AC Variable Speed Controller, 120V~220V 15A 4000W SCR Voltage Controller for Router Fan Electric Motor Rheostat

I have two Westinghouse table fans from the 1950s. They move a lot of air but they tend to be a bit noisy. When I want a lot of moving air or I want white noise for a sleep, those fans are great. For TV I want much less airflow and much less noise. This controller works perfectly to slow the fan, reduce the air and cut the noise dramatically. I can use the ON/OFF switch without changing the speed setting and the fan returns to the preset speed from the night before. That's just what I wanted. The watt meter on the controller does not show what wattage of this fan. I don't know why and I really don't care. The controller does what I want it to do.

I had some issues getting this working, the way I wanted it to. But working with the manufacturer I was satisfied with the solutions they provided.

I suppose that just purchasing a variable speed bench grinder in the first place is the better option. However, since mine is set up with the wheels I want and mounted with appropriate measurements for woodturning tools I sharpen, this speed controller is a good addition. At about half the dial the voltage gets so low that the grinder shuts off, but about mid range the RPM is slowed enough for sharpening and reduction of the heat build-up for my tools. Cheaper options for a controller just don't work at all.

This didn’t even work when I got it , switched did turn it off and the dial never adjusted, it was hooked to a 110 fan in my shop 20”fan

Got this and was surprised at how lightweight it is. Weight-wise, it feels like the controller is empty, and feels like it was made very cheaply. Was skeptical, but plugged it in to run a large shop fan. This fan has 2 speeds - tropical force and hurricane force winds! Works well for outside and a large shop, but we wanted to use it indoors when doing repairs around the house as well. Hooked this controller up, and it definitely slows the fan speed down. The fan doesn't even start to work until the dial on the controller is at about 60% (less than that the fan does nothing), and goes up from there. When using the controller the fan speed never gets to full speed, even at 100%. Not a problem because if we want the fan to run at full speed, we just unplug the controller, and use the fan as-is. We wish the speed control was better at controlling the fan between 0-100%, but at least it does make the fan usable indoors, whereas it wasn't before. With the build quality, I'm not really sure how long it will last, but time will tell.