wrote in message
...
So I was looking at some rotary encoders and a thought occurred to
me
that maybe I could make a level with a digital display for checking
lathe bed twist. The highest number of pulses per revolution
available
was 40,000. That works out to only .009 degrees. Seems pretty
small
huh? But .009 degrees is 36 seconds! That works out to .0016" in 10
inches. My fairly inexpensive precision level shows .0005" in ten
inches. That's ten seconds resolution. And I know it's accurate
'cause I checked it with gauge blocks. I know, overkill, a feeler
gauge would be good enough. I guess I'll stick with the level and
just
watch the analog bubble display.
Eric

http://arstechnica.com/information-t...led-the-waves/
"But take away the fancy GPS shells, and the AGS and its digital fire
control system are no more accurate than mechanical analog technology
that is nearly a century old."

--jsw