Archive for the 'Concrete Grinder' Category
By Andrew McLeay
Do you realize that thin coatings on hard concrete can be the most difficult to remove? Did you know that most epoxies contain fine powdered sands and are not always difficult to grind?
Diamond grit size for coatings:
In general, coarse diamonds will cut through coatings better than fine diamond segments which tend to clog up with the coating material. There should be enough bite in the size of the diamond to penetrate the coating and score it, so a 30/40 grit is recommended. For thicker coatings, grits of down to 10 can be used successfully.
If the diamond disc is removing the coating productively then keep using it, but if it slows down you need to look at two things.
1. Perhaps the concrete is too hard and the diamonds are blunting which means you need to choose the same grit cupwheel in a softer bond. For more details see Segments – hard or soft.
2. Or maybe the coating is too thick (say over 500 microns) so you need to change to a scraper disc which will tear it off rather than grind it off. These PCD discs have small blocks of diamond. Read the rest of this entry »