Declaring Python variables. There are two phases of creating a variable: 1  First, you need to initialize a variable by creating a container and assign it a name. 2  This is called initialization. 3  Second, you assign value to the the variable. 4  This is known as assignment.
Cylindricity-Cylindricity describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis. Symbol: . Cylindricity controls a cylindricals features element such that the total variations are minimized during manufacturing.
The perpendicularity would be the distance between 2 perpencdicular planes that would extend for the diameter of the part. You would have to convert the angle of the end surface to see what that spacing would be for the extent of the diameter. This is how it works in theory.E: Perpendicularity Callout. The perpendicularity callout is a zone tolerance of the perpendicularity of the flange on the tube to the axis of Datum A. You take the basic location of the flange and project a line 1/2 the callout window one direction and 1/2 the other and that is your target window for the OD.