Bill Stephenson
05-26-2012, 6:07 PM
I thought I would post this for others who may have the same issue. My Unisaw is 7 years old and has required little attention. Feeling that it's about time to do some preventative maintenance I removed the side cover cleaned out the sawdust inspected the trunions and tilts. Everything checked out good and I tightened the belts. When I started the saw it started with a loud bang but ran fine. I then took the blade off and ran the saw & it started normally (quiet). I put the blade back on and again I had the "bang " on start up. I then thought it was the law of physics ( body at rest tends to stay at rest etc.) I then addressed the only variable I introduced tightening the belts, so I proceeded to loosen the belt and the "bang " became diminished. I then loosened the belts to what I would call "very loose" and started the saw. It started without any "bang" noise and was quiet and smooth. Thinking the belts now may slip I ripped some 4/4 oak and I could see no slippage. I believe loosening the belts allowed for some "give" during startup eliminating the jolting Bang. Hope this may help someone as it took me a few days to figure this out.