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???
100 micrometer. = .1 millimeter = .0001 meter.
A micrometer is equal to exactly 1 micrometer.
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."
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.
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???
To read a micrometer, first look at the main scale reading plus the number of revolutions on the thimble scale. Add the main scale reading to the thimble scale reading and the additional value from the vernier scale if your micrometer has one. The final value is your measurement in millimeters or inches, depending on the micrometer.
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.
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.