What is the use of Three wire method ?
The accurate measurement of thread pitch diameter, which may be perfect as to form and lead, presents certain difficulties which result in some uncertainty as to its true value. The adoption of a standard uniform practice in making such measurements is, therefore, desirable in order to reduce such uncertainty of measurement to a minimum. The “three – wire method” of measuring thread pitch diameter, has been found to be the most generally satisfactory method when properly carried out, and is recommended for universal use in the direct measurement of thread plug and thread setting plug gauges.
How to Calculate Pitch of Screw Threads?
Pitch of Screw Threads calculator uses Screw Pitch of Unified Nation Thread = (Pitch Diameter of Unified Nation Thread-Micrometer Reading Unified and National Thread+3*Wire Diameter of Unified Nation Thread)/0.86603 to calculate the Screw Pitch of Unified Nation Thread, The Pitch of Screw Threads formula is defined as the distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis of the thread. It is represented by the letter p. (p=1/n). Screw Pitch of Unified Nation Thread is denoted by Pun symbol.
How to calculate Pitch of Screw Threads using this online calculator? To use this online calculator for Pitch of Screw Threads, enter Pitch Diameter of Unified Nation Thread (Dun), Micrometer Reading Unified and National Thread (Mun) & Wire Diameter of Unified Nation Thread (Gun) and hit the calculate button. Here is how the Pitch of Screw Threads calculation can be explained with given input values -> 2959.482 = (0.00698-0.00827+3*0.00128)/0.86603.