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Drilling into concrete #5036253 03/08/19 02:56 PM
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buck91 Offline OP
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Need to make some 5/8” holes in a concrete slab. I have a 5/8” masonry bit which will fit my 1/2” chuck on my hammer drill. What I am unsure of is whether concrete would benefit from a pilot hole or if that would negatively impact the finished hole or drilling process?


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Drilling into concrete [Re: buck91] #5036266 03/08/19 03:04 PM
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CELICA_XX Offline
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I've never used a pilot hole, just from my experience drilling into cinder blocks.


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Re: Drilling into concrete [Re: buck91] #5036274 03/08/19 03:11 PM
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BigCahuna Offline
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I've drilled a million holes in concrete and the thing that causes the most grief, is hitting a bluestone or a piece of rebar.,,

Re: Drilling into concrete [Re: buck91] #5036280 03/08/19 03:18 PM
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barryh Offline
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As masonry drills can wander, I always use a pilot hole for accuracy and it drills easier particularly if your hammer drill is not overly powerful.


Barry

1979 BMW R45 (Triple QX 5W40)
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Re: Drilling into concrete [Re: BigCahuna] #5036362 03/08/19 04:21 PM
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HighbrowHillbill Offline
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Originally Posted by BigCahuna
I've drilled a million holes in concrete and the thing that causes the most grief, is hitting a bluestone or a piece of rebar.,,

This.


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Re: Drilling into concrete [Re: buck91] #5036376 03/08/19 04:33 PM
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Leo99 Offline
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Not all hammer drills are the same. I had a Craftsmen and I struggled to drill into my foundation to hang a TV. It died and I picked up a cheap HF hammer drill. That cheap HF hammer drill is way more powerful than the Craftsmen.

Although, and me an concrete drilling don't get along that well. Can't tell you how many times I've drilled the hole and need another 1/4 inch and it just won't go any deeper.


Without data you're just another person with an opinion. W. E. Deming

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Re: Drilling into concrete [Re: buck91] #5036565 03/08/19 06:57 PM
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Dave9 Offline
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If you need very accurate spacing you might start a very shallow hole with a smaller bit, then switch over to the desired size, but other than that no you don't need a pilot hole.

Re: Drilling into concrete [Re: buck91] #5036571 03/08/19 07:02 PM
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65f100 Offline
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You need a rotary hammer instead of a hammer drill.

Re: Drilling into concrete [Re: 65f100] #5036620 03/08/19 07:33 PM
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ET16 Offline
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Originally Posted by 65f100
You need a rotary hammer instead of a hammer drill.


What? My experience is the opposite.

Re: Drilling into concrete [Re: buck91] #5036766 03/08/19 10:00 PM
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buck91 Offline OP
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Well just finished. My 1/2in hammer drill worked great with a masonry bit. No pilot hole, just started slow and it didn't want to wander at all. Nice tight, clean bore that my anchors grabbed nicely.


2011 F150 4x4 5.0L
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Re: Drilling into concrete [Re: buck91] #5036794 03/08/19 10:48 PM
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HighbrowHillbill Offline
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New safe? coffee


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Re: Drilling into concrete [Re: HighbrowHillbill] #5036820 03/08/19 11:24 PM
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buck91 Offline OP
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Nothing that exciting, just installed a floor anchor to lock my snowblower and genny down.


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