Measurement of Screw Threads Parameters using Two Wire or Three-Wire Methods

First click on 'Two-wire' under 'Experiment Parts'. Select 0.722 (standard diameter of wire) mm as the value of wire diameter d from the given dropdown. The value of pitch of thread p is 1.25 mm.

Click on the one wire for two times to place the two wires on the measuring faces of micrometer spindle and anvil.

Click on the screw thread specimen to place it in between the two wires on the measuring faces of micrometer spindle and anvil. Click on the clockwise arrow sign on the 'Rotate Micrometer' button. Wait until the circular scale of the micrometer stops rotating. Again click on the same arrow key . Click it until the screw thread is properly fixed between the wires. After a ratchet wrench sound, one alert message will be shown when it is properly fixed.

Click on 'Calculate' button to find out the value of the effective diameter (E (mm)). Click on the anticlockwise arrow sign on the 'Rotate Micrometer' button to move the micrometer spindle from fixed position.

Click on the screw thread specimen to place it back to its previous position. Click on 'Clear' button. Follow steps 2-4 by selecting 0.866 mm as the value of wire diameter d from the given dropdown. The value of pitch of thread p is 1.5 mm.

Now click on 'Three-wire' under 'Experiment Parts'. Select 0.722 mm as the value of wire diameter d from the given dropdown. The value of pitch of thread p is 1.25 mm.

Click on the one wire and two wire to place them on the measuring faces of micrometer spindle and anvil.

Follow steps 3-4 to measure the effective diameter (E (mm)), the distance between the outer surfaces of the two wires M (mm) and the value of H (height of the threads in mm).

Click on the screw thread specimen to place it back to its previous position. Click on 'Clear' button. Follow steps 8-10 by selecting 0.866 mm as the value of wire diameter d from the given dropdown. The value of pitch of thread p is 1.5 mm. Click on 'Clear' button.