My micrometer reads out to ten-thousandths of an inch.EX: .2501".This is 250 thousandths plus 1-ten thousandths of an inch.I never guesstimate a reading...Hope this helps
Three places
First calibrate the micrometer by dialing the spindle to zero and adjusting the anvil until it is flush against the spindle. Measure the screw until the ratchet begins to click and take the first reading. This reading can then be compared to a machining book to verify the pitch diameter.
The number is already in decimal form so why would you want to estimate it in decimal form???
A micrometer is equal to exactly 1 micrometer.
100 micrometer. = .1 millimeter = .0001 meter.
A digital micrometer is the easiest to read as it displays the exact reading on a screen.
When reading a small-hole gauge, the micrometer reading is taken at the point where the split in the ball aligns horizontally at 90 degrees. This allows for an accurate measurement of the diameter of the hole based on where the micrometer lines up with the scale on the gauge.
Three places
All you need to do is make contact. Tightening will give you a false reading and eventually damage the micrometer.
the spindle must be tighten to avoid slightly changes on the reading
That would be .65, as in "The micrometer reads 0.65 on the dial."
First calibrate the micrometer by dialing the spindle to zero and adjusting the anvil until it is flush against the spindle. Measure the screw until the ratchet begins to click and take the first reading. This reading can then be compared to a machining book to verify the pitch diameter.
A micrometer is commonly used to accurately measure to two decimal places in millimeters. It is a precision measuring instrument that provides a more detailed and precise measurement than a typical ruler or caliper.
The maximum reading of a micrometer screw gauge depends on the number of divisions on the thimble and the barrel. Typically, it can measure up to 25 millimeters with a resolution of 0.01 mm on the main scale and an additional fraction of a millimeter based on the thimble divisions.
Difficult to explain without diagrams, but the micrometer relies on an accurate screw which advances the caliper a precise amount with each revolution. So you turn the screw until the object is lightly held, then read the axial scale and add on for the number of screw turns above the nearest scale reading. The most accurate type also have a vernier scale for very small distances. I suggest you look at Wikipedia 'Micrometer' which has a thorough explanation with diagrams.
The number is already in decimal form so why would you want to estimate it in decimal form???
When using a small hole gauge, the micrometer is taken perpendicular to the split in the ball. The split should be aligned at 90 degrees to the micrometer in order to accurately measure the diameter of the hole being checked.