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Updated: Feb 14, 2026

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
Published on: January 9, 2017
Particles in Band Saw Coolant: Size Distributions and Implications for Guide Clearances and Friction
Matthias Schmid1, Tobias Tandler2, Hans-Christian Möhring2
1Institute for Fluid Power Drives and Systems, RWTH Aachen University, 52074 Aachen, Germany.
Abstract:
In metal band sawing, higher cutting speeds increase frictional heat at sliding guide blocks. Recirculating water-miscible metalworking fluids (MWFs) often lack fine filtration and accumulate debris that can enter the guide-band interface. A 1 L coolant sample collected after 22.5 m2 of cutting contained a particle load of 0.438 g/L; optical sizing yielded a number-median maximum Feret diameter of 345 µm, with particles up to 1.5 mm. Compared with typical guide clearances (~0.1 mm), these sizes imply frequent ingress/bridging and three-body interactions. The coolant viscosity follows an Andrade relation and decreases by ~2% K-1 around 40 °C. HFRR tribometry indicates low steady-state friction (µ ≈ 0.12), comparable to cutting oil. Together, these results provide quantitative design inputs for next-generation guide clearances and targeted filtration/coolant-delivery concepts in high-speed band sawing.
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