Archived from the Tools In Action forum (Power Tools). This thread is read-only.
I had to drill some 1/2 inch diameter, 4 inch deep, holes in concrete, I used my Ryobi 1/2 inch hammer drill. The chuck is a keyed Jacobs chuck. The bit had a step milled into the shaft. The drill runs like a champ, but the chuck kept comming loose, which required me to stop every few minutes and re-tighten it. That got old real quick. I thought it was the step in the bit so I ground it back so it wouldn’t interfere with the chuck jaws when it bottomed. Still lossened.
Is this just the nature of hammer drills? Or is there some other trick or tip I can use to keep it tight? I usually don’t drill 1/2 in dia holes, so I never had this problem before.
Thanks.
That is what is great about SDS bits, you don’t get this problem. You might just need a new chuck which is cheap and easy to install. After a lot of use and especially when a bit spins in the chuck, it tends to mess up the chuck or wear it down.
keyed chucks can be a pain but if you tighten all three sides rather than just one it will prevent it from loosening