I've been using a 9" diamond blade to dry cut 50mm blocks. It was only a ten quid cheapie, but it's been doing a good job. Quite suddenly, it started to have poor cutting performance along with lots of sparks. There's plenty of diamond left, so I'm not sure why it would stop cutting properly?????
Poor performance? Lots of sparks? You're out of blade, Billie. You might think there are lots of diamonds left, but the diamond coating on those cheaper blades is pretty thin and soon wears away. Time for a new blade. methinks.
Oh well, I've had my ten quids worth; cut over a hundred blocks. I did hear from somebody who knows very little more than me, that these things could be dressed/sharpened by cutting some sandstone or tarmac? Thanks for the info.