How to make square holes with round drills, a method accessible to everyone

When manufacturing various mechanisms, it may be necessary to drill a square hole. There is a Watts drill for this, but not everyone has it. If purchasing it is not practical, then using simple technology you can make a square hole using ordinary metal drills.
How to make square holes with round drills in a way accessible to everyone

Tools:


  • center punch;
  • hammer;
  • drill or drilling machine;
  • center drill;
  • basic drill 4 mm or larger, depending on the size of the square hole required;
  • a large drill with a diameter 1 mm smaller than the side of the future square;
  • metal file.

Drilling a square hole


For ease of work, you need to cut out a square template from paper, but smaller than the required hole by the diameter of the main drill. For example, if you need a square of 10x10 mm, and a 4 mm drill will be used as the main one, then the template is cut with sides of 6x6 mm.
How to make square holes with round drills in a way accessible to everyone

Important! When choosing the main drill, you need to ensure that its 2 diameters are slightly smaller than the side of the template.In this case, when drilling, the holes will not overlap each other and the drill will not jump off the desired point.
The paper square is glued to the workpiece with tape. Using a punch, clear deep notches are applied in its corners and center. Afterwards the template is removed.
How to make square holes with round drills in a way accessible to everyone

The notches are lightly drilled out with a centering drill.
How to make square holes with round drills in a way accessible to everyone

Next, you need to make through holes along the corner marks. Ideally, use a drilling machine, since working with a drill may reduce accuracy. If you need to drill through thick metal, you will definitely need oil to cool the edge of the drill.
How to make square holes with round drills in a way accessible to everyone

How to make square holes with round drills in a way accessible to everyone

After the corners are ready, using a large drill, a central notch is drilled between them. This allows you to choose the metal in the middle. The result is a blurry square hole.
How to make square holes with round drills in a way accessible to everyone

How to make square holes with round drills in a way accessible to everyone

Using a needle file, flat or triangular file, the hole is brought to the correct square. Particular attention should be paid to rounding the corners to grind them down to 90 degrees. It is advisable that the width of the file corresponds to the side of the square hole, then it will be possible to carry out the boring almost perfectly.
How to make square holes with round drills in a way accessible to everyone

How to make square holes with round drills in a way accessible to everyone

This drilling method is labor-intensive and takes at least half an hour, taking into account finishing with a file, but it allows you to get a fairly high-quality hole. Its main advantage is the ability to get by with a meager set of tools without the need to purchase a Watts drill.
How to make square holes with round drills in a way accessible to everyone

How to make square holes with round drills in a way accessible to everyone

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[media=https://www.youtube.com/watch?v=VJmnE4Vu5Gs]
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Comments (11)
  1. Guest Gennady
    #1 Guest Gennady Guests 13 June 2019 18:48
    2
    where to buy watts drills?
  2. Guest Alexander
    #2 Guest Alexander Guests 14 June 2019 07:54
    3
    The Watts drill also requires a slotting machine.
    1. Igor
      #3 Igor Guests 25 July 2019 22:10
      0
      then it's not a drill, but a slotting cutter
  3. Guest Oleg
    #4 Guest Oleg Guests 14 June 2019 22:34
    4
    patstalom! LOL! karochi: from the point of view of materialistic dialectics, we have no right to ignore the issue of paradoxical tendency!
  4. Guest Sergey Davydov
    #5 Guest Sergey Davydov Guests 16 June 2019 10:42
    2
    To make a hole with a Watts drill, you need a square hole template, which also needs to be made and it is used for drilling soft materials - wood and plastic. There's no way to drill through metal this way, you'll probably rip your hands off! Lubricating a drill with oil is completely nonsense! Only some types of steel during processing are doused with kerosene or diesel fuel containing oil, in particular stainless steel. If you pour oil on a tool when processing ordinary steel, you will have to work in a gas mask, and after such work you will most likely have to throw the tool away). The author seems to be a loser if he doesn’t know such basic things, but gives out advice
  5. Guest Vladimir
    #6 Guest Vladimir Guests 18 June 2019 09:39
    3
    What is a center punch? Previously, when marking, competent people always used a core, not a center punch!
    1. Igor
      #7 Igor Guests 25 July 2019 22:14
      0
      punch (core) - a tool for marking. What is a core?
    2. Igor
      #8 Igor Guests 25 July 2019 22:18
      0
      core rock. Mechanics always use a center punch.
  6. Guest Mikhail
    #9 Guest Mikhail Guests 18 June 2019 19:36
    2
    as usual, in order to make an instant 31 out of a steam locomotive, you need to fine-tune it with a file
  7. Vadim
    #10 Vadim Guests 19 June 2019 18:22
    4
    you have to write like this - How to make square holes with round drills - but in reality you just show how to do ordinary plumbing work with a file. Boring the hole to the desired size and desired configuration. This was taught in the first year of college. The “master” apparently finally learned this method. In 10 years, he’ll probably learn about bending, and then maybe someday he’ll get to straightening...AND CORE!!! not a center punch. And why centering??? Or are your hands hooked?
  8. Igor
    #11 Igor Guests 25 July 2019 22:04
    1
    and where is the drilling of a square hole? I see drilling of round holes and sawing out of a square hole.