#declare Eps = 1E-6;

#declare plattform = 
    union {
	difference {
	    cylinder {
		<0, 0, 0> <0, 180, 0> 1550/2
	    }
	    difference {
		cylinder {
		<0, 18, 0> <0, 162, 0> 1550/2+Eps
		}
		cylinder {
		<0, 18, 0> <0, 162, 0> 1550/2-18
		}
	    }
	    #local i = 0; 
	    #while (i < 27) 
		cylinder {
		    <0, 90, 1550/2-200> <0, 90, 1550/2+Eps>, 72
		    rotate <0, i * 360 / 27, 0>
		}
		#local i = i + 1;
	    #end
	}
	#local i = 0; 
	#while (i < 27) 
	    cylinder {
		<0, 18, 1550/2-18> <0, 162, 1550/2-18>, 18
		rotate <0, (i + 0.5) * 360 / 27, 0>
	    }
	    #local i = i + 1;
	#end
	cylinder {
	    <0, 89, 0> <0, 91, 0> 1550/2
	}
    }