Name the scale present in a screw gauge and how the readings are caliberated.
Answers
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The scale present in a screw gauge is called PITCH SCALE.
The pitch of the screw gauge can be determined by the distances travelled by the screw, divided by the total number of rotations. When the tip of the screw gauge is turned by one division of the head scale, the Least Count (LC) is taken.
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Explanation:
Screw Gauge is a mechanical tool which facilitates measuring diameter or radius or thickness of a thin wire or thickness of thin metal sheet with utmost accuracy. Figure1 shows the schematic of the Screw Gauge. This tool consists of mainly a U shaped frame and a spindle (or screw) attached to thimble. There are two scales known as Pitch Scale which is basically a main scale and is engraved on the barrel with vertical lines. Other one is Circular Scale which is engraved horizontally on the thimble. Pitch scale measures the distance in millimeter (mm) travelled by the spindle per revolution. One revolution by the circular scale is equal to the half of millimeter of displacement of the screw is called micrometer screw gauge. Micrometer gauges are more accurate and precise as compared to the Vernier Caliper scale.
HOW TO MEASURE IN SCREW GUAGE:
Measure in inches from the tip to where the screw head rests to get the length. Wherever the screw head would rest when it is fully embedded in something is where you start the measurement. Use a ruler or measuring tape to measure from here to the tip of the screw.[1]
For example, a countersunk screw with a flat head will rest flush with whatever it is embedded into, so start the measurement at the top of the screw head.[2]
For a countersunk screw with a rounded head, also called an oval countersunk, you start the measurement where the oval top and the countersunk half meet in the middle. In other words, where the oval top would rest on the surface.
To get the length of round-headed screws that aren’t countersunk, start measuring from the flat underside of the screw head.[3]
You can also use a template to measure the length of the screws.[4]
Measure the width of a thread in fractions of an inch to get the diameter. Use a ruler or measuring tape to measure from one side of a thread to the other using the nearest fraction of an inch. This diameter for screws in the imperial system is represented by either a gauge number or in fractions of an inch.[5]
A gauge number for screws in the imperial system corresponds to a certain fraction of an inch in diameter. To figure out the gauge number for a certain diameter, or vice versa, you have to look at a gauge guide to match up the "#" of the gauge with a fraction of an inch. You can find these guides online.
For example, a #0 gauge screw is 1/16 of an inch in diameter, #1 is 5/64 of an inch, a #2 is 3/32 of an inch, and so on
3
Count the number of threads in 1 inch to get the thread spacing value. Lay the screw next to a ruler or measuring tape and hold it steady. Count the number of threads in the space of an inch to get the thread spacing for screws in the imperial system.[6]
Thread counts in the imperial system generally range from 35-40 threads per inch.
The thread spacing is also called the thread pitch.[7
Tip: Screws sold with imperial system measurements on the packaging list the gauge first and the length next. They don’t usually list the threads per inch. For example, 10 x 2” means that the screw is a #10 gauge and is 2 inches long. If they include the thread count, it comes between the two numbers, like 10-35 x 2”