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Micrometer readings

Completely forgotten, how do you get a reading from a micrometer???
Reply 1
Avatar for Mohit_C
Mohit_C
10
The readings on the barrel go from 0-50. When you place the claws of the micrometer between say a wire, you should see the divisions. If you see the first line on the top (half way one) it means whatever reading you got on the barrel you add 50 and it's 0.(50+whatever). If you see the first division, that is 1 mm.

This is rather complicated and difficult to explain by words; you'll need to have one in front of you and something to measure.
Reply 2
Avatar for dh00001
dh00001
16
try looking here its kinda hard to explain though
Reply 3
Avatar for Method
Method
12
SOURCE: Wikipedia:

Reading a metric micrometer

Micrometer thimble reading 5.78mmThe spindle of an ordinary metric micrometer has 2 threads per millimetre, and thus one complete revolution moves the spindle through a distance of 0.5 millimetre. The longitudinal line on the frame is graduated with 1 millimetre divisions and 0.5 millimetre subdivisions. The thimble has 50 graduations, each being 0.01 millimetre (one-hundredth of a millimetre). To read a metric micrometer, note the number of millimetre divisions visible on the scale of the sleeve, and add the total to the particular division on the thimble which coincides with the axial line on the sleeve.

Suppose that the thimble were screwed out so that graduation 5, and one additional 0.5 subdivision were visible (as shown in the image), and that graduation 28 on the thimble coincided with the axial line on the sleeve. The reading then would be 5.00 +0.5 +0.28 = 5.78 mm.

Micrometer thimble reading 5.78mm:



Enjoy! :smile:
Reply 4
Avatar for Mohit_C
Mohit_C
10
Just a quick question, is the estimated uncertainty of this micrometer 0.5*0.01mm = 0.005mm?
Reply 5
Avatar for Al-farhan
Al-farhan
20
use this link for a good explanation of its use:
http://www.upscale.utoronto.ca/PVB/Harrison/Micrometer/Micrometer.html
Reply 6
Avatar for Livethefire
Livethefire
Mohit_C
Just a quick question, is the estimated uncertainty of this micrometer 0.5*0.01mm = 0.005mm?


Me and F1 were talking about this kind of stuff in another thread.
If you were asked to calculate it: that would be deemed aceptable.

However for most micrometers sources would say its 0.001mm

This is because the zero reading also has an uncertainity.
So what you have calculated is the uncertainity in one of the two readings:

so

0.005 + 0.005 = 0.01mm

To be honest Ive relised all this type of thing is very subjective anyway.

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