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How to drill a 4" hole in cinder block dean 11-14-2006
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Posted by mm on November 14, 2006, 8:52 pm


On Tue, 14 Nov 2006 16:52:42 -0500, tnom@mucks.net wrote:

>
>>Ok I know i can drill a whole load of little holes in a circle and then
>>knock it out, but is there such a thing as a 4" drill bit that will do
>>this more easily?
>>
>>Thanks!
>>
>>DeanB
>
>Drill a series of small holes and then punch the core out. Purchase
>a half round bastard file. The file isn't meant for concrete but will
>do a nice job in smoothing and accurizing the hole. You may have
>to throw the file away when done, but it will work.

Do they sell card files anymore? I've not noticed one.

Posted by Goedjn on November 14, 2006, 7:02 pm



>Ok I know i can drill a whole load of little holes in a circle and then
>knock it out, but is there such a thing as a 4" drill bit that will do
>this more easily?
>


Why not just punch a cinderblock-sized hole with a 5 pound mallet,
and then stuff mortar in everywhere that's not part of the 4" hole?


Posted by RicodJour on November 17, 2006, 12:32 am


>
> >Ok I know i can drill a whole load of little holes in a circle and then
> >knock it out, but is there such a thing as a 4" drill bit that will do
> >this more easily?Why not just punch a cinderblock-sized hole with a 5 pound
mallet,
> and then stuff mortar in everywhere that's not part of the 4" hole?

Leave it to the architect to go with a figure/ground study. ;)

R


Posted by Father Haskell on November 14, 2006, 8:02 pm



dean wrote:
> Ok I know i can drill a whole load of little holes in a circle and then
> knock it out, but is there such a thing as a 4" drill bit that will do
> this more easily?

1/2" SDS hammer drill and a cold chisel. 4" is nothing.


Posted by Smarty on November 14, 2006, 8:38 pm


I've looked at chisel bits for my 1/2 inch Bosch hammer drill and wondered
if they could make a hole that is anywhere close to round. Can the chisel
bit actually be used for making round (or close to round) holes?

Thanks,
Smarty



>
> dean wrote:
>> Ok I know i can drill a whole load of little holes in a circle and then
>> knock it out, but is there such a thing as a 4" drill bit that will do
>> this more easily?
>
> 1/2" SDS hammer drill and a cold chisel. 4" is nothing.
>



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