A Thread angle of a given screw thread can be determined by using Tool Maker's microscope. The microscope gives an enlarged view of the thread profile. In Tool Maker's microscope an illuminating unit is provided below a measuring table. This illuminating unit will focus the edge profile or contour shape of the thread. By getting the contour shape we can find the thread angle.
The Tool Maker's microscope is provided with a cross mark(x) on its primary eye piece. In this cross line, we have to adjust one line to one flank surface as it is aligning to it. In this position we should take the protractor disc reading as initial reading. Then after we should rotate the protractor as the same line of cross mark aligns with the opposite flank surface. In this second position again we should take the protractor reading as final reading. The difference between the two readings will be the desired angle value.
The Tool Maker's microscope is provided with a cross mark(x) on its primary eye piece. In this cross line, we have to adjust one line to one flank surface as it is aligning to it. In this position we should take the protractor disc reading as initial reading. Then after we should rotate the protractor as the same line of cross mark aligns with the opposite flank surface. In this second position again we should take the protractor reading as final reading. The difference between the two readings will be the desired angle value.
Tool Maker's Microscope
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