$fn=50;

//#cube([30,30,26], center=true);
nut=30;
thick = 2;
Ra=3;
Ri=1.4;
Rc = 1; // Radius am Center
Wi=19.1; // innere weite
Wl = 8.2; // lichte weite
deep = 9.4;
heigth=25;

difference(){
union(){
translate([-Wl/2, -15,0]) cube([Wl, thick+.1, heigth]);
hull(){
translate([-Wi/2 + Ri, -(nut/2-thick-Ri) ,0]) cylinder(r=Ri, h=heigth);
translate([+Wi/2 - Ri, -(nut/2-thick-Ri) ,0]) cylinder(r=Ri, h=heigth);


translate([-Wl/2 + Rc, -(nut/2-deep+Rc) ,0]) cylinder(r=Ri, h=heigth);
translate([+Wl/2 - Rc, -(nut/2-deep+Rc) ,0]) cylinder(r=Ri, h=heigth);
    

}
    // aussenplatte
 translate([0,-nut/2,heigth/2])   rotate([90,0,0]) cylinder(d=heigth, h=2);
}
translate([0,0,heigth/2]) rotate([90,0,0])cylinder(d=8.1, h = heigth);

}