Ball Bearing (Angular Race) (OpenSCAD) (user defined Tolerance)

thingiverse

User parameters: 1. Inner Dia (shaft dia) (Di) 2. Outer Dia (part dia) (Do) 3. Roller Ball Tolerance in mm (printer specific setting) (version 1.0, 1.1: 0.1<Tol<0.5) 4. Overhang Angle of Race (between 45 and 90 degree) (printer specific setting). The overhang angle is between the bearing race and horizontal plane through the intersecting edge of the upper / lower race --------(version 1.0,)------------------- 5. Number of rendering fragments (No). Higher input allows for lower tolerance and better design performance 6. Choice of visual inspection of longitudinal cross section while previewing (In=0: inspection on, In>0 inspection on and general build) -----------(version 1.1)-------------- 7. Chamfering dimensions in mm (0.4<Of<0.8) --------------------------------------------- Method: 1. Number and size of roller balls depend on the Inner / Outer Dia provided by the user 2. Axial thickness of the race depends on the Inner / Outer Dia 3. Radial thickness of the race depends on the Inner / Outer Dia and Overhang Angle provided by user 4. Tolerance provided by user determines the gaps between each roller balls and the race 5. The roller balls are evenly distributed radially along the race of the bearing 6. Simple trigonometric calculations of dimensions and positions 7. Descriptions, comments provided in the (.scad) code as well Render Data: Method: CGAL Geometries in cache: 50 Geometry cache size in bytes: 11844400 CGAL Polyhedrons in cache: 6 CGAL cache size in bytes: 5581856 Total rendering time: 0:14:27.436 Top level object is a 3D object: Simple: yes Vertices: 71384 Half edges: 415568 Edges: 207784 Half facets: 272864 Facets: 136432 Volumes: 17 Note: User parameter checks are not provided (please feel free to experiment in preview before rendering into .stl file Observation: 1. 90 degree angle will make it a rectangular race bearing, but end caps are needed to keep roller balls between the races (please design separately) 2. Less than 45 degree will create gaps in the race thereby separating the top half from the bottom half of both the inner / outer bearing races