Sorry, more like 0.000220" or 220 millionthsI would call the dial reading twenty one millionths.
YesWould it be correct to say that each graduation on the dial face is worth .00002” ?
No sorry, it would be +/- 0.0008". And nice indicator!Just to add another stick in the mud please notice that the “big numbers” on the dial face have a decimal point in front of each one
So this indicator has a total scale of +/- .8× .00002” ?
That is the number I came up with. Not too sure about the number, but dang sure I don't ever need to worry about hitting itSorry, more like 0.000220" or 220 millionths
Would it be correct to say that each graduation on the dial face is worth .00002” ?
Bob,220 millionths to machinists, who do not properly use the term hundred thousandths. It is not 2.2 ten thousandths, it is .22 ten thousandths, a goofy way to articulate it (for a machinist.) That is a wonderful old indicator, Federal was one of the best brands in those days. Federal made lots of special indicators for special uses by special customers. I have a couple myself...
Yes, 2.2 tenths would also be useful.You’re right that it is 220 millionths, but you misplaced a decimal somewhere in converting it to ten thousandths. 220 millionths is 22 one hundred thousandths or 2.2 ten thousandths or 0.22 thousandths or .00022". I may be wrong to refer to it as 2.2 “tenths”, but then I'll have to plead internet ignorance.