I'd like to talk about edge finders

[Highpower]

(04-18-2012, 03:33 AM)Bogstandard Wrote: 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.

I have to go along with this based on what I have experienced.
The scales on my mill DRO have a resolution of 0.0002" and I find that I can "tickle" a (good) edge finder between centered and off set, by getting the last digit in the display to flicker the last "0". So it may actually come close to taking only 0.0001" to offset the the edge finder.

I've done this using an audible edge finder while closely watching the last digit on the display. I can hear the finder just start to tick as the DRO digit begins to flutter.

I think the material can make a difference as well. Aluminum or brass seems to "grab" the edge finder sooner than Iron / steel. Seems to be that way to me anyway....