I bought a 4-1/2" angle grinder from Harbor Freight, I don't have much grinding to do so I just wanted to get a cheap one and use it for this project which requires grinding off a few door hinges that has been set into metal door jambs that extended into the slab. The grinder came with metal disc but I also need to make some cuts in concrete so I went and got a
4-1/2" diamond blade from the big box store only to find that those discs do not fit...apparently the metal grinding disc that came with it has a depressed center so that the locking nut can be secured from the outside. If I put in a flat disc there is not enough room for the lock to catch - well even if there was I am not sure it's a good idea as the lock may break the thin disc.I have never used this type of grinder before does it mean I need a special depressed center diamond cutting blade or do I need a special fitting to use standard blades?
Thanks,
MC