04-18-2012, 03:33 AM
You are all jumping to the conclusion that it is thous between centred and off centre, when in fact, most edge finders, like the Starrett, comes off centre when it moves approximately 2/10ths (0.0002").
So in reality, it can be ignored.
Now where a lot of people go wrong is that they don't treat their edge finder as a precision instrument, which it is, and drop it anywhere that is available and never really look after it. Even using the wrong lubrication can cause it to mis-read.
If you suspect your edge finder isn't being too accurate, clean it off in some spirits and re-lube it with either watch or sewing machine oil, NOT the usual suspects, WD40 or 3 in 1 (they contain certain ingredients that gum everything up), and do it very liberally, one tiny spot on the sliding faces is plenty, and don't go pulling at the internal spring, just gently lift the sliding edges apart, enough to pop the oil in there. It should then work like a brand new one, like mine, and that is well over 20 years old.
John
So in reality, it can be ignored.
Now where a lot of people go wrong is that they don't treat their edge finder as a precision instrument, which it is, and drop it anywhere that is available and never really look after it. Even using the wrong lubrication can cause it to mis-read.
If you suspect your edge finder isn't being too accurate, clean it off in some spirits and re-lube it with either watch or sewing machine oil, NOT the usual suspects, WD40 or 3 in 1 (they contain certain ingredients that gum everything up), and do it very liberally, one tiny spot on the sliding faces is plenty, and don't go pulling at the internal spring, just gently lift the sliding edges apart, enough to pop the oil in there. It should then work like a brand new one, like mine, and that is well over 20 years old.
John