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Rotary hammer through stone query

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Rotary hammer through stone query

Old 08-27-2011, 12:17 PM
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Default Rotary hammer through stone query

Hi,

I need to make about a 6" depth, 1/2" diam hole into a solid rock (granite quartz mix?) on my property. Cannot use corded or air.

- Would a tool like this be capable of making this hole?
http://www.cpotools.com/bosch-18636-...ce-high-to-low

- Any idea of drilling speed, inches per minute, or even ballpark? (ie, am I out there for 5min, or 1hr?)

- Assuming a bit like this?
http://www.amazon.com/DEWALT-DW5438-...472452&sr=1-10


Thanks much for any advice.
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Old 08-27-2011, 12:24 PM
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Yes.. a good hammer drill and a proper bit will work.
I use them all the time...and deeper than 6"..just take your time and use a carbide tip.
You can also rent a battery hammer drill and bit from many Home Depot centers.

This is the cordless I use..costs a lot less at the Home Depot than what you are looking at..



And for a one time shot..you can even use just a star drill and a hand sledge hammer...just hit and rotate..just like the old time miners used to do.
A lot cheaper for doing just one hole and you will be surprised how well they work...but not of course for multiple holes.

Link to star drills....they have them at the Home Depot also...
http://hand-tools.hardwarestore.com/...ar-drills.aspx

Last edited by semperfifishing; 08-27-2011 at 01:07 PM.
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Old 08-27-2011, 12:39 PM
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If you have to rent a battery powered hammer drill just make sure it's the biggest one you can find, the electric hammer drills the pros use have some balls and in rock that would take 2-4 minutes? Never used a baterry powered one but doubt it would have the power of the electric but I could be wrong on that.
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Old 08-27-2011, 01:01 PM
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If you could rent one of these it will do it easily.

Pionjar 120 gas driven rotohammer rockdrill.

http://www.maystrailequipment.com/pages/pionjar.html

Used to market them to state and local government 30 years ago. Tough, heavy, load, messy and expensive $2,500+/- in 1980 but they would eat through concrete or rock. I used to demo them with a 3.5" rotary carbide bit that went through concrete like a hot knife through better.

Maybe overkill but this is THT
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Old 08-27-2011, 01:04 PM
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http://www.sds-hammer-drill.com/
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Old 08-27-2011, 02:34 PM
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1/2" hole, 6" deep, a good battery hammer drill with a decent bit (SDS), no problem.
Will take less then 5 minutes. Maybe just a a minute or two.

http://www.youtube.com/watch?v=SKDIg...eature=related

SDS has nothing to do with the "drill motor" itself or the type (edit)of drill. It has to do with the end of the drill bit that goes into the drill and how the chuck holds the bit.
SDS= Slot Dip, Slot. This allows for a quick bit change without a chuck key, not to be confused with regular keyless chucks.



.

Last edited by 240 LTS; 08-29-2011 at 11:19 AM.
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Old 08-28-2011, 03:48 AM
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Hammer Drill verses Rotary Hammer:


A 1/2" X 6" hole with Granite in the mix is a pretty tough application for a
18V Hammer Drill...most cordless Hammer drills have 1/2 inch chucks & drive round shank bits. 1/4" diameter and below is the sweet spot. 30,000 BPM (light hammer blows) does well in cinder block. If your are just drilling one 1/2" hole you can do it...you will probably need 2 fully charged batteries.




A cordless Rotary Hammer Drives SDS bits and will make short work of drilling a 1/2" X 6" in a granite mix application. 4100 BPM...hits much hard.

Last edited by bmw332is; 08-28-2011 at 04:24 AM.
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Old 08-28-2011, 04:54 AM
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You WILL fry a 18v cordless...rent/borrow a rotary hammer!
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Old 08-28-2011, 09:11 AM
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Get a generator and a Roto Hammer , I have drilled 10's of thousands of holes with them [ I LOVE REBAR ] and own my own Hilti TE72 .

If your were close I would bring mine over and help ya.
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Old 08-29-2011, 11:00 AM
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Originally Posted by 240 LTS View Post

SDS has nothing to do with the "drill motor" itself or the type ao drill.




.
I'm not going to split hairs but your statement is not correct. You can purchase a normal rotary or a SDS drill.
And IMO, if you are drilling masonry holes, it's a no-brainier to purchase the SDS drill. The SDS chuck DOES NOT slip.
Good Luck with the task.
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Old 08-29-2011, 11:25 AM
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Originally Posted by 240 LTS View Post
1/2" hole, 6" deep, a good battery hammer drill with a decent bit (SDS), no problem.
Will take less then 5 minutes. Maybe just a a minute or two.

http://www.youtube.com/watch?v=SKDIg...eature=related

SDS has nothing to do with the "drill motor" itself or the type (edit)of drill. It has to do with the end of the drill bit that goes into the drill and how the chuck holds the bit.
SDS= Slot Dip, Slot. This allows for a quick bit change without a chuck key, not to be confused with regular keyless chucks.



.
Originally Posted by Cmann View Post
I'm not going to split hairs but your statement is not correct. You can purchase a normal rotary or a SDS drill.
And IMO, if you are drilling masonry holes, it's a no-brainier to purchase the SDS drill. The SDS chuck DOES NOT slip.
Good Luck with the task.
We agree and maybe worded the statement differently.
What I was trying to convey is the SDS is what or how the bit is held by the quick change "chuck" and not so much the "drill motor".

We are on the same page.


.
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