ISO viscosity flow cups by evenlu

Last crawled date: 3 years ago

I needed a set of visocity meters and found drawings with rough dimensions online for different types. This collection is for ISO 9431 standard cups in dimensions 3, 4, 6 and 8 mm.
The "ISO mm.stl" files are full cups with correct hole size. The "ISO cup basis.stl" in combination with the " mm tip.stl" files form a complet set of cup with inserts for reduced filament use.
The four different dimensions cover these ranges of viscosity:
3 mm: 4.6-52 cSt
4 mm: 19-163 cSt
6 mm: 84-823 cSt
8 mm: 187-2711 cSt
The formulas for calculating viscosity from the flow time are:
3 mm: V=0.443t-200/t
4 mm: V=1.37t-200/t
6 mm: V=6.90t-570/t
8 mm: V=21.78t-306/t
Where V is kinematic viscosity in cSt (centiStokes) and t is time for cup to empty in seconds.
Please note that you cannot trust the values as these are plastic replicas and true viscosity cups are precision machined from aluminium and stainless steel. It is possible to test the accuracy by using calibration fluids specified in the standard.