Gilby

I just want to get some feedback on what kind of hammer drills people prefer. We use Hilti's and Bosch's. They are both alright but they just don't drill fast enough. If you have any product you could recommend please let me know. Thank YOU

SLSTech

What does a roofing contractor need with a hammer drill - what are you drilling (new or old concrete, etc...), how deep, how many holes?

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Gilby

When we install a roof on a concrete deck. Genearlly it depends on how deep and how many depending on the roofs size but as a base amount I will go with 1,000 holes about 5 inches. I would say the concrete is old other wise we would not be re-roofing it.

Cole82

This is what my masonry guy uses.
http://www.csunitec.com/rotary/airro...ml#2inchhammer

SLSTech

Wow, that exceeds any equipment that I can think of - but here is more info about what Cole mentioned

http://www.highbeam.com/doc/1G1-128975215.html - time to find a rolling stand like they use for core drilling, I don't think I could handle a day of nothing but bending over & drilling holes

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Double-A

That is why I never entered the pron business or the oil bidness.

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Inner10

I have 2 hilti's and a makita, hilti is far superior and from what I've heard the Bosch's are just as aggressive as the Hilti's. What size holes are you typically drilling? Anything I do the combihammer is plenty fast.

Cole82

Holly crap no wondder he won't let anyone touch that thing.
It's $2,000
http://hydraulictools.zoair.com/view...-hammer-drills

Chris Johnson

Matabo or Walter, what ever they are calling themselves these days. By far the most superior hammer drill

Core drill use Hilti

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Blackcloud

I have a hilti te-7c, te-76atc, and a hilti core drill

Inner10

May I suggest the Metabo Porsche Designed Hammerdrill?

I don't know if it drills worth bunk, but that way atleast you look good doing it!

http://www.carbonfibergear.com/metab...r-multihammer/

http://www.acetoolonline.com/Metabo-.../met-p7911.htm

Just look how it plows through that beautiful hardwood!

WarriorWithWood

Now see.....why didn't Hitachi go to Porsche instead of Alienware for design consultation? If that thing actually drills half as good as it looks I'd buy it.

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Gilby

I like the Hilti's more thnan the bosch's I drill holes about 3/16 to 7/32 it depends but they hit hard when you drill they just dont have that high of rpms

Inner10

Looks sexy but awkard, judging by the picture it looks like the drill is held upside-down (judging by the trigger position).

KennMacMoragh

What models specifically are you using? Hilti and Bosch make a wide range. You're doing commercial work, so it's going to be a higher strength concrete than residential. And the concrete is old, that makes it even worse. But you're drilling straight down which is an advantage, so I think the heavier the better.

For what you're doing I'd say just about any big rotary hammer with a spline drive would be good. I am not fond of the Bosch though, I think they have a problem with their clutches, they seem to slip easy and are slow. I like Hilti's but they are really expensive.

Inner10

Ahh pinholes, the big guys are pretty usless for little holes like that. I find even my TE-25 has a little too much stonk for thoes holes. I think the bigger drills turn a little slower then the smaller ones, yet have alot more punch.

I'm not sure what models you have but the TE-2 and TE-5 work just great for thoes sizes, I really don't know of anything better. What slowes me down is when the holes don't clear-out properly during drilling and you have to keep pulling the bit out and pushing it back it. Hilti's metric quad-cutting bits start easyer, clear-out better and drill faster then the old ones.

No chance you could just shoot you're fastners in?

KennMacMoragh

Oh, I didn't see that before, how small the holes are that he's drilling. I find with the big ones you can snap the bit easy, turn it slightly and there goes your bit. But I can see how that would be a problem if you want to drill small holes into really hard concrete.

Gilby

We have that problem all the time having to pull the bit out and put it back in. It is just a pain in the ass and if you dont know what your doing you burn up alot of bits. These bits are like 32.00 a piece. I mean I though about trying an Air Drill but Most of the time I cant blow threw the concrete so I dont know.

KennMacMoragh

Yep, cutting or drilling through concrete is a pain in the ass. If it's a 5 inch deep hole, 1/4" size, I'm sure you'll have to pull the bit in and out no matter what kind of drill you use. You'll get too much concrete jammed in the bit if you don't.

I don't know if there really is a roto hammer designed for drilling small holes in tough concrete. I think the big ones are geared lower so they spin slow, making it not good for small holes. The smaller ones probably just don't have the power to go through old commercial concrete fast.

KillerToiletSpider

A Hilti TE-7 with the optional dust extraction system will solve your problem.

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