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 diameter British thread?
Pitch diameter British thread calculator uses Pitch Diameter in British Associated Thread = Micrometer Reading British Association Thread-3.4829*Wire Diameter of British Associated Thread+1.13634*Screw Pitch British Associated Thread to calculate the Pitch Diameter in British Associated Thread, The Pitch diameter British thread formula is defined as the diameter where the thread thickness is equal to the space between the threads. Pitch Diameter in British Associated Thread is denoted by Db symbol.
How to calculate Pitch diameter British thread using this online calculator? To use this online calculator for Pitch diameter British thread, enter Micrometer Reading British Association Thread (Mb), Wire Diameter of British Associated Thread (Gb) & Screw Pitch British Associated Thread (Pba) and hit the calculate button. Here is how the Pitch diameter British thread calculation can be explained with given input values -> 7308.518 = 0.0082-3.4829*0.0013+1.13634*0.0032.