Hi all,
This has been bothering me for years now, but my blade on my table saw is rubbing, grinding, vibrating (idk) somewhere / somehow against my zero clearance insert. The sound disappears as soon as I take the ZCI off, but as soon as I put it on it comes back. Basically it sounds like the blades is scraping the ZCI, but I can't visually see any traces of that happening. The ZCI fits well and the saw has minimal vibration so I don't think that it's the ZCI itself vibrating. I've fully raised and lowered the blade many times while the saw was running thinking that maybe the blade had a slight wobble and would cut a new groove, but that didn't help either.

The saw is a old Craftsman 113.

You guys have any ideas? Its driving me nuts.

Thanks Michael