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How to drill a 4" hole in cinder block dean 11-14-2006
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Posted by Father Haskell on November 14, 2006, 9:12 pm


Smarty wrote:
> 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?

Rough it out maybe 1/2" undersized and clean it up. It's masonry
work, it's going to be rough.


Posted by Smarty on November 15, 2006, 8:55 am


Thanks for the advice. I did not know how the chisel bits were used and know
I understand. Thanks again!

Smarty

> Smarty wrote:
>> 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?
>
> Rough it out maybe 1/2" undersized and clean it up. It's masonry
> work, it's going to be rough.
>



Posted by marson on November 14, 2006, 8:39 pm



Father Haskell wrote:
> 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?
>
>someone has already pointed out coring bits. if you want a neat hole badly
enough, you could look in the yellow pages. there are companies out there that
cut and drill concrete. you might even be able to rent a bit.


Posted by John Grabowski on November 15, 2006, 7:37 am


Try here:
http://www.dynatech-diamond.com/dynatech/showprod.cfm?DID=7&ObjectGroup_ID=6&CATID=4



> 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
>


Posted by Kyle on November 16, 2006, 1:01 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?

I've seen a lot of recommendations for various drills, but what about
marking the hole and using a rotary zip saw to cut it? I'm sure there
are masonry bits available for those larger zip saws, considering even
my little Dremel tool has such a thing for small masonry cuts.


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