I have a Wixey angle guage and a Craftsman 12” digital level. I decided to discover just how accurate 0.1 degree is.
I put the Wixey on top of the Craftsman and zeroed both while sitting on my table saw. By inserting a feeler guage under one end of the Craftsman level I could determine how many thousandths of an inch it takes to go from 0.0 to 0.1 degrees.
My finding; 0.010”. At 0.011” both guages changed from 0.0 to 0.1 degrees.
0.010” per foot
This can be further proven mathematically.
((12 X 3.14159265)/360)/10= 0.0104719755 or rounded to 0.010
For those that might be confused I’ll explain the formula.
12 is the number of inches in one foot
3.14159265 is the ratio of any circle’s circumference to its diameter
360 is the number of degrees in a circle
10 is to divide each of those degrees by ten to get 0.1 degrree.
The question then, for each of us Lumberjocks, is, ” Is ten thousandths of an inch in a foot close enough?”
For me it is.
-- Gen 8:22 While the earth remaineth, seedtime and harvest, and cold and heat, and summer and winter, and day and night shall not cease.