On a miter saw, when you're cutting a 90 degree cut, the miter saw reads zero. On a protractor, it reads 90. So it's an unending source of confusion for people. RON HAZELTON: So Mark, show me how it works.
A ruler is used to measure units of length, inches, feet and yards. Standard rulers have inches on one side and centimeters on the other. A typical ruler measures up to 12 inches, and is equivalent to 30.48 centimeters. This is also equivalent to 1 foot. Each inch on a ruler has markings in between that are a fraction of an inch.
For all dimensions se corresponding reference letters in table. Angle between sides of thread is 60 degrees. Taper of thread on diameter is 3/4 inches per foot. Angle of taper with centerline is 1Â° 47' 24 (1.7899Â°). The basic maximum thread height, h of the truncated thread is 0.8 x (pitch of thread). The crest and root are truncated a minimum of 0.033 x (pitch) for all pitches.