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Drill correctly
Drill correctly

Video: Drill correctly

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Video: 11 DRILLING TIPS AND TRICKS (And Mistakes To Avoid!) 2023, February
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We have summarized for you in a few steps how to proceed correctly when drilling to avoid oblique or too large holes.

Table of contents Table of contents Drilling correctly: This is how the drill hole becomes perfect

  • Which tool do you need for drilling?
  • Before drilling: Check the wall and material
  • How do you find cables in the wall?
  • Instructions for drilling in 6 steps
  • Special case: drill into tiles
  • When something went wrong while drilling

Table of contents Table of contents Drilling correctly: This is how the drill hole becomes perfect

  • Which tool do you need for drilling?
  • Before drilling: Check the wall and material
  • How do you find cables in the wall?
  • Instructions for drilling in 6 steps
  • Special case: drill into tiles
  • When something went wrong while drilling

In practice, drilling is often more difficult than expected. The correct handling of a drilling machine requires practice and a lot of know-how: Once it has been set up incorrectly, the borehole becomes crooked, too large and unusable. Not to mention the choice of a suitable drill - suitable for the material - and the corresponding dowels and screws. To ensure that even inexperienced craftsmen achieve perfect results when drilling, we have summarized the basic rules and the individual steps in a guide for you.

Which tool do you need for drilling?

The choice of drill and drill attachments depends on the material in which you want to drill holes. Using the wrong tool increases the risk of injury and the drill holes do not serve their purpose. Professional do-it-yourselfers have the right device or the right drill for every material: there are stone drills, wood drills, drills for metal, drills for concrete and many other practical tools. Conventional drills are suitable for drilling in plasterboard, wood or aerated concrete, an impact drill is required for harder surfaces such as natural stone or brick. Use a rotary hammer to drill holes in concrete. Tip: Many of these devices can also be borrowed from the hardware store.

When purchasing a drill, it is worth comparing the different models and taking them in hand. In addition to the dead weight, the number of blows, a safety clutch (which protects against overload) and the idling speed, you should also make sure that the vibration values ​​are low - this makes work easier and ensures precise drill holes.

Bosch Schlagbohrmaschine UniversalImpact 800
Bosch Schlagbohrmaschine UniversalImpact 800

Also invest some time in the selection of suitable dowels. There are big differences, depending on whether they are intended for use in wood, wall panels or plasterboard. For example, special expansion anchors are used for porous masonry. With smaller bores, you are usually on the safe side with all-purpose dowels.

Before drilling: Check the wall and material

Before you start drilling, you should carefully examine the surface into which the hole will be drilled. This is the only way to find out which drill and which attachment you need. Professionals knock on walls. A rule of thumb says:

  • A hollow sound indicates thin walls, usually made of plasterboard.
  • A dull, flat sound is a clear indication of a solid wall made of sturdy masonry, concrete or stone.

How do you find cables in the wall?

Before drilling into the wall, you should definitely find the water and power lines. You'd be surprised how many short circuits and water damage can be attributed to a small borehole! Ideally, you should use a line locator, i.e. a digital locating device that detects and displays all lines in the wall. Reinforcing steel (reinforcing bars) can also be localized and avoided.

Bosch Professional Digitales Ortungsgerät GMS 120
Bosch Professional Digitales Ortungsgerät GMS 120

For your orientation: Power lines are usually installed in so-called installation zones and run vertically or horizontally through the walls. The likelihood of encountering a power line is greatest near sockets (horizontally and vertically from it), near skirting boards or under the ceiling. Make sure you secure yourself before drilling!

Instructions for drilling in 6 steps

A clean borehole can be obtained in just a few steps. The size of the drill can be derived from the diameter of the anchor. Basically, a smaller drill is used for porous walls, as they are often found in old buildings - the holes are usually somewhat larger than planned due to the crumbling structure. Experience has shown that even large holes are best drilled by starting with smaller holes and gradually approaching the final size.

Good to know: Sometimes it is not easy to get the drill out of a deep borehole that was drilled into a solid wall or other very solid materials. Avoid jerking in the hole with the drill or pulling it with all your might - most devices have a return function with which the drill can easily slide out of the wall again. So the well is not ruined afterwards.

Werkzeug
Werkzeug

If you follow a few rules when drilling and use the right tool, you will have no problem with achieving a satisfactory result.

Photo: iStock / unclepodger

And this is how you drill properly:

  1. Mark drill hole: Measure exactly where you want to drill and mark the drill hole clearly visible.
  2. Make sure there is enough space: For your own safety, clear the place where you want to drill and remove all pitfalls.
  3. Take a safe stand: To achieve a perfect result, you should take a safe stand position. Stand with your face to the wall, one leg is forward (lunge).
  4. Set the depth of the borehole: Many drills have a depth limiter that prevents you from drilling too deep. Just set it to the desired depth before you start. The drilling depth depends on the length of the dowel plus three to five millimeters. If your tool does not have a depth limiter, you can also mark the drilling depth with an adhesive tape on the drill attachment.
  5. Test suitability in the rotary gear: If you are unsure about the nature of your surface, you can first test in the rotary gear whether the attachment is the right one. Only then is the striking mechanism switched on.
  6. Hold and guide the drill correctly: Hold the drill straight when drilling and position it at right angles to the wall. If the tip of the drill can no longer slide off, insert it into the wall with even pressure and with little effort.
Einhell Bohrhammer-Set RT-RH 32
Einhell Bohrhammer-Set RT-RH 32

Another tip: Get support when drilling. A second person can directly collect the dirt that is generated during drilling with the vacuum cleaner, so that it does not fall into cracks, corners or furniture that are difficult to access. If you work alone, you can put a bag or something similar under the borehole, which at least catches the worst.

By the way, professionals also vacuum the borehole before the dowel is inserted. This increases the hold in the opening.

Special case: drill into tiles

Drilling holes in tiles is a tricky business - even professionals keep cracking or shattering the delicate wall panels. In a first step, check whether lines run through the wall. The further procedure is as follows:

  • Mark the drill hole with a pen that writes on the smooth surface but is water-soluble.
  • Slightly scratch the glaze / surface seal at the point.
  • Stick transparent tape over the drill hole: Prevents the drill from slipping and prevents splintering.
  • Those who can use a guide for drilling.
  • It is always best to drill in tiles without hammer mechanism, which reduces the risk of them shattering.

Note: Which drill you use depends on the scratch hardness of the tiles. There are ten degrees of hardness. The best results when drilling are achieved on tiles with a water-cooled diamond drill, tile drills or glass drills are cheaper.

S&R Fliesenbohrer, Glasbohrer, Keramikbohrer Set
S&R Fliesenbohrer, Glasbohrer, Keramikbohrer Set

When something went wrong while drilling

If a borehole has become too large, filler compound can help. Simply put some of it in the opening and only then insert the dowel and screw. It is important, however, that you let the mass dry out well before loading the screw. There is also a special filler for holes in tiles. If the tile has cracked during drilling, tile stickers help briefly. In the long run, there is no way around replacing the tiles: the penetrating moisture would attack the masonry and lead to mold or worse.

Ulrike Hanninger Redaktion Haus.de

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