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Probably took me 10 minutes each hole because of all of the bit swapping. Caused by the hard aggregate in the slab concrete. I first drilled a 1/4 inch hole. Sure a Hilti would have done a hole in 30 seconds and it should for what it costs. Then drilled it out to 3/4 inch in steps using 1/8 inch larger drill sizes. Needed to make 3, 3/4 inch holes 4 inches deep in a concrete slab.
This drill worked fine using Bosch Blue Granite carbide bits. The Bosch bits took it all in good shape. A 60 year old concrete slab. For the last 3/4 inch hole I used a bit made NOT by Bosch and the carbide tip chipped badly on the second and third holes. Other choice was to rent a Hilti for about half of what the Bosch cost. I mention the age because as concrete ages it continues to harden.
That hole actually was the slowest hole to drill.
But I think I'll try the Milwaukee hammer drill next. Second only to Hilti. I hear good things about their rotary hammers too.
I did have it for a few years but it didn't get a lot of use. Overall, I'm a big fan of Bosch tools. I have to join the others to report that my drill burned out drilling 5/32" holes in concrete for Tapcon screws.
I love the planer, jig saw and angle grinder. It has a five year warranty and I'll be sure to hold on to my receipt. The only mitigating factor here is that I did use the drill to mix thin-set mortar and drywall compound about a dozen times.
I was careful not to stress the motor too much when doing this, but it could have caused the early failure.
again. Found Amazon.com to have best price on the internet, Drill came double boxed on date stated when ordered. Will use Amazon.
In addition, the chuck kept loosening on me.My first Bosch tool and my last. I was drilling 3/4" dia holes 2 inches deep in concrete to install a pool cover when the drill just died. First thought my extension cord was unplugged.I have 14 of the 22 hoes complete and had to shut down.I had drilled about ten 3/8" dia by 3" deep holes about two months ago.
I am not a pro but I expect this drill would handle this type of job every day for some time. It was "reconditioned" so I was a little concerned but it perfomed like a marvel for the price. I bought this drill to install a gate in a sidewalk. It drove (8) 3/8" wedge anchors 2" into my sidewalk with no trouble in well under an hour.
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