[olug] Drilling Concrete Block-I'm doing it wrong
obiwan at jedi.com
Fri Jan 3 16:59:48 CST 2020
[I tried to send this earlier, but I think I hit the wrong button.]
Right. Masonry bits have that carbide tip that's meant to chisel, not
scrape, its way through concrete. It has to be used with a hammer
drill. The helical threads on the bit are meant to extract the dust,
not to cut through the concrete.
I have masonry bits that are decades old and have been used many
times... but always with a hammer drill. They can make pretty quick
work of either concrete block or (more commonly) the grout between the
After you drill the hole, be sure to use either a plastic screw anchor
(for standard screws) or a tapcon screw, which needs no anchor.
On 1/3/20 4:22 PM, Kevin Neubauer wrote:
> Agree with Justin. You need a hammer drill to be effective at it. You also
> have to go slow with the rotation speed and apply moderate pressure, but
> not so much pressure you break the bit. You'll burn up masonry bits quick
> if you try to zip the hole in like you do with wood. If you have lots of
> holes to drill, rent or borrow a larger SDS rotary hammer drill.
> On Fri, Jan 3, 2020 at 4:15 PM Justin Reiners <justin at hotlinesinc.com>
>> Are you using a hammer drill? It increases speeds a ton when drilling
>> block, if it's block grout is much easier to drill than the block itself.
>> On Fri, Jan 3, 2020, 4:13 PM Dave Thacker <dthacker9 at gmail.com> wrote:
>>> I'm in the process of mounting a shelf of homelab equipment on a concrete
>>> block wall in my basement. I grabbed a masonry bit from Menards, and
>>> started drilling with my Ryobi cordless. While I expected drilling a
>>> would take much long wood, I didn't expect to take a single hole would
>>> take over 20 minutes. When I started the second hole, I got about 3/4"
>>> and the bit...melted. I've now got a bit fragment stuck in the second
>>> - How long should a masonry bit last? New bit very hole?
>>> - Is there a better quality bit I should be using?
>>> Dave Thacker
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>>> OLUG at olug.org
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*Ben "Obi-Wan" Hollingsworth* obiwan at jedi.com <mailto:obiwan at jedi.com>
The stuff of earth competes for the allegiance I owe only to the
Giver of all good things, so if I stand, let me stand on the
promise that You will pull me through. /-- Rich Mullins/
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