Groove Geometry Calculation 
Given the groove internal angle and depth, and the tube diameter and target span angle, this page presents a method of calculation to determine the central angle for each groove and the number of grooves required to completely cover the target area.
In Fig 1 the tube surface (before grooving) and the groove are shown in red, and the center of the tube (coincident with the focus) is shown in green. Once the groove halfwidth, w, has been determined, it can be used in conjunction with the tube radius, r, to determine the central angle for a groove. The number of grooves required can then be determined by dividing the target span angle by the groove central angle. The following C program performs these calculations and displays the input parameter values and the calculated results:
Download executable MSDOS version
