OpenSCAD code to position things in a circular fashion...

CircularPositioning.scad

$fn=100;

distance   = 10;
howMany    = 3;
holeSize   = 10;
startAngle = 30;

difference() {

    translate([0,0,0])
        cylinder(d=40, h=3, center=true);

    for(variable = [startAngle : 360/howMany : 360+startAngle]) {
        
        rotate([0,0,variable])
            translate([distance,0,0])
                cylinder(d=holeSize, h=3.1, center=true);
        
    }
    
}