Cutting marble tile w/ an angle grinder
I'd have to guess that you may have installed it incorrectly, or failed to figure out what "correctly" is for your particular grinder/blade combination. I cut a lot of tile with a dry diamond blade on a grinder, and I do recall that the setup for the thin diamond blade was different than for a standard thick grinder blade, though I can't recall how it was different without the thing in front of me.