|Forum topic by JetDriver||posted 05-10-2016 03:23 PM||727 views||0 times favorited||26 replies|
05-10-2016 03:23 PM
So I’ve been making some DIY upgrades in the back yard over the last year and one of them about 6 months back was installing a small retaining wall of pressure treated 4×4’s. I bought a 5/8” auger bit that is 17.5” long over all to drill the holes for the spike that would connect and anchor the wall into the ground. I found drilling the first hole totally killed the battery on my old dewalt 14.4v drill so I walked across the street and borrowed a corded hammer drill (an old black and decker) from a neighbor.
The drill also really struggled to drill the holes and actually started smoking a couple of times as a result of the bit binding up.
Now to the heart of the story. My wife asks be to build some steps up to an upper area in our yard and having decided on pressure treated 6×6s I knew I would need a serious drill to bore the holes. I ended up purchasing a Bosch HD19-2 that was factory refurbished from CPO tools. The manual suggested high speed/low torque for wood and that is what I started with and once again the drill was really struggling. So I switched to low speed/high torque and now it was capable of fully burying all 17.5 inches of bit into the wood. The only problem was when I switched into reverse to back the bit out what happened instead was that the drill backed right off the chuck leaving it still attached to the wood. CPO was awesome and immediately sent me a replacement drill and shipping label to return the bad unit at no cost.
Drill number two and I start drilling its very first hole. I’m being much more cautious now and don’t run the bit in full depth before trying to back it out and the very first time I go into reverse it once again backs right off the chuck. I should mention that my old dewalt was able to back the bit out after a little help without ever spitting its chuck.
I finished my project using a combination of the two drills (Bosch in forward Dewalt in reverse) and once again CPO is sending me a replacement drill. I talked to Bosch tech support and the guy told me that the auger bit I was using was the problem and that unless I could drive it all the way through it was the wrong bit for the job. He suggested that what I needed was a their 11250VSR Rotary Hammer.
The more I think about it the more I’m thinking there is something off here. A drill should not make more torque in reverse than its capable of taking without having it come apart. And never in my life have I seen or had this happen before. So my question is… is the Bosch guy right? Should Auger bits only be used where you can drive all the way through? Or am I right and there is something night right with these drills?