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 Unified national threads?
Pitch diameter Unified national threads calculator uses Pitch Diameter = Micrometer Reading-3*Wire Diameter+0.86603*Screw Pitch to calculate the Pitch Diameter, Pitch Diameter Unified National Threads formula refers to the diameter of an imaginary cylinder that would encompass the tops of the threads (crests) in an external thread or the bottoms of the threads (roots) in an internal thread. This measurement is crucial because it represents the effective size where the male and female threads engage to provide proper fit and functionality in mechanical assemblies. Pitch Diameter is denoted by D symbol.
How to calculate Pitch diameter Unified national threads using this online calculator? To use this online calculator for Pitch diameter Unified national threads, enter Micrometer Reading (M), Wire Diameter (G) & Screw Pitch (P) and hit the calculate button. Here is how the Pitch diameter Unified national threads calculation can be explained with given input values -> 7198.09 = 0.0082-3*0.0012+0.86603*0.003.