Why not add a 'level arm' - magnify the change easily.

"With a level I can move the world" in reverse.

Martin

On 12/29/2016 12:19 PM, wrote:
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