Rook

What instrument do we use to calculate the diameter of rounded object?

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You need to provide more information (for this and your other thread) because it is not clear what you are asking

 

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Unless you can explain what you are after, people will not be able to help.

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Posted (edited)
14 minutes ago, Rook said:

what do we use to measure it? 

..the same what we use for not round objects? i.e. ruler.. ?

 

Edited by Sensei

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You can use calipers to measure (not calculate) a diameter

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2 hours ago, Rook said:

PLEASE  HELP...

thanks for any help.

Depending on precision and tolerances, anything from a simple pair of outside calipers, to a microscope and up to Vernier calipers for greatest precision.

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Posted (edited)

If its a regular rounded object like a sphere you just use simple math which you can find on the internet to find its measurements. If the object is round and not regular like an irregular blob of some sort, these days you use a 3D laser to measure its volume/surface...it has no diameter because its irregular.

Maybe you mean volume not diameter ?

Edited by koti

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Micrometer? (small scale caliper as mentioned above).

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These days there's a reasonable chance that I'd take a picture of the object and a ruler at the same time (and at the same distance) and then measure the distances on the screen.

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12 hours ago, Jothir said:
On 5/29/2019 at 11:02 PM, John Cuthber said:

These days there's a reasonable chance that I'd take a picture of the object and a ruler at the same time (and at the same distance) and then measure the distances on the screen.

How do u do that?

Using smartphone camera, and some kind of 2D painting application..

 

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13 minutes ago, Sensei said:

Using smartphone camera, and some kind of 2D painting application..

 

or taking the picture of the object next to a graticule?

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