Lately, my Delta has been "knocking" intermittently.
It sounded like it was coming from the bottom hold but couldn't be sure.
Today I was cutting a larger than normal piece and the knocking got more intense so I stopped.
I took apart the machine, trying to remember what I did last time I took it apart. Got it all down except for the top electrical switches.
Moved the parts around, up/down and could not figure out where the sound was coming from.
So, I put it back together hoping I would not have left over pieces like last time.
Turned it on, leveled and started to cut a piece and no more sound
The top arm is much stiffer than it was, so not sure if that could have been the problem. Perhaps the screws etc. just needed tightening?
I have no idea what I did, but it seems to have stopped the "knocking" and worked.
Just thought I'd share in case someone else with this saw experienced something similar.