Just got it put together yesterday. Double checked everything before starting it. Motor sounds like metal on metal for about 1-2 seconds before going nice and quiet and smooth running.
I've used table saws from cheapo $50 ones up to the big production 5 HP monster powermatics at our shop. Some of them make a little more racket at start but not this much. I've checked and checked short of cracking the motor housing open. Like I said, after a second or two it runs with that nice hum that a good saw should.
Before I worry about it, is it normal for the 3650? I really really don't want to take it back apart and box it up in a few days due to a crapped out motor.