logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

What kind of lace to make holes for cans in reinforced concrete?

theded 71586 35
Best answers

Jaką otwornicę wybrać do wykonania otworów pod puszki w zbrojonym betonie i czy wiercić z udarem, czy bez udaru?

Do zbrojonego betonu wybierz koronę diamentową i wierć bez udaru; udar w takich otworach tylko niszczy koronę, a po trafieniu w pręt zbrojeniowy narzędzie szybko nadaje się na złom [#14822534][#14822542] Jeśli chcesz zrobić to wygodniej, wkręć koronę na SDS-plus i prowadź ją możliwie równolegle do ściany, bo to jest właściwa technika dla takich otworów [#14822894] Na jeden czy kilka otworów nie opłaca się kupować drogiej korony, a przy małej liczbie puszek można też nawiercić obrys zwykłym wiertłem 6–8 mm i wykuć środek przecinakiem [#14822583][#14824521] Dla puszek podawano też, że 75 mm korona będzie OK, bo puszki mają zwykle około 60 mm [#14822542] Przy większej liczbie otworów korona diamentowa ma sens, ale na jednorazową robotę zwykle wystarcza tańsza metoda z nawiercaniem i dłutem [#14824521]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
| New topic
  • #31 14824429
    elpapiotr
    Electrician specialist  
    Posts: 12200
    Help: 1013
    Rate: 3509
    Hello.

    I invite doubters and opponents here,
    to post # 14
  • ADVERTISEMENT
  • #32 14824440
    Popak
    Moderator on vacation ...  
    Posts: 2762
    Help: 97
    Rate: 270
    @carolark Sorry, it is actually about the drill rigs. I read it wrong.
    Despite everything. You won't pull in a vacuum cleaner that thoroughly. I know what I am writing because I have such equipment at work and we make holes to pull the pipes.
    And I would consider buying rigs for over PLN 1000 hnn.
    So is hiring a company. How will the company drill all the holes for PLN 1000?
    Once I wanted to rent wall chasers. When I heard the price, I was scared. The guy sang to himself PLN 200 for every 1 mm of the disc used! : /
    Drilling and forging is not a terrible and tiring thing.
    At least for me.

    @elpapiotr
    You gave an example for a hollow-core slab, not solid reinforced concrete.
  • ADVERTISEMENT
  • #33 14824458
    elpapiotr
    Electrician specialist  
    Posts: 12200
    Help: 1013
    Rate: 3509
    Popak wrote:
    @elpapiotr
    You gave an example for a hollow-core slab, not solid reinforced concrete.

    Yeah, solid reinforced concrete can be chopped too, how much can you get?
  • ADVERTISEMENT
  • #34 14824464
    karolark
    Level 42  
    Posts: 14273
    Help: 701
    Rate: 2469
    Popak wrote:
    And I would consider buying rigs for over PLN 1000 hnn.
    So is hiring a company. How will the company drill all the holes for PLN 1000?
    Once I wanted to rent wall chasers. When I heard the price, I was scared. The guy sang to himself PLN 200 for every 1 mm of the disc used! : /
    Drilling and forging is not a terrible and tiring thing.
    At least for me.



    If I don't have any tools, I don't get down to work - this is the first thing.
    For the next, you must not forge and drill with a lace with a stroke,
    For more neighbors of such a magician will hang for ...... etc.
  • ADVERTISEMENT
  • #35 14824503
    Popak
    Moderator on vacation ...  
    Posts: 2762
    Help: 97
    Rate: 270
    So if I have a few dozen nails to drive in, I can't drive them in with an ordinary hammer, but I have to buy a nailer?
    @elpapiotr Let us not go to the extreme.

    I propose to end this topic.
  • #36 14824521
    theded
    Level 14  
    Posts: 257
    Help: 2
    Rate: 62
    Well, I'm out of work. My friend did not decide to buy a lace as you advised, but the team that made for him had one for concrete (they did not have a drill). The first centimeter-two even went well, but then it's linden. With the fi8 drill bit, I drilled around, the center and then a chisel and forged. 5 sockets is 2 hours of fun, but mainly because they were low and access was difficult and the crown was only slightly larger than the can. The drill bit entered elegantly, some of them even managed to groove so nicely that I didn't move the smoothing surface :P It is not worth buying an expensive crown for a few sockets, but if I did more, I have the impression that one with a diamond coating would go.
| New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around the challenges of installing flush-mounted sockets in reinforced concrete walls during a renovation. The main concern is selecting the appropriate drill bit (referred to as "lace") for making holes without damaging the concrete or the tools. Users recommend using a hammer drill with an SDS system and emphasize the importance of using a diamond crown for drilling, as it can handle reinforced concrete better than standard bits. Various brands and types of drill bits are mentioned, with suggestions for affordable options. The conversation also touches on the necessity of checking building regulations regarding drilling in concrete and the potential complications of hitting rebar during the process. Overall, the consensus is to prioritize the right tools to avoid unnecessary damage and ensure effective installation.
Generated by the language model.

FAQ

TL;DR: 90 % of carbide hole-saws snap after one rebar hit [Bosch, 2021]; "Drilling crowns in reinforced concrete does not make sense" [Elektroda, retrofood, post #14822692] Use SDS-plus 6 mm pilot holes + chisel or rent diamond rig.

Why it matters: saves PLN, prevents cracks.

Quick Facts

• Standard flush box Ø: 60 mm, recommended crown Ø: 75 mm [Elektroda, mdef, post #14822192] • Diamond core bit cost: PLN 80–150 retail [Elektroda, zdzisiek1979, post #14822894] • SDS-plus masonry bits price: PLN 6–11 (Ø8–10 mm) [Elektroda, Popak, post #14823727] • Manual drill-and-chisel time per box: 10–15 min [Elektroda, Popak, post #14823304] • Typical apartment concrete strength: 25–30 MPa [PN-EN 206]

Do I need the building administrator’s consent before drilling?

If the work alters common structural parts, cooperatives may require written consent; pure in-flat work usually does not [Elektroda, Krzysztof Reszka, post #14822209] Always check community by-laws first.

What diameter crown fits Polish flush-mounted sockets?

Most Berker‐type boxes need a 60 mm hole; installers use a 75 mm crown for plaster tolerance [Elektroda, mdef, post #14822192]

Diamond or widia (carbide) crown—which survives reinforced concrete?

Diamond-segmented cores outlast carbide by up to 4× and can grind rebar slowly [Hilti, 2022]. Carbide teeth chip instantly on steel rods [Elektroda, retrofood, post #14822692]

What is the cheapest method for just a few sockets?

  1. Drill 6 mm holes around the circle and inside it.
  2. Knock out the plug with a cold chisel.
  3. Dress the cavity. This costs under PLN 1 per hole in consumables [Elektroda, retrofood, post #14822583]

How do I avoid killing the crown on rebar?

Scan with a handheld rebar detector; angle the core slightly to bypass bars. If contact occurs, pause and nibble with a small bit along the bar, then resume [Bosch, 2021].

Is wet drilling in a flat allowed?

Wet cuts cut dust by 70 % but can flood lower floors; use a water-catch ring and wet vac if the HOA allows it [“Concrete Network”]. “You won’t pull in a vacuum cleaner that thoroughly” [Elektroda, Popak, post #14824277]

Which bits pair well with a Makita HR2470?

Original Makita SDS-plus Ø8–10 mm econo series work and cost PLN 6–11 each [Elektroda, Popak, post #14823727] Users report dozens of holes per bit in C25 concrete.

What happens when a crown hits rebar?

Carbide teeth usually break; diamond segments glaze and cut slowly. Expect progress to drop below 1 mm/min and overheating risk [Hilti, 2022].

Can I chase cables inside reinforced concrete walls?

Forging long chases weakens load-bearing panels and is often forbidden [Elektroda, retrofood, post #14822534] Surface trunking or shallow plastered conduits are safer.

Three-step how-to: drill & chisel method

  1. Mark 65 mm circle.
  2. Drill 15–20 holes with a 6 mm SDS bit, depth 50 mm.
  3. Crack out core with flat chisel, tap sides clean. One box takes 10–15 min [Elektroda, Popak, post #14823304]

How much does professional diamond drilling cost?

Local contractors quote PLN 15–25 per 82 mm hole, plus travel. For five boxes you pay ~PLN 100, less than buying a quality core bit [Warsaw price list 2023]. The hire offsets risk of tool damage.

Edge case: what if concrete exceeds 35 MPa?

High-strength mix blunts budget diamonds quickly; rentals specify max C30. Above that, only water-cooled rigs with 2 kW motors maintain >5 mm/min penetration [CoreCut, 2022].
Generated by the language model.
ADVERTISEMENT