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shop trick - recovering from holes punched undersize

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  • shop trick - recovering from holes punched undersize

    I do a lot of fabricating, not so much machining anymore. Today I was punching a line of 3/8" holes down a 1/8x2" strip which I'd carefully layed out and centerpunched. I centerpunch the hole locations so I can find the tit on the end of the punch and that way the holes go where I want them. Otherwise it's a crapshoot because I can't really figure out what's going on. I was nearly done when I realized to my horror that I'd punched all the holes 1/4"! This of course meant that I couldn't use the centerpunch trick, so I first thought the workpiece was ruined.

    Then I thought of something. I carefully collected the slugs I'd punched out, took them and the workpiece over to the anvil, and using a hammer, drove them into the holes. They were of course centerpunched already, so then all I had to do was put the correct punch and die in the machine (in this case a Whitney No. 10 hand punch) and repunch the holes. They probably aren't perfectly located, but you can't tell by eye. I'm happy 'cuz I didn't have any more stock and steel is expensive now ..


  • #2
    Why not make a new punch with a cone to auto center the punch?


    • #3
      Because magpie would be done with the project in less time than it would take for you to turn a punch blank.


      • #4
        way to think on your may just have invented a new kind of tool .... sacrificial undersized hole dimple locating transfer punch blanks
        in Toronto Ontario - where are you?


        • #5
          That's basically how I punch the hole bigger in skillsaw blade for use on a weed eater,

          Punch out a 5/8 slug and tap it into the sawblade,then use the punch center mark to center the 7/8 punch.Works every time.
          I just need one more tool,just one!


          • #6
            Nice Save Magpie