Micrometer screw gauge + Vernier capiliers

Question 1

How to read micrometer reading

Answer 1

Reading = main scale + thimble scale

Main scale top is in mm, bottom in .5mm thimble scale in .1mm

Question 2

Zero error for micrometer

Answer 2

If 0 line in thimble scale corresponds w 0 line in main scale - no error
(when micrometer is closed)

Question 3

Anatomy of micrometer

Answer 3

Resolution 0.01mm
Main scale (sleeve)
Thimble - rotating scale
Spindle and anvil clamped around whatever you’re measuring, tight enough so it doesn’t fall off but not too tight that it deforms object.
Never tighten with barrel, tighten with ratchet - reduces chance of overtightening and leading to zero errors

C frame the c shaped thing
ALWAYS QUOTE READINGS TO 0.01 MM DUE TO RESOLUTION AKEKE

Question 4

What is a micrometer gauge used for

Answer 4

Measuring small widths,thicknesses or diameters

Question 5

What is a Vernier Caliper used for

Answer 5

Can be used to measure diameters and thickness like micrometer, but can also measure lengths e.g. of a screw or depth of a hole

Question 6

Reading off vernier caliper

Answer 6

Ream main scale (mm) then identify where vernier scale aligns w main scale. Common error to read from edge of vernier scale rather than zero mark

Question 7

Polythene load/unloading graph

Answer 7

Loads like a rubber then unloads as straight line down. Unloading with greater change in