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  • Modifying a Drilled Hole

    Is it possible to enlarge a drilled hole on steel with a round file? How long does it take? Unfortunately my drill is 3/8 (I am using the 3/8 bit) and the hole needs to be about 7/16 in diameter.

    Maybe I am not the first person in this situation.




  • #2
    Buy a turned down bit. Files is all the old timers used...Bob
    Bob Wright

    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

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    • #3
      Of course it's possible. How thick of steel are you needing to waller out? I've done this plenty of times. Also, how precise does it need to be?

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      • #4
        The thickness of the steel is 3/16" and I need to pass a threaded bolt through the hole. As long as the bolt can pass through then it works. As for Bob's comment, I've never heard of a turned down bit, so if you could elaborate.

        Thanks for your comments, guys, they are a great help!

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        • #5
          I think Bob is talking about a 7/16" drill bit with a reduced 3/8" shank. You can get those almost anywhere. It'll fit your drill and give you the hole size you're looking for.

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          • #6
            I get it now, thanks for clarifying.

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            • #7
              Originally posted by Metjunkie View Post
              I think Bob is talking about a 7/16" drill bit with a reduced 3/8" shank. You can get those almost anywhere. It'll fit your drill and give you the hole size you're looking for.
              Some catalogs call them "Silver and Deming" drills, I think the name of the guys who first sold them.

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              • #8
                Originally posted by Aeronca41 View Post

                Some catalogs call them "Silver and Deming" drills, I think the name of the guys who first sold them.
                Silver and Deming was first made in my home town of Salem Ohio. They didn't patent the idea and everyone makes them...Bob
                Bob Wright

                Spool Gun conversion. How To Do It. Below.
                http://www.millerwelds.com/resources...php?albumid=48

                Comment


                • #9
                  Originally posted by aametalmaster View Post

                  Silver and Deming was first made in my home town of Salem Ohio. They didn't patent the idea and everyone makes them...Bob
                  That's interesting--I assume it was the name of a company or machine shop? I know I sure use mine a lot.

                  And Bob, I see you're up to 4 bars!

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                  • #10
                    Sometimes you'll see it listed, for example, as 7/16SD. I have a bunch of them, most over 5/8 though.

                    Glad you finally have some bars Bob. I know you were pretty worried about it.

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                    • #11
                      Originally posted by ryanjones2150 View Post

                      Glad you finally have some bars Bob.
                      Hot dang I am movin up http://vintagemachinery.org/mfgindex...l.aspx?id=1017 ...Bob
                      Bob Wright

                      Spool Gun conversion. How To Do It. Below.
                      http://www.millerwelds.com/resources...php?albumid=48

                      Comment


                      • #12
                        Originally posted by aametalmaster View Post
                        Great stuff, Bob. I always enjoy learning about the history of tools and machines. Thanks!

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                        • #13
                          Originally posted by aametalmaster View Post
                          Great info! Thanks for the link.

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                          • #14
                            I worked in a few of the building that are still standing. One is a union sheet metal shop and the other a foundry...Bob
                            Bob Wright

                            Spool Gun conversion. How To Do It. Below.
                            http://www.millerwelds.com/resources...php?albumid=48

                            Comment


                            • #15
                              A die grinder and carbide bit would make quick work of that.

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