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 whitworth?
Pitch diameter whitworth calculator uses Pitch Diameter = Micrometer Reading-3.16568*Wire Diameter+0.96049*Screw Pitch to calculate the Pitch Diameter, The Pitch Diameter Whitworth formula is defined as the diameter of an imaginary cylinder that intersects the thread profile at the point where the width of the threads and the width of the spaces between the threads are equal. This measurement is fundamental for determining the effective size of the thread where proper engagement and functional fit occur. Pitch Diameter is denoted by D symbol.
How to calculate Pitch diameter whitworth using this online calculator? To use this online calculator for Pitch diameter whitworth, enter Micrometer Reading (M), Wire Diameter (G) & Screw Pitch (P) and hit the calculate button. Here is how the Pitch diameter whitworth calculation can be explained with given input values -> 7282.654 = 0.0082-3.16568*0.0012+0.96049*0.003.