How much deflection of a v belt on a drill press is correct? My 1950's drill press is smooth and completely vibration free if I leave it loose, like as in 1.5" deflection... I set the ruler so the outer edge of the belt was at 3" exactly before I pressed on the belt. It has worked just fine for soft and hardwood and the brass doorknob job I posted about last week. I could tension it a lot more, but then it's louder. Still smooth and for the most part vibration free (the motor can vibrate a bit but it doesn't really translate much to the body or spindle), but makes a lot more noise. Bearings on the motor are tight and smooth. I figure light belt tension is good for this too, but what's the compromise? Belt slippage? Seizure? The way the motor is mounted and adjusted leaves for some play even if the belt is really tight, so the tighter the belt, the more those forces can come into play and make motion and noise. Also, my setup only goes to 610 rpm or so. For bigger cuts or metal, lower speeds seem to be recommended. That said, what's the issue if instead of a super low speed (seem lots of recommendations for 250rpm), I just reduced the duty cycle? That is, ensure the same number of cutting feet or contact rotations per minute as if working at 250, just shorter and lighter contact running at 610? What issues would I need to be concerned with? I'm not planning to cut with huge forstners or hole saws in metal, but for general knowledge, this would be helpful. I suppose a different pulley on the motor would always be viable - essentially just a ring around the shaft diameter to get maximum ratio. Thanks!