I was trying to cut some paving slabs at the weekend. I was using a diamond blade and it was heavy going. I thought at first that the slabs were just very tough.
I looked at the blade and there was plenty of diamond left but the diamond patches had a hint of brown. I read here that if the blade overheats it will turn a brown colour and that the glue can soften and the diamonds sink beneath the surface.
Could this be what happened? It was a cheap silverline disc from toolstation. I had an equally cheap disc from aldi that I put on instead and it cut like a knife through butter, so it was the blade, not a tough slab.
Isn't there a trick to rejuvenate worn blades? Do I have to cut a couple of bricks? Or should I just bin it?
How is the best way to prevent overheating? I would think that if you keep lifting the blade out to allow it to cool, this will make cutting a straight line quite difficult to achieve? Surely it is best to leave the blade in the slab. Is the trick to keep the blade in the slab but let it move at its own pace rather than force it?