RC Car motor mount in opensacd

General
1

I wish to draw in openscad a motor mount for rc car.
Most of what I need I can do but cannot find a way to draw 3 of 1mm circles each exactly 8.5mm from center of 12 mm radius circle and exactly 120degrees apart.

2

Hi,

I do not know OpenSCAD as I use FreeCAD.

The solution is easy. Draw 1 circle and then use the function “PolarPattern” if that exists in OpenSCAD.

PolarPattern asks you how many circles you want in a certain amount of degrees, eg. in your case that would be 3 circles in 360°.

regards Rainer

3

Did you find a solution for this? I can help with this if you are still in need.

4

Thank you for the offer and yes I would like a solution in openscad.

5

I’m not sure what you mean by circles exactly, but I’m guessing you mean holes, so you might want something like this:

$fn = 30;

eps = 0.001;

height = 2;

difference() {
    cylinder(h = height, r = 12.0, center = true);
    
    translate([8.5, 0, 0])
    cylinder(h = height + eps, d = 1.0, center = true);

    rotate([0, 0, 120])
    translate([8.5, 0, 0])
    cylinder(h = height + eps, d = 1.0, center = true);

    rotate([0, 0, 240])
    translate([8.5, 0, 0])
    cylinder(h = height + eps, d = 1.0, center = true);
}
6

I should mention that this code could be made cleaner, refactored, etc., but I wanted to make the simplest code possible here so that it’s easier to read.

7

Thank you. That does exactly what I wanted.

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