inairam wrote:In a contuned effort to reduce the vibration this weekend I took off the blands again and weighed them with a digital fish scale before and after sharpening. There was little or no change using the ounces setting.
The fish scale also has a tape and using mm they are the same length.
One blade was 63 oz and one was 59 oz. Is this too much of a difference? I happen to have a long hook for the battery box close by and that is about 4 oz. +/- 2 oz on an average 61 oz is +/- 3.3% with a total of 6.6% difference.
You don’t have access to a postal scale, do you? I sure would prefer to have them match to 0.1 oz. that’s probably way more precision than necessary, but as long as you’re balancing it…
The distance from the center of gravity of the blade to the center of rotation also plays a role, so it matters where you take the material off as well.
I picked up a cheap garage sale lawnmower a while back. It had a badly out of balance blade on it. It had vibrated so badly that it busted out all of the mounting bolts holding the engine to the body and cracked the carburetor mounting plate in half from fatigue. How long must they have tolerated it shaking that badly to cause so much damage? (The engine still runs strong and starts easy, though, so it was worth it to me.)
