How to accurately drill a side hole in a round workpiece

How to accurately drill a side hole in a round workpiece

Sometimes, when making various homemade products, it is necessary to drill a perfectly positioned hole on the side of the tube or rod. This cannot be done without prior preparation and tools. The main difficulty is finding the geometric center of the future hole. Below we will consider one way to do this in practice.
How to accurately drill a side hole in a round workpiece

Required tools and materials


We will need:
  • hacksaw for metal;
  • tabletop drilling machine;
  • punch and hammer;
  • collet chuck;
  • center drill;
  • regular twist drill with a diameter of 2.5 mm;
  • metalworking and mobile vices;
  • aluminum rod with a diameter of 10 mm;
  • a piece of coarse sandpaper;
  • cutting fluid (coolant).

The procedure for drilling a transverse hole in a workpiece


There are many ways to do this. In our case, we use part of the rod itself as a conductor, having previously processed it.
1. Clamp the rod in a vice and use a hacksaw to cut off a small piece about 20 mm long.
How to accurately drill a side hole in a round workpiece

2.We insert and clamp the sawn-off part of the workpiece in the drill chuck with the cut side down.
How to accurately drill a side hole in a round workpiece

3. Place sandpaper on the table of the drilling machine and, holding it with your fingers, turn on the spindle of the machine and press the end of the piece of rod against the sandpaper until a flat and smooth surface is formed.
How to accurately drill a side hole in a round workpiece

How to accurately drill a side hole in a round workpiece

4. Using a punch and a hammer, mark the geometric center at the end of the blank of the future conductor.
How to accurately drill a side hole in a round workpiece

5. Re-insert and clamp the workpiece with the punch end down in the chuck of the drilling machine.
How to accurately drill a side hole in a round workpiece

6. Then we fix the collet chuck mandrel in a movable vice, clamp the centering drill in it and align it, moving the vice, exactly under the punched place in the piece of the rod.
How to accurately drill a side hole in a round workpiece

How to accurately drill a side hole in a round workpiece

How to accurately drill a side hole in a round workpiece

We turn on the machine and finally determine the location of the future through axial hole, which we then finally form with a 2.5 mm twist drill.
How to accurately drill a side hole in a round workpiece

7. We place the rod in a bench vice, and on top of it we place perpendicularly a cut piece of the same rod with a central axial hole, a kind of jig.
How to accurately drill a side hole in a round workpiece

8. Securely clamp both elements in the jaws of the movable vice. Pour some coolant into the hole. We center the homemade jig by moving the vice relative to the drill and drill a hole in the side of the workpiece.
How to accurately drill a side hole in a round workpiece

How to accurately drill a side hole in a round workpiece

9. By changing the position of the conductor cylinder on the rod, you can make any number of transverse holes, if necessary.
How to accurately drill a side hole in a round workpiece

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Comments (12)
  1. Guest Mikhail
    #1 Guest Mikhail Guests 20 March 2019 13:41
    2
    Great, I'll keep that in mind if necessary.
    1. Cheap scam
      #2 Cheap scam Guests March 22, 2019 06:32
      3
      Cheap scam. The accuracy of lateral drilling depends on the accuracy of axial drilling. It would be better if the author proposed a method for precise axial drilling without a machine
    2. Stainless steel
      #3 Stainless steel Guests 4 September 2019 20:18
      0
      Elementary. A profile for plasterboard is attached to the pipe with clamps, on which markings are made and drilled through this profile.
  2. Captain Green
    #4 Captain Green Guests 20 March 2019 15:15
    6
    The idea is certainly interesting. But finding the center at the end of the cylinder is also not a trivial task, IMHO...
    1. Guest Sergey
      #5 Guest Sergey Guests March 21, 2019 00:42
      2
      This does not require high precision, since the subsequent drilling principle is self-centering.
    2. Stainless steel
      #6 Stainless steel Guests May 20, 2019 09:17
      1
      Elementary, Captain Green. Send me your address. I'll send you a sketch of the device. Stainless steel
  3. bones
    #7 bones Guests 20 March 2019 16:08
    15
    It's hard to think of something dumber and more complex. Clamp any cylindrical workpiece in a vice so that it protrudes above the jaws. Take a strip of metal by the edges in both hands (a corner, an old small file, etc.) and hold it horizontally across the workpiece. You will get a line exactly in the center, along the entire length of the workpiece.Even if you have problems with coordination in space and it’s difficult to catch the horizon, the error will be tenths of a millimeter.
  4. ilik54
    #8 ilik54 Guests March 21, 2019 11:41
    0
    Or you can simply take a metal block, preferably heavy, so that it is difficult to move. Then use a grinder to cut out a triangle in it, it is better that the angle is 60 degrees, this will help in the future to drill a hole in the plane of the hexagonal head of the bolt. In the meantime, we continue, since the block is heavy, we place it under the drilling machine so that the drill with its end exactly enters the center of the cut triangle. Then we take a tube or a round piece, insert it into the triangular cutout and drill. According to all laws, if we did everything accurately and correctly, the hole in the round parts will be centered. Good luck, handy and big-headed!
    1. Guest Yuri
      #9 Guest Yuri Guests March 22, 2019 10:07
      1
      This attachment is called a prism and is produced serially. And it must be marked as Kostya wrote, so as not to drill in a spiral.
  5. biglo
    #10 biglo Guests March 23, 2019 06:30
    0
    Is it weak or too lazy to buy a conductor?
  6. Guest Vitaly
    #11 Guest Vitaly Guests 24 March 2019 20:20
    1
    Everything is done simply. A round piece and a straight strip are clamped in a vice. using a barbell we take the half diameter and thickness of the strip. draw and get the ideal center
  7. Guest Alexander
    #12 Guest Alexander Guests 25 March 2019 20:32
    3
    I liked it, it's not that difficult and it turns out pretty accurate. Well done.