On Aug 14, 10:32 pm, "Terry Coombs" wrote:
wrote:
On Aug 14, 1:55 pm, "BillM" wrote:
The recent thread on edge finders got me
wondering.

I'm of the 'Spin it at 1000 or so, bring it
slowly to the edge and watch for the "jump""
school.
I have two edge finders, .500 and .200 diameter.
All other things being equal, which is
more accurate in finding an edge? The jump on
the .200 is harder to see, but it almost
seems more consistent.

I favor the .200" size but not for accuracy (which I have not compared
between it and the .500)

It's just easier, in my mind, to add .100" to the 'step off'
dimension, rather than .250".

Having said that, I used the .500" one for about 40 years before I
even saw a .200" one.

Lewis.

*****

The screws in my mill are 8 tpi . Easier for me to use the .500 , cuz it's
zackly two turns of the wheel to center .
--
Snag
wannabe machinist


I like the .200" dia. edge finder because my feed screws are .200" per
turn and 1/2 turn gets me to the spindle center line :-)).

Here is a question: Has somebody here actually TESTED an edgefinder
to determine accuracy and repeatability?

Never got to check it myself because the results were usually
workable, but it would be nice to know.

Wolfgang