MOWART - Rear Axis Ball Bearing Calculator

thingiverse

Human: To provide a simple 3 points suspension to the MOWART I wanted to use ball bearings to your project you need to determine the ball bearing radius based on the number of bearing balls and their diameter. For example, with 6mm airsoft balls the following Radii (in mm) are available: Number Ball Center Inner Outer of Balls Angle Radius Radius Radius 4 90.0000 4.2497 1.2447 7.2547 5 72.0000 5.1124 2.1074 8.1174 6 60.0000 6.0100 3.0050 9.0150 7 51.4286 6.9258 3.9208 9.9308 8 45.0000 7.8524 4.8474 10.8574 9 40.0000 8.7860 5.7810 11.7910 10 36.0000 9.7244 6.7194 12.7294 Based on basic trigonometric the below (dimensionless) LUA code calculates Center, Inner and Outer Radius from 4 balls up: function Bearing_Calculator(ball_diameter, max_balls) print("Number\tBall\tCenter\tInner\tOuter") print("Balls\tAngle\tRadius\tRadius\tRadius") for i = 4,max_balls do local angle = 360/i local angle2 = 90 - angle/2 local value=math.cos(math.rad(angle2)) local CR = ball_diameter / value / 2 print(i,string.format("%.4f",angle), string.format("%.4f",CR), string.format("%.4f",CR-ball_diameter/2), string.format("%.4f",CR+ball_diameter/2)) end end Bearing_Calculator(6.01,24) NOTE I used 6.01mm in lieu of 6.00mm to add a little margin, adapt as needed.