The filament drive is a key part of the extrusion assembly Fused Filament Fabrication printer. This investigation examines maximum feed force and slip different driving rollers using made polylactic-acid (PLA) on test stand. stand systematically varies main process parameters: velocity, pinch between rollers, force. has characteristic dependency combined with feed-velocity-dependency, which inf...

The article reports that to improve the functional characteristics of friction drive vertical spindles, it was proposed replace its conventional V-belts with poly-V-belts. Therefore, rollers changed parameters are installed on spindles while maintaining magnitude rolling radius serial rollers. To determine functionality new drive, a stand single spindle drum created, which allows you all perfor...

We develop efficient numerical methods for performing many-body Brownian dynamics simulations of a recently observed fingering instability in an active suspension of colloidal rollers sedimented above a wall [M. Driscoll, B. Delmotte, M. Youssef, S. Sacanna, A. Donev, and P. Chaikin, Nat. Phys. (2016), preprint arXiv:1609.08673. We present a stochastic Adams-Bashforth integrator for the equatio...

The dynamic behaviour of a high speed balanced rotor supported on deep groove ball bearings (SKF-6205) has been studied by numerically simulated results. Since, internal radial clearance (IRC) is inevitably present in all class and types of bearing, in this paper it (IRC-C3) is considered as main source of nonlinearity with speed as control parameter. The complex mathematical model simulates no...

Microneedle rollers have been used to treat large areas of skin for cosmetic purposes and to increase skin permeability for drug delivery. In this study, we introduce a polymer microneedle roller fabricated by inclined rotational UV lithography, replicated by micromolding hydrophobic polylactic acid and hydrophilic carboxy-methyl-cellulose. These microneedles created micron-scale holes in human...