I use rattling a fair amount. IME, it works best just before, during, and just aftre the rut. You also need a fairly high buck/doe ratio. There are as many different techniques as there are hunters, and most of them work.
First, set your self up so you can watch downwind. Most bucks will circle the noise and get the wind on their side. Don't sit in the open, use camoflage, or brush to break your outline. Some use cover scents, some don't. (I don't)
I start soft, just a little rubbing and scrapeing. I might do it for 20 to 30 seconds, then pause for a minute or two. Again, I rub and scrape, a bit louder. Keep an eye out for animals. After a while, maybe 10 to 15 minutes, I really slam the antlers together, and work them for maybe 30 to 40 seconds. Keep your eyes open and your rifle very closeby.
Most studies show that far more bucks are drawn to rattling than are actualy seen. Some put the bucks that are seen as low as 50%.
Don't rattle the same spots over and over, wait a few days between useing it. Bucks pattern humans just like we pattern them.