Here's the deal. I just purchased a new carving bit from Amazon. I started a 2 hour project - it finished successfully, but the bit was lose in the chuck. It was quite stuck though. The chuck would not go up. After playing with it for quite some time, I was able to get the bit out. After I got it out, the bit adapter had several bb's marks around it.
The chuck was dirty, so I cleaned it out pretty good with WD-40. Let it snap back into place several times, etc. Once I thought it was pretty clean, I tried to put the bit back in and the chuck just didn't want to drop back into place - took quite a while, but I got it.
Started another project (about 4 hours - double sided). Half way through it, I inspected the bit and it was very lose again. After much trial, I was able to pull the bit out again and it had twice as many bb marks in it. Sprayed another half can of WD-40 into the chuck, cleaned it out as much as possible and put a cutting bit back in just to see how tight it was - it was also lose. Every bit I have tried in the chuck was lose. Some have never been used.
It's carving the other side, but it's noticeably noisier. The bit just isn't sitting in the chuck tight.
I know the dirt can cause the chuck to not move up and down correctly, but once it's down, shouldn't the bits be tight (whether they have bb marks or not)?