really like the looks of that setup, just not crazy about the price.
     
  9. badazz81z28

    badazz81z28 Veteran Member

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    That is the DSE kit. Overall flange to flange is 56.250”
     
  10. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

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    I thought that the rear on a 71 Camaro or any was 55.25 flange to flange? Right?
     

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