{"id":936,"date":"2023-05-08T12:10:00","date_gmt":"2023-05-08T06:40:00","guid":{"rendered":"http:\/\/physicscatalyst.com\/article\/?p=936"},"modified":"2023-05-09T00:29:41","modified_gmt":"2023-05-08T18:59:41","slug":"practical-screw-gauge","status":"publish","type":"post","link":"https:\/\/physicscatalyst.com\/article\/practical-screw-gauge\/","title":{"rendered":"Screw Gauge physics experiment"},"content":{"rendered":"\n

Introduction<\/h2>\n\n\n\n
\"Screw<\/a><\/figure>\n\n\n\n

A screw pitch gauge is a precision instrument. It is used for measuring the diameter of circular objects mostly wires, with an accuracy of 0.001cm. It consists of a hollow cylinder mounted on a U frame. The hollow cylinder leads to a ratchet which is meant for fine adjustment. The U frame consists of a flat end known as a stud and a screw on the other side. This screw can be moved inside the nut by fitting in the U frame by rotating the hollow cylinder called the thimble. This is called the main scale. The hollow cylinder or the thimble is graduated into 50 or 100 equal parts. This is called the circular scale.<\/p>\n\n\n\n

Principle of Screw Gauge<\/h2>\n\n\n\n

1)The screw gauge works on the principle of the screw.
2) When we rotate the head \u2018H\u2019 by means of safety device \u2018D\u2019 through one complete rotation, the distance moved by the screw for every complete rotation is constant.
3) This constant distance moved by the screw for one complete rotation of head \u2018 H \u2018 is called the Pitch of the screw<\/strong>.
4) If the head scale has 100 equal divisions, then the distance moved by the screw for even 1\/100 of a complete rotation can be measured accurately, this is called the Least count of the screw gauge<\/strong>.<\/p>\n\n\n\n

Least count=Pitch\/No of division on the circular scale<\/p>\n\n\n\n

How to use Screw Gauge<\/h2>\n\n\n\n

Let’s take the example of Determination of Diameter of a Wire
The wire whose thickness is to be determined is placed between the anvil and spindle end, the thimble is rotated till the wire is firmly held between the anvil and the spindle. The rachet is provided to avoid excessive pressure on the wire. It prevents the spindle from further movement.
Reading = Linear scale reading + (Coinciding circular scale x Least count)<\/p>\n\n\n\n

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Example
\nLinear scale reading = 1mm or 0.1cm<\/p>\n

Circular scale reading = 26, so 26 x 0.001 = 0.026cm<\/p>\n

So observed reading = 0.1 + 0.026 = 0.126cm<\/p>\n

<\/p><\/div>\n\n\n\n

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