I've been using 4 1'/2" grinders for about 30 or 40 years. I'm 72 years old. I've always had 10,000 rpm single speed and used 5" discs with it. Mostly i build small boats and use them to shape wood but sometimes metal or concrete. i always thought variable speed would be nice but i have also had porter cable vs 6 grinders for years. i finally threw the money on this makita and it's flat I love it, I often use slower speeds and I'm much less likely to dig further into the woods than I'd like so I use it where I previously could have used a 6" grinder because it's faster and I don't have to worry so much about damaging the work.
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