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Drilling Small Holes in Granite

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Drilling Small Holes in Granite Manjo 12-18-2006
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Posted by Manjo on December 18, 2006, 12:02 pm
After reading about granite being a tough stone to drill, I need some
advice.

I've dug a 36" deep hole and dropped in an 8" x 8" x 72" granite
mailbox post. I want to install two wrought iron brackets on one
smooth side to support the mailbox.

Each brackets has four (4) holes on the vertical arm to be used to
screw the bracket to a willing material. I want to drill holes in the
granite post to hold each bracket. I plan on applied Gorilla Glue to
the back of the bracket to make sure the bracket stays attached to the
granite post.

QUESTION: what type of power drill and drill bit must I use to drill
small 3/32" to 1/8" diameter holes (about 3/4" deep) in the granite
post?

TIA for your tips, suggestions, comments,

Manjo


Posted by Deputy Dumbya Dawg on December 18, 2006, 2:39 pm
Hammer drill with compatible bit.

: After reading about granite being a tough stone to
drill, I need some
: advice.
:
: I've dug a 36" deep hole and dropped in an 8" x 8" x
72" granite
: mailbox post. I want to install two wrought iron
brackets on one
: smooth side to support the mailbox.
:
: Each brackets has four (4) holes on the vertical arm
to be used to
: screw the bracket to a willing material. I want to
drill holes in the
: granite post to hold each bracket. I plan on applied
Gorilla Glue to
: the back of the bracket to make sure the bracket
stays attached to the
: granite post.
:
: QUESTION: what type of power drill and drill bit
must I use to drill
: small 3/32" to 1/8" diameter holes (about 3/4" deep)
in the granite
: post?
:
: TIA for your tips, suggestions, comments,
:
: Manjo
:



Posted by Manjo on December 19, 2006, 11:13 am
Thanks Deputy. Any sugggestions on type and/or brand of drill?

BEst regards,

Manjo

Deputy Dumbya Dawg wrote:
> Hammer drill with compatible bit.
>
> : After reading about granite being a tough stone to
> drill, I need some
> : advice.
> :
> : I've dug a 36" deep hole and dropped in an 8" x 8" x
> 72" granite
> : mailbox post. I want to install two wrought iron
> brackets on one
> : smooth side to support the mailbox.
> :
> : Each brackets has four (4) holes on the vertical arm
> to be used to
> : screw the bracket to a willing material. I want to
> drill holes in the
> : granite post to hold each bracket. I plan on applied
> Gorilla Glue to
> : the back of the bracket to make sure the bracket
> stays attached to the
> : granite post.
> :
> : QUESTION: what type of power drill and drill bit
> must I use to drill
> : small 3/32" to 1/8" diameter holes (about 3/4" deep)
> in the granite
> : post?
> :
> : TIA for your tips, suggestions, comments,
> :
> : Manjo
> :


Posted by John Reddy on December 20, 2006, 6:01 am

> Thanks Deputy. Any sugggestions on type and/or brand of drill?
>
> BEst regards,
>
> Manjo

As you probably won't be drilling a lot of holes in granite beyond
these, I recommend that you rent a hammer drill for a day.

Posted by Deputy Dumbya Dawg on December 21, 2006, 3:01 pm
Harbor freight has a hammer drill for $13.00 on sale
now and then---$29 normally. The appropriate "hammer
drill bit" will cost almost as much. It works fine for
an occasional hole. If you want to do this for a living
get the Milwaukee hammer drill for 10 times that
amount.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=45338

For real holes like boarding through the footings to
set anchors etc, get a rotary hammer. Harbor freight
has a nice one on sale for 40-60 now and then regular
$90. I got the SDS rotary hammer and the 12" bit set
for <$75, what it would cost to rent such from home
depot, drilled 21 1/2" dia 4" deep holes and now I own
the thing. I used it in hammer ( think jack hammer)
mode to trim off some spill over concrete that was in
the way too. Goes into 25 year old concrete like it is
wood. If you are a termite guy and will be drilling a
hundred holes a day five days a week get the Milwaukee
version for $500.

My project required me to do the holes a few a day over
a week so I would have spent much more renting than
buying the inexpensive "throw away" tool...... and I
still have it
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=41983

No I do not work for harbor freight but they have a
store about 5 miles from my house in Atlanta.


Peace
Dawg

message
: In article
:
: > Thanks Deputy. Any sugggestions on type and/or
brand of drill?
: >
: > BEst regards,
: >
: > Manjo
:
: As you probably won't be drilling a lot of holes in
granite beyond
: these, I recommend that you rent a hammer drill for a
day.



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