Print in Place Ball Bearing Torture Test for FDM & Resin Printing

thingiverse

I was curious how well my resin-printer could print a functional print-in-place ball bearing with cylinder-studded elliptical balls, as a prelude to designing my Shimano XT pulleys with integrated bearing by FroggyExact https://www.thingiverse.com/thing:6232986 This design is insprired by best 3D-printable bearing by Bribro12 https://www.thingiverse.com/thing:2349065 I made the design in OnShape: https://cad.onshape.com/documents/63a2b54be5b885f80df26b2d/v/7dd54acf6b8133afc5b59912/e/c702d318c57e505a9ad43905?renderMode=0&uiState=650f0b56d6a06b62b932a548 All dimensions are variable, so the OnShape design can be used to generate every bearing you want. The OnShape design is parametric, and for the posted STLs the following parameters are set, based on a 606 bearing: - Bearing_Height = 6 mm - Inside_Diameter = 6 mm - Vertical_Ellips_Fraction = 0.8 - Outside_Diameter = 17 mm - Number_Bearing_Balls = 11 - Cylinder_Diameter = 1.5 mm - Bearing_Chamfer = 0.25 mm Variable for this set: - One_Sided_Gap = 0.02 - 0.20 mm Calculated: - Half_Angle_between_Balls = (360/#Number_Bearing_Balls/2) deg - Distance_between_Balls = sin(#Half_Angle_between_Balls)*#Balls_Central_Diameter - Bearing_Ball_Diameter = #Distance_between_Balls-#One_Sided_Gap - Balls_Central_Diameter = (#Outside_Diameter+#Inside_Diameter)/2