3 ms·
Lots of perfectly functional SDS hammer drills are electric (here in USA they're 120V). This is different from what I've called an impact driver, which is more
by jessaustin 5y ago
Lots of perfectly functional SDS hammer drills are electric (here in USA they're 120V). This is different from what I've called an impact driver, which is more for turning fasteners than drilling holes. Even Harbor Freight sells a few electric hammer drills that will sink smaller diameters like 1/4" at about 2 seconds per inch. Larger diameter bits take longer, but there's no need for an air compressor.
I'm not sure why you'd mention "reinforced" concrete. I thought all concrete required reinforcement of some sort? Fiber won't be an issue, but if you hit rebar it's time to relocate your hole, no matter what you're drilling with. Even if the drill can do it you're going to ruin the bit.
- bayindirh 5y ago> I'm not sure why you'd mention "reinforced" concrete. I thought all concrete required reinforcement of some sort? Concrete can be tuned for brittleness and strength. Some versions become very hard and impenetrable after they completely cure. They need more powerful drills and longer drill times since they simply resist the drill bit. It's akin to the difference between stainless steel and armor plate.
- jessaustin 5y agoOh I see; this may be similar to something we see sometimes with some very old concrete. Still, it isn't clear why this would be used in a residential setting.
- bayindirh 5y agoConsider a gated community built very close to sea, where the houses are exposed to salty moisture all year long. Moreover the area is rocky, and is a very active earthquake area, so that a double wall sub basement/foundation is required. On top of that, the gated community is built by a company which is building dams regularly, so they're knowledgeable in specialty concrete mixes for both quake and moisture resistance. [This is not a hypothetical scenario btw. :) ]