Measuring Miniature Parts Information
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This information sheet is intended to offer an insight into some common errors encountered when measuring miniature bearings or other miniature parts.
The most prevalent cause of incorrect measurements comes from the use of digital verniers. Digital verniers can lose their precision very quickly with rough handling or fast movements of the slider. Digital verniers need to be calibrated regularly, checked before a measurement is taken, and moved slowly into position against the object being measured.
Verniers Have Flat Measuring Bar. This is something people rarely take into account when
measuring the inside diameter of round miniature parts. The measuring bar on verniers has a very small flat on it – it is never razor sharp. When you place a flat object against the inside of a curved object you get a small gap between the objects. The width of the flat is not very large, usually around 0.2 to 0.3mm, but when you are measuring the inside of a 4mm diameter bearing 0.2mm flat is quite a lot. It is a little like trying to get an accurate measurement of a 200mm diameter bearing using verniers with a 10mm wide measuring bar.
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