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Posted by dean on November 14, 2006, 4:17 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?
Thanks!
DeanB
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Posted by Newsreader on November 14, 2006, 4:29 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?
>
> Thanks!
>
> DeanB
>
Certainly is. It's called a core drill. Available in wet versions or dry
versions. The cleanest, most efficient, and easiest drilling is a wet
diamond bit. Problem is, the cost hundreds of dollars, and require
either a special drill that directs water into the center, or a water
swivel attachment for a conventional drill.
Dry core bits work much slower, and cost a lot less.
Do you need a very clean & accurate hole? If not, save your money &
punch it out with a series of 3/8" holes & a chisel.
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Posted by barry@muckleshed.com on November 14, 2006, 4:31 pm
Yeah. Try larger builder merchants and/or plumbers merchants. They
can be quite expensive, so try to befriend someone who can get
wholesale.
Over in England they range from =A320 to =A3100's, but my father got one
from a "wholesale" buddy for less then =A310.
Having said that, if it's just one hole, then i'd be tempted to just do
the pin cushion drilling as you described.
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Posted by on November 14, 2006, 4:52 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?
>
>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.
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Posted by hallerb@aol.com on November 14, 2006, 5:04 pm
hamilton tool beaver falls pa sells surplus diamond core bits fo 25
bucks a inch, a real bargain.....
they sell mail order and are good to deal with
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