Question

Zero error of a 50-75 mm outside micrometer can be checked with

Answer 1

The zero reading (minimum range) of the outside micrometre while measuring with a 50 mm to 75 mm micrometre is 50 mm.

• When the spindle and anvil of micrometre screw gauge are made to touch each other, then, the zero on the main scale should match with a zero on the circular scale.
• However due to wear and tear or manufacturing defect the two zeros usually do not coincide with each other, then the vernier is said to have zero error.
• There are 2 types of zero errors.
• Positive zero error occurs when the ‘0’ marking of the thimble scale is below the horizontal reference line of the main scale.  
• Negative zero error occurs when the ‘0’ marking of the thimble scale is below the horizontal reference line of the main scale.  

Answer 2

व्हाट इज द रेटिंग ऑफ द आउटसाइड माइक्रोमीटर 5275