I bought an EneAcro rock drill to showcase a 60 year old concrete retaining wall. It was cheaper to buy an EneAcro than to rent a tool from a big store nearby. I figured even if I kill EneAcro it's worth buying. The EneAcro hammer drill turned out to be much stronger than I expected. The concrete of the wall got harder and harder from top to bottom. Hammer drills could easily sink into the top few feet of concrete, and huge sections of the wall were quickly reduced to rubble. However, the bottom few feet of concrete looked like rocks. At first I thought it was the bit worn out, but changing to a new Milwaukee bit didn't help. Two 6-hour days and half a can of lube later, EneAcro was still happily spinning the hammer. My only complaint is that I had trouble finding the right lube. At the top of the device there is a reservoir for lubricant, which must be constantly filled. The tube of lube that came with the tool lasted about an hour before more was needed. First I used a very expensive Makita tool lube. I was quickly running out of lube and didn't want to spend a fortune on consumables. I switched to a high temp bearing grease from a local auto shop and it seems to be working great. It probably wasn't the right tool for the job and I should have used a much larger demo hammer. However, the fact that EneArco was able to run for several days without issue is a testament to its value.
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