![]() ![]() Thanks for the feedback and thoughts, much appreciated. So I put a new 2 bit in my Bosch 1191VSR drill and switch it into hammer drill mode. ![]() Next the instructions say to drive the screw in with a 2 Phillips head bit. Did that with a Bosch Bulldog SDS that part was easy. For professionals drilling through concrete and other hard surfaces on a regular basis, the Bosch Bulldog hammer drill (US196.95, Amazon), as well as the. ![]() I’ve drilled steel I-beams with this drill up to 1/2”, and modern concrete (90’s) with the same bit type, the drill it’s just like a Hilti, same bits will work. The instructions on the case of Tapcons said to drill a hole in the concrete with a 5/32' bit. They both do essentially the same thing but are vastly different tools. The drill is in hammer mode the select switch mode is set and on setting 1, low speed to prevent over-heating of the bit. The best drill for concrete today is one of two tools: A hammer drill or a rotary hammer. In concrete, use a spline drive bosch bulldog hammer drill, never bother with a pilot hole as often have 8 or 12 walls to go thru, in deep holes, getting a. think plaster consistency, tough stuff in 3 of the four walls tested. There isn’t any aggregate in the wall that’s what is odd, it’s like a solid slurry of Portland cement. The bit still has the hammer flutes/blades and the are not chippedits new. The drill is not cordless, but I have had it for 30 years when I use to install Kawneer and Vistawall Curtain walls and skylights (commercially). The drill is in forward and in hammer mode, thank you -). I have tried other area's and in the foundation wall and got the same result. I can't get more than an 1/8" in about 15 minutes of incremental drilling with wax and cleaning. I have a Ramset Hammer drill with the Hammer drill option set, speed set at low, and a new 1/4" masonry/concrete bit. ![]()
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