How to enlarge hole through cinder block?

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Old 11-07-11, 12:52 PM
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How to enlarge hole through cinder block?

Hi,

I need to enlarge a hole through cinder block from just below 1" to just above 1" diameter. How do I best go about this?

Two ways I have thought of are using a masonry drill bit in a regular power drill (I don't have a hammer drill). I though the power drill should be able to handle this job; it's not like drilling a totally new hole.

Alternatively, I could use a half-round rasp to make the hole larger. It'll take longer and is more tedious, but if it works then I'd be happy.

Any advice?

Thanks!
MM
 
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Old 11-07-11, 01:47 PM
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Masonry bit and drill should work fine. They kind of self center because of the cutting edges being on the tip. Now, I assume it doesn't have to be exact? And you can drill from both sides?
 
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Old 11-07-11, 02:06 PM
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Originally Posted by Gunguy45 View Post
Masonry bit and drill should work fine. They kind of self center because of the cutting edges being on the tip. Now, I assume it doesn't have to be exact? And you can drill from both sides?
Yes on both accounts: it doesn't have to be exact, and I can drill from both sides.

Sounds good. So now where do I find a 1" drill bit for normal power drills...
 
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Old 11-07-11, 03:21 PM
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You'll need a stepped shank masonry bit for it to fit a typical drill...you'll prob only find a 1/2" shank..so check your drill.

Might want to check a rental store...prob cheaper to rent the drill and/or bit for a couple of hours than to buy the bit.
 
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Old 11-07-11, 05:30 PM
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Check to see if Harbor Freight has a cheap bit you can use. Earlier this year I needed to bore some long 1" diameter holes through concrete. 12" long brand name bits were quite expensive so I got a couple packs of 12" bits from Harbor Freight. Because of the really cheap price I got a replacement set up front knowing I'd kill a bit but much to my surprise those cheapo bits are still going strong. I can't recall if the set of bits stepped down to 3/8" or 1/2" but it might be worth a look.
 
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