function calcd(){
    var form = document.form1;
   
    var r = form.rate.value;
    
    var s = form.speed.value;
	
	var w = form.weight.value;
    
    var d = form.diameter.value;
	
	var e = form.eq.value;
	
	var u = form.used.value;
    
    var sh = form.shale.value;
   
	var Precision=6;
	
	var r1 = (r) / (60 * s);
	var r2 = Math.log(r1);
	var r3 = (12 * w) / (1000 * d);
	var r4 = Math.log(r3);
	var r5 = (r2) / (r4);
	var r6 = (e) / (u);
	var r7 = Math.pow(r6,sh);
	
    var result = r5 * r7;
	


     form.result.value =result.toPrecision(Precision);
    
 return true;
}