drill in ceiling?

[Sandberg]

Hello again,

this is the Bosch I have:

http://www.clasohlson.se/Product/Product.aspx?id=21569335

And it doesn't work. But now I've borrowed a rotary hammer from a coworker, and it worked great! He had a Bosch (blue) rotary hammer. Forgot to check the model. It had an SDS+ chuck.

Thanks for the reply!

 

[mattiasp]

It doesn't really matter which model from Bosch's range it is since an impact drill by default has difficulties in vibrated concrete as they just bounce there, that's precisely why rotary hammers exist.

/Kent

Yes, it's obvious, but why do impact drills exist at all?? I have managed to drill in day-old concrete with an impact drill, but they are not suitable for real concrete.

 

[jon_h]

Maybe for brick walls and the like? I agree, they are completely useless for concrete.

 

[snuttjulle]

A rotary hammer drill works for brick and plaster. But on the other hand, so does almost a machine without any hammer function at all. I guess the reason they exist is that it was the only variant available for amateurs as long as Hilti held onto the patent tightly (or whatever it was that only they had rotary hammers).

 

[Mikael_L]

Hello again,

this is the Bosch I have:

[link]

And it doesn't work. But now I've borrowed a rotary hammer from a colleague and it worked fine! He had a Bosch (blue) rotary hammer. I forgot to check the model. It had an SDS+ chuck.

Thanks for the answer!

And this is what you should (uhh... must..!!) have to successfully drill in concrete. http://www.clasohlson.se/Product/Product.aspx?id=20193054

I think their cheap Cotech rotary hammer also works fairly well, at least compared to an impact drill, regardless of brand.

An impact drill works for brick and plaster. But on the other hand, almost a machine without any impact at all does too.
I guess the reason they exist is that it was the only type available for laymen as long as Hilti held tight to the patent (or whatever it was that only they had rotary hammers).

But why do impact drills still exist then???
Everyone should buy a rotary hammer with an SDS-regular chuck converter + possibly a battery machine, then you'll solve all drilling tasks (well, most of them anyway) But absolutely no impact drill.

But of course, I've also bought an impact drill in my life, why ??? I probably didn't know any better...

 

[Fein]

During the time I had concrete walls, I only had a green Bosch hammer drill. I drilled a lot of holes in that terribly hard concrete. Compared to using a rotary hammer, you could say it doesn't really work, as it was slow and often required first using a small drill bit to make fine small holes in stones and such, then enlarging it to the desired size. Plus, you had to apply your entire weight on the machine. Nevertheless, you should have high-quality drill bits.
I've experienced times when suddenly it was really quick to drill, only to pull out a completely mangled drill bit from the wall.

 

[Sandberg]

But of course, I've also bought a hammer drill in my life, why??? I probably didn't know better...

No, if I were buying today, I definitely wouldn't buy a hammer drill. The reason I bought it was because I wanted to drill everywhere and use it as a screwdriver. I thought it was good with a cord so you don't have to charge the battery all the time.

But now I noticed that it was useless since it can't drill everywhere, and it's not great as a screwdriver either because the variable speed is hard to manage, it either hardly moves or goes super fast.

The one I borrowed was the "same" as the one in the picture, perhaps just an older version. It was also better with variable speed than my green one, so I should have gone for that one instead.