|Forum topic by PaulfromVictor||posted 03-16-2010 02:16 AM||1119 views||0 times favorited||6 replies|
03-16-2010 02:16 AM
Last week the weather finally broke, and I was able to put some poly on the drum sander frame I started a couple months ago.
Unfortunately, my kodak easyshare software is crashing my computer so I cannot provide any pictures for support.
This is a drum sander similar in design to Stewart’s and Autumns. The Drum is 5” diameter, 22” long on a 3/4” rod. 26” is the total width of the machine. It is waist high. The motor is a Baldor 2 hp 3450 rpm. I intended to decrease the rpms to 1750 with a 2:1 pulley ratio. The pulleys I ended up with are 4” on the drum, and 3’ on the motor. So, the speed is significantly higher than the planned 1750.
The problem I am having is with vibration. The motor itself is fine. When the belt is not attached, it purs like a kitten. When I attach the power twist belt to the hanging motor and to the drum, the whole thing vibrates like crazy. It skates across the floor. I have tried both shortening and lengthening the belt, and also adjusting the pulley in and out on the drum rod. Nothing seems to fix the vibration. I am confident that I have the belt correct side out, and rotating the correct direction (power twist belt has arrows indicating direction).
My only thought is maybe the drum is spinning too fast, but I don’t want to start buying pulleys as a guessing game. I already had the 4” pulley for the drum, but was not able to find a 2 inch pulley for the motor with a 7/8 inch arbor.