function cm() {
var wall = angle.wall.value
var angle_rad1 = wall * ((2*Math.PI)/360)
var spring = angle.spring.value
var angle_rad2 = spring * ((2*Math.PI)/360)
var miter = (Math.atan( (Math.sin(angle_rad2) / Math.tan( angle_rad1 / 2 ))))/((2*Math.PI)/360)
var bevel = (Math.asin((Math.cos(angle_rad2) * Math.cos( angle_rad1 / 2))))/((2*Math.PI)/360)
var angle_rev = 90-bevel
angle.miter.value = miter.toFixed(2)
angle.bevel.value = bevel.toFixed(2)
}