/diy/ - Do It Yourself

>>1533020
Stop telling people you can repeably measure more exact than 0.2mm with a caliper. (analog or digital)
Yes it shows higher resolution,
Yes it is advertised like this,
no this precision is not given due to the overall measurment concept of a caliper.
http://m.cmm-nano.com/info/the-abbe-principle-nano-metrology-19327204.html

When you're talking 0.02 (!!), the amount of heat from your hand will set the measurment off.
Ever wondered why micrometers have a plastic guard as a handle? To keep it from warming up by your hand.
Micrometers reach to about 0.02 and they have to be calibrated with nominal gauges to the given temperature and humidity.

Anything more precise than that can only be achieved with a CMM in a climated environment using statistical methods. (eg. determining a diameter with gauss-deviation, outscribed circle, inscribed circle, center of area-mass of the given contour or whatever you are looking for)

(skilled industrial mechanic and quality engineer in automotive)